| Dissociative Recombination Chemistry and Plasma Dynamics |
16-Jun-2008 |
|
| Authors:
Robert E Continetti; CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF CHEMISTRY
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 | Advances made in the study of the dissociation dynamics and product branching ratios of energized transient neutral molecules formed by charge-transfer (DCE) and recombination of cations with free electrons (DR) are reviewed. The results obtained include detailed measurements of the three-body dissociation of H3, O4 and sym-triazine (HCN)3, as well as the product branching ratios for the two-body dissociation of CM5+ and M30+. These results have significance for a number ... |
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| Operationally Responsive Space (ORS) Architecture for the Year 2025 |
15-Jun-2008 |
109 pages |
| Authors:
K Hansen; M Widmann; B Hatcher; J Kacala; J Rayburn; J Turner; M Senn; S Ledoux; S Kennedy; J Carson; NAVAL POSTGRADUATE SCHOOL MONTEREY CA SPACE SYSTEMS ACADEMIC GROUP
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 | The Unites States' first space systems programs were initially developed to meet the requirements of strategic users. Since the 1991 Gulf War there has been a growing dependence on the capabilities and support delivered by these programs to meet the requirements of nonstrategic users. The current National Security Space (NSS) architecture makes it rather difficult for all but critical strategic users to fully capitalize on the available assets. Timelines that ... |
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| Extending CFD Modeling to Near-Continuum Flows Using Enhanced Thermophysical Modeling |
Mar-2008 |
118 pages |
| Authors:
Abram E Claycomb; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
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| The constitutive relations found in traditional Navier-Stokes-based computational fluid dynamics solvers are known to be limited in altitude. The presence of nonequilibrium phenomena beyond what these methods are able to predict becomes more prevalent at higher altitudes, or increasing Knudsen number. The bulk viscosity, normally assumed to be zero in most computational fluid dynamics applications, is examined as a means of increasing the range of applicability of computational fluid dynamics. ... |
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| Nonequilibrium Hypersonic Aerothermodynamics Using the Direct Simulation Monte Carlo And Navier-Stokes Models |
17-Jan-2008 |
262 pages |
| Authors:
Andrew J Lofthouse; MICHIGAN UNIV ANN ARBOR
|
| Hypersonic flight vehicles are a current topic of interest in both civilian and military research. NASA is currently designing a Crew Transport Vehicle (CTV) [44, 69] and Crew Exploration Vehicle (CEV) [32] to replace the space shuttle; reentry vehicles are, by definition, hypersonic vehicles. Military requirements for reconnaissance and surveillance, as well as the mission of the United States Air Force to rapidly project power globally makes the design of ... |
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| Oscillations in a Forward-Facing Cavity Measured Using Laser-Differential Interferometry in a Hypersonic Quiet Tunnel |
11 DEC 2007 |
151 pages |
| Authors:
Rodrigo Segura; PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS
|
| Laminar-turbulent transition is a pivotal factor for the design of hypersonic vehicles but the mechanisms that induce transition are not well understood. A laser differential interferometer (LDI) is a non-intrusive optical device that measures the optical path length difference between two laser beams. The LDI is a reliable calibrated instrument to assist the study of boundary layer instability-wave growth in hypersonic flow and has high sensitivity and frequency response. An ... |
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| Future of Space Propulsion (Preprint) |
04 SEP 2007 |
29 pages |
| Authors:
John F. Remen; Glenn Liston; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| A lot has happened in the area of space propulsion over the last 10 years prompting one to wonder, "Where are we going next?" This paper will first take a quick look back at history and from this perspective postulate the future directions for space propulsion. Topics to be addressed include spacelift and spacecraft propulsion. The future holds many great opportunities but just as many technical challenges. |
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| Common Aero Vehicle Autonomous Reentry Trajectory Optimization Satisfying Waypoint and No-Fly Zone Constraints |
SEP 2007 |
166 pages |
| Authors:
