| Digital Flight Control Research Using Microprocessor Technology. |
MAY 1979 |
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| Authors:
Robert F. Stengel; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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| A Study of Longitudinal Controllability and Stability Requirements for Small General Aviation Airplanes. |
03 AUG 1978 |
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| Authors:
David R. Ellis; Cornelius L. Griffith; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
 | Several aspects of small airplane longitudinal stability and control were examined by means of analysis and in-flight simulation experiments. The influence of various levels of static stability in the context of approach, landing, and climb tasks was studied, with particular emphasis on the effects of force gradient augmentation by means of downsprings. Cases in which spring force varied with elevator deflection or with angle of attack were considered in addition ... |
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| Solid Propellant Combustion Mechanism Research. 1977-1978. Annual Report. |
APR 1978 |
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| Authors:
L. H. Caveny; M. BenReuven; J. Bellan; M. Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The combustion processes of solid propellants and rocket chamber Flows are being analyzed in terms of more complete flame models and fluid dynamics models. The flame structure, surface processes, and liquid layer decomposition of a cyclic nitramine (e.g., RDX) have been modeled. The model includes the partial decomposition of the nitramine molecule in the liquid phase, surface gasification, gas phase decomposition, and oxidation of formaldehyde. Several propellants (e.g., nitramine composite ... |
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| Numerical Calculation of Variable Property Flows in Curvilinear Orthogonal Coordinates |
FEB 1978 |
|
| Authors:
Joseph A. C. Humphrey; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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| In an earlier communication (dealing with flow in curved pipes) a numerical procedure capable of calculating variable property flows in arbitrary curvilinear orthogonal coordinates was reported. Convective and diffusive base vector variation source terms appearing in the differential momentum equation were tabulated but their derivation was not described. In addition, and because of the cases studied, only brief mention was made with regard to the extra source terms arising in ... |
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| A Study of the Precision Hover Capabilities of the Aerocrane Hybrid Heavy Lift Vehicle. |
FEB 1978 |
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| Authors:
H. C. Curtiss Jr.; W. F. Putman; R. M. McKillip Jr; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| An analytical study of the precision hover capabilities of the AEROCRANE, based on equations of motion verified by flight tests of a dynamic model, is described. Two methods of control (cyclic pitch and winglets) are examined. A real time simulation of the tasks of hovering a proposed large AEROCRANE in gusts and translating from point to point was conducted to evaluate the two control methods and to compare the AEROCRANE ... |
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| Radiation Effects on MOS/SOS Semiconductor Devices. |
31 JAN 1978 |
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| Authors:
B. S. H. Royce; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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| Measurements have been made on radiation induced leakage currents in MOS/SOS structures and the effects of optical bleaching and further irradiation under zero bias conditions have been studied. In order to understand the role played by bulk traps in Al2O3 in the radiation induced leakage currents and to identify the possible lattice defects associated with these traps. Thermally Stimulated Current Techniques have been employed. Optical bleaching and trap repopulation studies ... |
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| High Pressure Burning Rates of Multi-Base Propellants. |
DEC 1977 |
75 pages |
| Authors:
L. H. Caveny; L. M. Pokrocos; C. R. Felsheim; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
 | Burning rates of multi-base, nitrocellulose propellants at high pressure were measured using recently developed techniques. Since the intended application is in-process control, as-manufactured multi-perforated grains (finished as well as interrupted-process propellants) are used. Chamber pressurization to 345 MPa (50,000 psi) is achieved using a hydraulic pump, rather than by nitrogen intensifier systems; the burning interval is determined by timing either the period of acoustic emission or pressure rise. Burning rate ... |
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| Oxidation Kinetics of Hydrocarbon Fuels. |
DEC 1977 |
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| Authors:
Irvin Glassman; Frederick L. Dryer; Robert J. Santoro; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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| This report discusses interim results on the elucidation of high temperature oxidation kinetics of hydrocarbon fuels through experimental studies in a turbulent flow reactor. The report details current results particularly on ethane oxidation. Also discussed are results of an exploratory study of low pressure metal/oxidizer flame systems as a source of chemical laser action. (Author) |