Timothy R. Jorris; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| To support the Global Strike mission, an autonomous trajectory optimization technique is presented to minimize the flight time, satisfy terminal and intermediate constraints, and remain within the specifed vehicle heating and control limitations. "Waypoints" are specifed for reconnaissance or multiple payload deployments and "no-fy zones" are specifed for geopolitical restrictions or threat avoidance. The Hypersonic Cruise Vehicle (HCV) is used as a simplifed two-dimensional platform to compare multiple solution techniques. ... |
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| FGM (Functionally Graded Material) Thermal Barrier Coatings for Hypersonic Structures - Design and Thermal Structural Analysis |
29 JUN 2007 |
56 pages |
| Authors:
Sook-Ying Ho; Andrei Kotousov; Phuc Nguyen; Steven Harding; John Codrington; Hideaki Tsukamoto; ADELAIDE UNIV (AUSTRALIA) DEPT OF MECHANICAL ENGINEERING
|
| A feasibility study of a relatively simple and economical method for producing functionally graded thermal barrier coatings using the Wet Powder (Slurry) and Sintering method showed promising results. This method is relatively undeveloped and under utilised compared to more expensive techniques such as chemical vapour deposition, physical vapour deposition, plasma spraying and powder metallurgy. It utilizes a pressurized spray gun to spray a slurry mixture of the powdered coating material ... |
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| Conventional Warheads for Long-Range Ballistic Missiles: Background and Issues for Congress |
09 FEB 2007 |
|
| Authors:
Amy F. Woolf; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
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| The United States has deployed long-range ballistic missiles in its strategic offensive nuclear forces for more than 40 years. Recently, some have proposed that the United States deploy conventional warheads on these missiles. This would provide the United States with the ability to strike promptly anywhere in the world, regardless of the presence of overseas bases or nearby naval forces. The Air Force and Navy have both studied the possible ... |
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| Velocity Slip and Temperature Jump in Hypersonic Aerothermodynamics |
11 JAN 2007 |
25 pages |
| Authors:
Andrew J. Lofthouse; MICHIGAN UNIV ANN ARBOR DEPT OF AEROSPACE ENGINEERING
|
| Hypersonic vehicles experience different flow regimes during flight due to changes in atmospheric density. Computational Fluid Dynamics (CFD), while relatively computationally inexpensive, are not physically accurate in areas of highly non-equilibrium flows. The direct simulation Monte Carlo (DSMC) method, while physically accurate for all flow regimes, is relatively computationally expensive. A breakdown parameter can be used to determine where in the flow domain the CFD methods are valid. The current ... |
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| Diode Laser Diagnostics of High Speed Flows (Postprint) |
OCT 2006 |
17 pages |
| Authors:
Skip Williams; Dominic Barone; Todd Barhorst; Kevin Jackson; K. C. Lin; Pat Masterson; Qingchun Zhao; Andrew D. Sappey; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| This document contains the specific requirements and preliminary results for the Optical Mass Capture (OMC) experiment for the Fundamental RESearch Hypersonic Flight experimentation (FRESH Fx) program. The objective of this effort is to develop and demonstrate in flight a diode-laser-based measurement of engine air mass capture in the inlet or isolator of a hypersonic vehicle over an altitude range of 60,000-90,000 ft with an average Mach number of 7.5 over ... |
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| Low Temperature, Low Pressure Fabrication of Ultra High Temperature Ceramics (UHTCs) |
AUG 2006 |
116 pages |
| Authors:
Yigal Blum; Jochen Marschall; Hans J. Kleebe; SRI INTERNATIONAL MENLO PARK CA
|
| The US Air Force is interested in developing fiber-reinforced ceramic composites that perform at ultra-high temperatures (greater or more than 1500 degrees C) under oxidative conditions, especially for hypersonic vehicles. Two potential approaches are: (a) Utilizing existing carbon-fiber-reinforced carbon-matrix composites (C/C) or carbon-fiber-reinforced silicon carbide-matrix composites (C/SiC) coated by thick (>100 um) ultra-high temperature ceramic (UHTC) coatings, or (b) Replacing the C and SiC matrices of such composites with an ... |
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| Conventional Warheads for Long-Range Ballistic Missiles: Background and Issues for Congress |
27 JUN 2006 |
|
| Authors:
Amy F. Woolf; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| The United States has deployed long-range ballistic missiles as a part of its strategic offensive nuclear forces for more than 40 years. In recent years, analysts both inside and outside the government have suggested that the United States deploy conventional warheads on these missiles. This would provide the United States with the ability to strike promptly anywhere in the world, regardless of the presence of overseas bases or nearby naval ... |
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| A Comparative Analysis of Single-Stage-To-Orbit Rocket and Air-Breathing Vehicles |
JUN 2006 |
100 pages |
| Authors:
Benjamin S. Orloff; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| This study compares and contrasts the performance of a variety of rocket and air breathing, single-stage-to-orbit, reusable launch vehicles. Fuels considered include bi-propellant and tri-propellant combinations of hydrogen and hydrocarbon fuels. Astrox Corporation's HySIDE code was used to model the vehicles and predict their characteristics and performance. Vehicle empty mass, wetted area and growth rates were used as figures of merit to predict the procurement, operational and maintenance cost trends ... |
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| Optimal Guidance Command Generation and Tracking for Reusable Launch Vehicle Reentry (Preprint) |
JUN 2006 |
26 pages |
| Authors:
Kevin P. Bollino; Michael W. Oppenheimer; David B. Doman; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL AND ASTRONAUTICAL ENGINEERING
|
| The objective of this work is to develop a robust guidance and control architecture for autonomous reusable launch vehicles that incorporates elements of recent advances in the areas of optimal trajectory generation and reconfigurable control. This work integrates three separately developed methods to form a coherent architecture with the potential to manage control effector failures, vehicle structural/aerodynamic degradation, uncertainty, and external disturbances. Outer-loop guidance commands in the form of body-frame ... |
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| The Use of Exergy and Decomposition Techniques in the Development of Generic Analysis, and Optimization Methodologies Applicable to the Synthesis/Design of Aircraft/Aerospace Systems |
21 APR 2006 |
73 pages |
| Authors:
Michael R. von Spakovsky; Vijayanand Periannan; Kyle C. Markell; Keith M. Brewer; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF MECHANICAL ENGINEERING
|
| In M.S. thesis #1, advantages of applying exergy-based analysis and optimization methods to the synthesis/design and operation of aircraft systems is demonstrated using a supersonic aircraft fighter flown over an entire mission. A first set of optimizations involving four objectives (two energy-based and two exergy-based) are performed with only propulsion and environmental control subsystem degrees of freedom. Losses for the airframe subsystem are not incorporated into the two exergy-based objectives. ... |
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| Assessing the Potential for Improved Scramjet Performance Through Application of Electromagnetic Flow Control |
23 MAR 2006 |
176 pages |
| Authors:
Martin F. Lindsey; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Hypersonic flight using scramjet propulsion bridges the gap between turbojets and rockets. Recent efforts focus on magnetogasdynamic (MGD) flow control to mitigate the problems of high thermomechanical loads and low efficiencies associated with scramjets. This research is the first flight-scale, three-dimensional computational analysis of a realistic scramjet to assess how MGD flow control improves scramjet performance. Developing a quasi-one dimensional design tool culminated in the first open source scramjet geometry. ... |
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| Conventional Warheads for Long-Range Ballistic Missiles: Background and Issues for Congress |
13 MAR 2006 |
|
| Authors:
Amy F. Woolf; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| The United States has deployed long-range ballistic missiles as a part of its strategic offensive nuclear forces for more than 40 years. In recent years, analysts both inside and outside the government have suggested that the United States deploy conventional warheads on these missiles. This would provide the United States with the ability to strike promptly anywhere in the world, regardless of the presence of overseas bases or nearby naval ... |
|
| Comparative Analysis of Two-Stage-to-Orbit Rocket and Airbreathing Reusable Launch Vehicles for Military Applications |