|
| Erosive Effects of Various Pure and Combustion-Generated Gases on Metals. Part II. |
OCT 1977 |
|
| Authors:
A. C. Alkidas; S. O. Morris; C. W. Christoe; L. H. Caveny; M. Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| This study continues the experimental investigation of the thermal and chemical erosion characteristics of steel alloys which were begun under Contract DAAG46-72-C-0078. The high pressure (approx. 3 kbars) and high temperature (approx. 3000 K) environment to which the steel specimens are subjected is produced by a ballistic compressor and by a solid propellant combustor. Equilibrium thermochemical calculations of the possible reactions indicate that the most probable reaction products are oxides, ... |
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| Three-Dimensional Shock Wave Turbulent Boundary Layer Interactions. A Preliminary Analysis of Blunted Fin-Induced Flows. |
OCT 1977 |
|
| Authors:
David S. Dolling; Charles D. Cosad; Seymour M. Bogdonoff; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| An extensive experimental investigation has been made of three-dimensional blunted fin-induced shock wave turbulent boundary layer interactions. Surface pressures, heat transfer rate distributions and oil streak patterns were obtained over a range of fin bluntnesses and incidences for two different incoming boundary layers. These incoming boundary layers had mean thicknesses in the ratio of approximately 4:1. Preliminary analysis of these data indicates that, over a large region of the interaction, ... |
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| Combustion Chemistry of Chain Hydrocarbons |
SEP 1977 |
63 pages |
| Authors:
Frederick L. Dryer; Irvin Glassman; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The current understanding of the combustion chemistry of paraffin hydrocarbons is summarized. Emphasis is placed on reviewing the semiempirical methods presently available for modelling alkyl hydrocarbon combustion. The anomalies inherent in some of the existing models and approaches to improve both qualitative and quantitative predictive capabilities are discussed. Modelling alkane combustion chemistry over extended ranges of equivalence ratio, pressure, and temperature, requires the consideration of sequential but partially overlapping processes: ... |
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| An Experimental and Analytical Investigation of the Hovering and Forward Flight Characteristics of the Aerocrane Hybrid Heavy Lift Vehicle. |
SEP 1977 |
132 pages |
| Authors:
W. F. Putman; H. C. Curtiss Jr; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| Results of an analytical and experimental investigation of an AEROCRANE hybrid heavy lift vehicle are discussed. The experimental program involved free-flight investigations of the trim and dynamic stability characteristics of the AEROCRANE in hovering and forward flight using a Froude-scaled model. The effects of a simple feedback system on the dynamic stability of the model and the ability of a remote pilot to control the model are discussed. Analytical predictions ... |
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| A Theoretical Analysis of Nonlinear Effects on the Flutter and Divergence of a Tube Conveying Fluid |
02 AUG 1977 |
|
| Authors:
Enoch Ch'ng; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| A theoretical model capable of describing the flutter and divergence of a tube conveying high velocity fluid is developed in this study. The nonlinear effect due to tension induced by bending is considered along with other linear forces. The partial differential equations by Galerkin's method and the time histories of the tube motion are evaluated numerically. Numerical results for the thresholds of flutter instability and the mode shapes of a ... |
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| Experimental and Modeling Studies of Smoldering in Flexible Polyurethanes. |
15 JUL 1977 |
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| Authors:
T. J. Ohlemiller ; F. E. Rogers ; A. Kurtz ; J. Bellan ; M. Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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| The fire safety hazard posed by smoldering combustion of open cell flexible polyurethane-based cushioning materials is discussed. The goal is a sufficient understanding of the thermophysics and chemistry of this process to permit construction of a predicitive mathematical description of it. The complex degradation chemistry occuring in a polyurethane during smolder can, with the help of thermal analysis (TGA and DSC) be reduced to a simple scheme of overall reactions. ... |
|
| Anharmonic Oscillator Lasers. |
JUL 1977 |
|
| Authors:
J. A. Smith; S. H. Lam; G. K. Bienkowski; R. B. Miles; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| Emphasis of the work performed under this contract has been placed on fundamental theoretical and experimental studies of various phenomena associated with diatomic molecular gas flows in which anharmonicity plays an important role in producing or maintaining an inversion which is suitable for lasing. Most of the work concerned carbon monoxide gas dynamic or electrically excited flows because these systems were capable of being studied in our laboratories, had considerable ... |
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| The Concept of an Unmanned Transatlantic Sailing Buoy (NOAA's ARK) |
MAY 1977 |
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| Authors:
T. E. Sweeney; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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| Recently, the marine science community has become interested in a transatlantic data scan by a moving or sailing buoy capable of making good a prescribed course within reasonable tolerances and also capable of acquiring and transmitting significant data on a short time interval. This report examines the problems involved and proposes the design of an unmanned sailing vessel, sensors and transmitters capable of accomplishing these tasks. |
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| A Helicopter Simulator Study of Control Display Tradeoffs in a Decelerating Approach. |
MAY 1977 |
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| Authors:
James Craig Adamson; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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| A total force nonlinear analog model of the UH-1 helicopter was developed which simulates the entire low speed flight envelope from hover to 60 knots. Classical multiloop control theory was applied to design five levels of automatic stabilization which were used as test variables along the control axis of the test matrix. An integrated display was used which superimposes analog symbology over a terrain image. The basic display format, which ... |
|
| Compilation of Abstracts - 1977 AFOSR Contractors Meeting on Combustion and Plume Kinetics, 4-5 April 1977. |
APR 1977 |
|
| Authors:
PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| This report is a collection of the abstracts of talks by contractors and grantees of the Air Force Office of Scientific Research (AFOSR) in the area of chemical kinetics related to combustion, plume and wake technologies at a meeting held at the Arnold Air Force Station, Arnold Engineering Center, Tullahoma, Tennessee, April 4, 5, 1977. (Author) |
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| Research on Noise Generated by Ducted Air-Fuel Combustion Systems. |
MAR 1977 |
|
| Authors:
E. G. Plett; M. Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| Throughout the research program, emphasis has been placed on obtaining a better understanding of the importance of combustion as a source of noise in jet engines. This has been pursued in terms of theoretical modeling and experimental investigations. A theoretical model was developed to allow computation of the role internal sources as well as external sources. Calculations based on reasonable approximations indicated that for subsonic jet velocities, internal sources could ... |
|
| Propellant Combustion and Propulsion: Nine Year Index and Abstracts of Publications by Princeton University 1968 - 1976 |
DEC 1976 |
|
| Authors:
PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
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| Solid Propellant Ignition and Unsteady Combustion Processes. |
NOV 1976 |
|
| Authors:
Leonard H. Caveny; Martin Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The research carried out under the grant was aimed at furthering the scientific understanding of nonsteady propellant combustion behavior in rocket motor chambers. Controlled nonsteady flow and burning conditions were produced in laboratory-scale solid rocket motors by developing a device that modulated the throat area of the primary nozzle. Modulation frequencies up to 2400 Hz were obtained. The modulated throat rocket motor is being used to acquire data using AP ... |
|
| Oxidation Kinetics of Hydrocarbon Fuels. |
SEP 1976 |
|
| Authors:
Irvin Glassman; Frederick L. Dryer; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| This report discusses interim results on the elucidation of high temperature oxidation kinetics of hydrocarbon fuels through experimental studies in a turbulent flow reactor. The report details current results particularly on ethane oxidation. Also discussed are results of an exploratory study of low pressure metal/oxidizer flame systems as a source of chemical laser action. (Author) |
|
| Nucleation at a Liquid-Liquid Interface and Exploding Drops in Emulsified Fuel Combustion |
JUL 1976 |
|
| Authors:
C. T. Avedisian; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| This progress report gives some preliminary observations of the exploding drop phenomenon which sometimes occurs during burning of emulsified fuels. It contains what may be considered a first attempt at explaining the so- called micro-explosin effect which has been observed in the burning of such fuels. The purpose of this work was twofold: 1) to offer an explanation for the droplet explosion effect and thereby predict the temperature at which ... |
|
| Research on Hypersonic Aerodynamics. |
05 MAY 1976 |
|
| Authors:
S. M. Bogdonoff; F. R. Hama; S. H. Lam; J. A. Smith; I. E. Vas; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The theoretical and experimental studies carried out by the Gas Dynamics Laboratory as part of its long range research in hypersonic flows have been summarized for the period 1 January 1971-31 December 1975. These studies provide some fundamental and some practical insights into real flow phenomenon observed in nature and in flight. Some of the studies have been completed, others require further work to fully understand them or to limit ... |
|
| IMPACT OF COMPOSITE PLATES: ANALYSIS OF STRESSES AND FORCES |
JAN 76 |
|
| Authors:
F. C. Moon; B. S. Kim; S. R. Fang-Landau; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| this final report presents the results of analyses dealing with three problems related to the foreign object damage resistance of composite fan blades. in the first part, edge impact stresses in an anisotropic plate are calculated incorporating a constrained layer damping model. this protection scheme would use a high damping elastomer layer between an elastic impact protection strip and the edge of the anisotropic plate. it is shown that a ... |