MAR 2006 |
254 pages |
| Authors:
Joseph M. Hank; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The Department of Defense (DoD) has identified operationally responsive, low-cost access to space as vital to maintaining U.S. military supremacy. Reusable Launch Vehicles (RLVs) will allow the U.S. to keep a technological advantage over our adversaries, and advances in airbreathing propulsion technology have made it feasible for use in space launch vehicles. This study considers two-stage-to-orbit (TSTO) RLV configurations, each using combinations of propulsion including pure rocket, pure turbine, rocket-based-combined-cycle ... |
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| CFD Validation for Hypersonic Flight: Real Gas Flows |
01 JAN 2006 |
11 pages |
| Authors:
Graham V. Candler; Ioannis Nompelis; MINNESOTA UNIV MINNEAPOLIS DEPT OF AEROSPACE ENGINEERING AND MECHANICS
|
| The aerodynamics of future hypersonic air-breathing vehicles will be greatly affected by high-enthalpy or "real gas" effects. It is the purpose of a recent NATO Research and Technology Organization study to assess the readiness of computational fluid dynamics to simulate high-enthalpy flows. This paper summarizes the results of this effort through the discussion of four test cases: a transverse cylinder, shock-shock interactions, blunt double-cones, and a large blunt cone-flare. The ... |
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| Integrated Hypersonic Aerothermoelastic Methodology for Trans Atmospheric Vehicle (TAV)/Thermal Protection System (TPS) Structural Design and Optimization. Thermal Protection System Optimization (TPSOPT) |
JAN 2006 |
244 pages |
| Authors:
P. C. Chen; Xiaowei W. Gao; K. T. Chang; ZONA TECHNOLOGY INC SCOTTSDALE AZ
|
| This report was developed under a SBIR contract. The objective of this project was to develop a hypersonic aerothermoelastic methodology that optimizes the Thermal Protection System (TPS) for the Trans Atmospheric Vehicles (TAV) in the re-entry/maneuver flight phases. The outcome of this project is a Thermal Protection System Optimization (TPSOPT) software system that integrates multiple disciplines, including the hypersonic aerodynamics, aerothermodynamics, heat transfer, aeroelasticity, with an automatic optimization technique for ... |
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| Control of an Unstable, Nonminimum Phase Hypersonic Vehicle |
OCT 2005 |
21 pages |
| Authors:
Michael W. Oppenheimer; David E. Doman; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
|
| In this work, a control law for an unstable, nonminimum phase model of a hypersonic vehicle is developed. The control problem is difficult due to the locations of the plant poles and zeros. For an unstable system, feedback is required to stabilize the plant. However, one cannot make the loop gains arbitrarily large without driving one or more of the closed-loop poles into the right-half of the s-plane, since the ... |
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| Aeroelasticity, Aerothermoelasticity and Aeroelastic Scaling of Hypersonic Vehicles |
DEC 2004 |
21 pages |
| Authors:
Peretz P. Freidmann; Kenneth G. Powell; MICHIGAN UNIV ANN ARBOR DEPT OF AEROSPACE ENGINEERING
|
| This final report describes the work during the period of the grant. Three separate hypersonic aeroelastic stability problems were considered: (a) a typical cross section having a double wedge airfoil, (b) the stability of a low aspect ratio wing, also with a double wedge airfoil, and (c) the behavior of a complete generic hypersonic vehicle. For problems (a) the unsteady airloads were computed using third order piston theory, as well ... |
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| Oxidation and Catalytic Efficiency of ZrB2 and HfB2 Based Ultra-High- Temperature Ceramic (UHTC) Composites Exposed to Supersonic Air Plasma |
SEP 2004 |
64 pages |
| Authors:
Jochen Marschall; SRI INTERNATIONAL MENLO PARK CA MOLECULAR PHYSICS LAB
|
| This report summarizes the activities and results of experimental and modeling activities performed for the Air Force Office of Scientific Research (AFOSR) under Contract F49620-01-C-0026, "Oxidation and Catalytic Efficiency of ZrB2 and HfB2 Based Ultra-High-Temperature Ceramic (UHTC) Composites Exposed to Supersonic Air Plasma." The goals of this project were to (1) experimentally investigate UHTC oxidation in a supersonic oxidizing flow environment, (2) develop oxidation models that could be incorporated into ... |
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| Physics and Chemistry of MW Discharge in Gas Flows |
21 JUL 2004 |
267 pages |
| Authors:
Yury F. Kolesnichenko; MOSCOW TECHNICAL CO (RUSSIA)
|
| There is a growing interest in the general area of Plasma aerodynamics. The purpose of this activity is to create, in a supersonic flow (up to Mach 2) and in the presence of magnetic field by means of MW and RF techniques, the discharges of different structure with full scale of electron concentration. The contractor will investigate the behavior and interaction of these discharges with shock waves under different (up ... |
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| Numerical Computation in MagnetoFluid Dynamics |
30 JUN 2004 |
30 pages |
| Authors:
R. W. MacCormack; STANFORD UNIV CA DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| During the years supported by the subject AFOSR grant the following research accomplishments were made. Inclusion of both thermal and chemical non- equilibrium into the MFD equations. Simulation of the flow within MFD generators and accelerators for the proposed energy "bypass scram jet engine" concept. Reformulating the governing MFD equations for strong imposed magnetic fields, of the order of 10 Tesla, using the properties of the imposed magnetic fields, V. ... |
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| Performance Enhancement of High Speed Inlets using MHD |
30 MAR 2004 |
84 pages |
| Authors:
Shashi Aithal; Ramakanth Munipalli; Vijaya Shankar; HYPERCOMP INC WESTLAKE VILLAGE CA
|
| HyPerComp is developing advanced computational tools to model high speed flows with MHD effects. Unstructured, multi-dimensional hypersonic MHD codes have been developed at HyPerComp to study supersonic viscous flows in a self-consistent, fully coupled manner. Effects of thermal, chemical and internal mode dis-equilibrium with and without the presence of electro-magnetic fields have been included in these codes. An existing parallel code environment using generalized mesh structure (prisms, tetrahedra, etc.) developed ... |
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| MHD Turbulence at Moderate Magnetic Raynolds Number |
24 MAR 2004 |
12 pages |
| Authors:
B. Knaepen; S. Kassinos; D. Carati; UNIVERSITE LIBRE DE BRUXELLES (BELGIUM)STATISTICAL AND PLASMA PHYSICS
|
| Magnetohydrodynamics applies to many conductive fluid and plasma flows encountered in nature and in industrial applications. In numerous circumstances, the flow is subject to a strong mean magnetic field. This happens in the earth's liquid core and is ubiquitous in solar physics for topics like sunspots, solar flares, solar corona, solar wind etc. Mean magnetic fields play an important role on even larger scales, for instance in the dynamics of ... |
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| Particle Computations of Hypersonic Shock Interaction Flows |
MAR 2004 |
7 pages |
| Authors:
Iain D. Boyd; MICHIGAN UNIV ANN ARBOR DEPT OF AEROSPACE ENGINEERING
|
| Development is described of a hybrid DSMC/CFD code for physically accurate and numerically efficient computation of hypersonic, viscous- interaction flows. Recent studies focus on the application and assessment of a hybrid code to a blunted cone configuration and to improvement of physical models used in the code. |
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| Trajectory Generation Using a Modified Simple Shooting Method |
FEB 2004 |
9 pages |
| Authors:
Ashley Trent; Ram Venkataraman; DAvid Doman; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
|
| Recently, several authors have studied the problem of trajectory redesign for hypersonic aircraft. The usual procedure for solving such problems is to set it up as a constrained optimal control problem. Lu and Schierman used direct methods to numerically solve the optimal control problems. Alternatively, one could use Pontryagin's Minimum Principle to obtain first-order necessary conditions for the optimal control problem and obtain a two-point boundary-value problem (TPBVP). Originally created ... |
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| Localized Flow Control in High Speed Flows Using Laser Energy Deposition |
30 NOV 2003 |
25 pages |
| Authors:
Doyle D. Knight; Hong Yan; Greg Elliott; Graham Candler; Alexander Zheltovodov; RUTGERS - THE STATE UNIV PISCATAWAY NJDEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| The capability for localized flow control in high speed flows using laser energy deposition has been investigated in a collaborative computational and experimental program. Three proposed applications have been comprehensively studied. First, two models of laser energy deposition in air have been developed and validated by comparison with experiment. The first model is an engineering approach wherein the laser energy deposition is treated as an energy release in a perfect ... |
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| Numerical Research of Capabilities of Flat Thermochemical Reactor as Element of a Hypersonic Flight Vehicle Heat Protection |
20 OCT 2003 |
12 pages |
| Authors:
V. K. Vasilyev; A. V. Korabelnikov; A. V. Fedotov; AKADEMIYA NAUK SSSR MOSCOW
|
| Thermal protection of heat-stressed surfaces of a hypersonic flight vehicle (HFV) flying in dense layers of atmosphere with hypersonic velocities (M greater than or equal 7) is now one of the most actual problems 1,2. In HFV developed under the "Ajax" concept it is supposed that in the most heat- stressed parts of a skin and engine the chemical catalytic reactors will be placed in which the high endothermic processes ... |
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| DNS Studies of Transitional Hypersonic Reacting Flows Over 3-D hypersonic Vehicles |
05 MAR 2003 |
54 pages |
| Authors:
Xiaolin Zhong; CALIFORNIA UNIV LOS ANGELES DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| The objectives of this research project are to develop CFD techniques and to conduct DNS studies of fundamental flow physics leading to boundary-layer instability and transition in hypersonic flows During the three-year period, we have conducted extensive DNS studies on the receptivity of a supersonic boundary layer over a blunt cone, and over both sharp and blunt leading edge; and on the receptivity of the Goertler vortices. DNS studies were ... |
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| Near Net-Shape Ultra-High Melting Recession-Resistant Rocket Nozzles II: Low Cost Carbon-Carbon Technology for Use in Ultra-High Temperature Oxidative Environments |
2003 |
20 pages |
| Authors:
W. P. Hoffman; P. G. Wapner; P. J. Wurm; J. R. Schorr; K. H. Sandage; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Carbon-carbon composites are ideal materials for high temperature structural uses, such as in rocket propulsion components, hypersonic vehicles, and aircraft brakes. In spite of their excellent properties, the use of carbon- carbon composites has been limited because of their high cost and rapid oxidation at elevated temperatures. Two novel approaches to solving these problems are described and these approaches are employed along with a ZrC/W- based nozzle insert to fabricate ... |
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| In Situ Densification Utilizing a Low-Viscosity Wetting Impregnant that Greating Reduces Processing Time to Produce Uniform Density Carbon-Carbon Composites |
JUL 2002 |
5 pages |
| Authors:
Wesley Hoffman; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST
|
| High-performance carbon-carbon (C-C) composites possess a unique set of properties that make them desirable materials for high-temperature structural uses such as in rocket propulsion components, hypersonic vehicles, and aircraft brakes. They are stronger and stiffer than steel and less dense than aluminum. In a non-oxidizing environment they maintain their mechanical properties to temperatures above 3000 deg C. In addition, their properties actually improve with heating as the non-ordered carbon is ... |
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| Reactions of Energetic Ions with Thin Film Surfaces |
28 JUN 2002 |
10 pages |
| Authors:
Dennis C. Jacobs; NOTRE DAME UNIV IN DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| The PI has designed and constructed a multi function vacuum chamber for evaporating metal films and depositing insulating layers. The chamber is to be used for fabricating metal-insulator-metal (M-I-M) devices that function as novel solid-state electron emitters. Nanoscale M-I-M devices deliver hot electrons to the metal/vacuum interface from within the solid. These hot electrons can stimulate nonthermal chemical reactions at the gas/surface interface or supplement the charge density of a ... |
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| Integrated Hypersonic Aerothermoelastic Methodology for Transatmospheric Vehicle (TAV)/Thermal Protection System (TPS) Structural Design and Optimization |
JAN 2002 |
120 pages |
| Authors:
D. D. Liu; P. C. Chen; Lei Tang; K. T. Chang; Adel Chemaly; ZONA TECHNOLOGY INC SCOTTSDALE AZ
|
| The adaptation of ZONA unified hypersonic/supersonic method ZONA7U and its integration/development into a ZONA aerothermoelastic software system for transatmospheric vehicle (TAV)/thermal protection system (TPS) design/ analysis was proven a successful tool through feasibility study with cases of a CKEM body, blunt cones, and a modeled X-34 wing body. Preceding the feasibility study, substantial effort was directed toward further development of a new code, ZSTREAM, and using it and ZABRO to ... |
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| Experimental Study of Stability and Transition of Hypersonic Boundary Layer Around Blunted Cone |
DEC 2001 |
71 pages |
| Authors:
Anatoly A. Maslov; RUSSIAN ACADEMY OF SCIENCES NOVOSIBIRSK INST OF THEORETICAL AND APPLIED MECHANICS
|
| The objective of this project is to basic research of stability and transition of hypersonic boundary layer around blunted cone. Next results is obtained: -experimental data on the position of the laminar-turbulent transition in the boundary layer of a cone with different nose bluntness for Mach 6; - experimental data on the characteristics of natural disturbances in the hypersonic boundary layer of a blunted cone for Mach 6; -experimental data ... |
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| Hypersonic Maneuvering Vehicle Simulations Using Real-Gas, Unstructured Navier-Stokes Software |
14 NOV 2001 |
51 pages |
| Authors:
William D. McGrory; AEROSOFT INC BLACKSBURG VA
|
| Hypersonic vehicles are becoming more of a reality with the current level of technology. Concept vehicles are now being made in order to test the most recent advances in hypersonic technology. Along with models for flight testing, CFD has become an important role in the development of modern hypersonic vehicles. The technology in CFD is making more complex configurations and flow-fields available for simulation. One of the advances in CFD ... |
|
| Fifteenth International Symposium on Air Breathing Engines |
SEP 2001 |
|
| Authors:
Paul J. Waltrup; AMERICAN INST OF AERONAUTICS AND ASTRONAUTICS RESTON VA
|
| The 15th International Symposium on Air Breathing Engines (XV ISABE) was held at Bangalore, India on September 2-7, 2001, organized by the Indian National Organizing Committee under the sponsorship of various professional organizations across the world, various industries and academic institutions in India, and the governmental authorities in India. The symposium was also supported by various agencies of the U.S. government including the Department of Defense and the National Aeronautics ... |
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| (Proceedings from the) Fifteenth International Symposium on Air Breathing Engines (XV ISABE), held 3-7 September 2001, Bangalore, India. Papers and Supplement to the Proceedings (CD-ROM) |
SEP 2001 |
|
| Authors:
Paul J. Waltrup; AMERICAN INST OF AERONAUTICS AND ASTRONAUTICS RESTON VA
|
| ELECTRONIC FILE CHARACTERISTICS: 273 text and software files; Adobe Acrobat PDF and Ver. 4.0 software. PHYSICAL DESCRIPTION: 2 computer laser optical discs (CD-ROM); 4 3/4 in. ea.; 531 and 38.5 MB ea. SYSTEMS DETAIL NOTE: Requires reinstallation of Adobe Acrobat to ensure search capabilities. ABSTRACT: The Fifteenth International Symposium on Airbreathing Engines (XV ISABE) was held at Bangalore, India, during September 2-7, 2001, organized by the Indian National Organizing Committee, ... |
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| Adaptive Guidance Systems for Hypersonic Reusable Launch Vehicles |
2001 |
13 pages |
| Authors:
John D. Schierman; David G. Ward; Jason R. Hull; Jeffrey F. Monaco; Michael J. Ruth; BARRON ASSOCIATES INC CHARLOTTESVILLE VA
|
| This paper presents an adaptive guidance system approach applied to hypersonic Reusable Launch Vehicles (RLVs). After an effector failure, it is assumed that the inner-closed-loop system utilizes a reconfigurable control algorithm to recover nominal maneuvering capabilities to the extent possible. However, nominal performance will typically not be fully recovered for RLVs, and the outer-loop guidance system must account for the degraded vehicle response. Two main approaches for the adaptive guidance ... |
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| Investigation of Combined Low-Angled Jets and Variable Wall Geometry forHypersonic Aerodynamic Control |
30 NOV 2000 |
119 pages |
| Authors:
Rodney D. Bowersox; Huaiguo Fan; ALABAMA UNIV TUSCALOOSA DEPT OF AEROSPACE ENGINEERING AND MECHANICS
|
| A comprehensive investigation of the use of low-angled jets to control the aerodynamic forces, viscous drag, and heat transfer for hypersonic vehicles was performed. The research program was divided into two thrusts. The first thrust involved construction of a new experimental hypersonic research laboratory. The laboratory houses two wind tunnels (a Mach 5.0 blow-down and a Mach 7.0 shock tunnel) developed as part of this ... |
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| DNS and Linear Stability Analyses of Unsteady 3-D Hypersonic Wall- Bounded Flows with Real-Gas Effects |
02 JUN 2000 |
35 pages |
| Authors:
Xiaolin Zhong; CALIFORNIA UNIV LOS ANGELES DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| The goal of this research project is to develop new advanced numerical methods and to perform DNS studies of transient hypersonic reacting flows over full 3-D maneuvering vehicles. The DNS tools and supporting theoretical approaches are used to gain new fundamental understanding of transition phenomena of 3-D chemically-reacting hypersonic boundary layers. In the three-year period, significant progress has been made in the DNS of ... |
|
| Chemical Propulsion Information Agency Bulletin, Volume 26, Number 3. The JHU Applied Physics Laboratory Continues a Long History of Propulsion Research |
MAY 2000 |
10 pages |
| Authors:
CHEMICAL PROPULSION INFORMATION AGENCY LAUREL MD
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| The Johns Hopkins University Applied Physics Laboratory (JHU/APL) has been involved with rocket and missile propulsion as a technology developer, as an evaluator of propulsion technology, and as a user of propulsion units for over fifty years. JHU/APL has been at the forefront of research and development in ramjet scramjet, and mixed-cycle air-breathing propulsion systems since 1944, with the development and first successful flight test of a ... |
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| EUROGRAM, no. 00-01, Jan-Feb 2000. European Office of Aerospace Researchand Development |
FEB 2000 |
13 pages |
| Authors:
EUROPEAN OFFICE OF AEROSPACE RESEARCH AND DEVELOPMENT FPO NEW YORK 09510
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| 14TH International Symposium on Air-Breathing Engines (XIV ISABE). Papers (CD-ROM) |
11 SEP 1999 |
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| Authors:
FLORENCE UNIV (ITALY)
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| ELECTRONIC FILE CHARACTERISTICS: 384 files; hyperlinked PDF document and Adobe Acrobat software. PHYSICAL DESCRIPTION: 1 computer laser optical disc; 4 3/4 in.; 346MB. SYSTEMS DETAIL NOTE: Requires CD-ROM drive. ABSTRACT: The Final Proceedings for 14th International Symposium on Air-Breathing Engines (XIV ISABE), 5 September 1999 - 10 September 1999. All aspects of Air-Breathing engines will be covered such as Science, Engineering, Manufacturing, Testing, Cost and Business, and Technologies, including Fuels ... |
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| Multi-Spectral Shocklayer Radiance from a Hypersonic Slender |
1999 |
15 pages |
| Authors:
Deborah A. Levin; David M. Mann; Clifton B. Phillips; Mike Lovern; Carl Howlett; GEORGE WASHINGTON UNIV WASHINGTON DC
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| The Science and Technology Directorate of the Ballistic Missile Defense Organization is conducting programs to characterize and measure the radiation emitted by the flows about hypersonic vehicles. In addition to understanding the basic physics of high temperature plasmas, ongoing analyses are establishing how such emissions are useful for the detection of theater missile targets using the mid-wave infra-red (MWIR) spectral region (3 - 5 ... |
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| Hypersonic Missile Propulsion System |
NOV 1998 |
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| Authors:
Richard R. Kazmar; PRATT AND WHITNEY WEST PALM BEACH FL
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| Pratt & Whitney is developing the technology for hypersonic components and engines. A supersonic combustion ramjet (scramjet) database was developed using hydrogen fueled propulsion systems for space access vehicles and serves as a point of departure for the current development of hydrocarbon scramjets. The Air Force Hypersonic Technology (HyTech) Program has put programs in place to develop the technologies necessary to demonstrate the operability, performance and ... |
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| Information Access of Approach Navigation for Nonlinear Autonomous Systems |
04 MAR 1998 |
6 pages |
| Authors:
Bjorn Jawerth; SUMMUS LTD IRMO SC
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| This initial phase of the effort is focused on developing and understanding appropriate definitions, and related tools and methods, applicable to the problem of identifying, classifying, tracking, and acting on visual information, potentially aided by physical information, in highly dynamic environments. We focus on defining elemental aspects of shape, shape evolution, and methods for representing and sampling visual information spaces. Our approach to defining these elemental aspects focuses on identifying ... |
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Reports by Keyword(s)
HYPERSONIC VEHICLES