|
| Propellant Burning Rate and Combustion Uniformity Identified by Ultrasonic Acoustic Emissions. |
JAN 1976 |
|
| Authors:
L. H. Caveny; A. J. Saber; M. Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| A new method of measuring the burning rate of as-manufactured grains of nitrocellulose-based propellants was developed. Chamber pressurization to 50,000 psi (3400 atm) was achieved using a hydraulic pump, rather than a nitrogen intensifier system; the burning interval was monitored by recording the acoustic emission from the burning propellant. Burning rate variations of nitrocellulose-based propellants (M1 and M26), burning at pressures between 10,000 and 40,000 psi, were recognized by examining ... |
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| Impact of Composite Plates: Analysis of Stresses and Force. |
JAN 1976 |
|
| Authors:
F. C. Moon ; B. S. Kim ; S. R. Fang-Landau; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| This final report presents the results of analyses dealing with three problems related to the foreign object damage resistance of composite fan blades. In the first part, edge impact stresses inn an anisotropic plate are calculated incorporating a constrained layer damping model. In part II a multilayer model of a composite plate is presented which allows computation of the interlaminar mormal and shear stresses. A computer code was developed for ... |
|
| Experimental Research on Rail Vehicle Safety Using Dynamically Scaled Models |
1976 |
|
| Authors:
Larry M. Sweet; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The following activities have been completed during the first quarter of the program year: a) Design study of similitude parameters to determine model scale to be used over the course of the program. The selected track gauge is 12 inches, or a geometric scale factor of lambda approx. 0.2. b) Experimental measurement of lateral and tangential creep characteristics of LEXAN wheels and rails using a roller rig. LEXAN has been ... |
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| Experimental Research on Rail Vehicle Safety Using Dynamically Scaled Models |
1976 |
|
| Authors:
Larry M. Sweet; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The analytical and experimental design phases of the program are completed. The design of the experiment consists of the following elements: (a) Design study of study of similitude parameters to determine mkodel scale to be used over the course of the program; (b) Design of the track support structure and rail system; (c) Analysis to random irregularities in track alignment, elevation, and gauge, to determine necessary construction tolerances; (d) Detailed ... |
|
| The Review and Evaluation of the Work of Friedrich O. Ringleb |
DEC 1975 |
36 pages |
| Authors:
D. C. Hazen; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| A review of the published works of Dr. F.O.Ringleb and of unpublished notes and data taken from his files at the time of his death was conducted with the intention of identifying any topics which might warrant continued investigation. It was concluded that, although there is a need to continue to pursue Dr. Ringleb's constant search for understanding of the basic nature of vortex flows and his concept of the ... |
|
| Ignition Dynamics in Relation to Combustion Dynamics of Double Base Propellants. |
NOV 1975 |
21 pages |
| Authors:
Martin Summerfield; L. H. Caveny; T. J. Ohlemiller; L. DeLuca; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The Objective of the research was to elucidate the physical and chemical factors that control ignition of double base propellants. Detailed experimental and analytical investigations were conducted to understand the ignition processes that occur at and near the propellant surface, to determine the connection between the ignitability of a propellant and its other combustion characteristics, to quantify the peculiarities of radiative ignition in comparison with hot gas ignition, and to ... |
|
| Erosive Effects of Various Pure and Combustion-Generated Gases on Metals, Part I. |
OCT 1975 |
60 pages |
| Authors:
A. C. Alkidas; S. O. Morris; M. Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| This study presents an experimental investigation of the thermal and chemical erosion characteristics of steel alloys under the short exposure of high pressure and high temperature propellant gases (vented-combustor apparatus) and pure gases (ballistic compressor apparatus). In the vented-combustor tests, the erosion experienced by the alloys is shown to increase with decreasing thermal conductivity and specific heat. The established linear dependence of mass eroded on number of firings suggests that ... |
|
| Burning Rate Measurement of Thin Sheets of Double Base Propellant (HEN-12). |
OCT 1975 |
|
| Authors:
Leonard H. Caveny; Chris R. Felsheim; Martin Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The special problems associated with determining strand burning rates of very thin (0.040 inches) sheets of an NC/NG double base propellant (specifically HEN-12) were assessed and the accuracies of several strand burning experiments were evaluated. Strand burning experiments were carried out in several media over a range of temperatures (20 to 140 F) and pressures (500 to 1500 psi): nonflowing N2, N2 flowing parallel to flame, water, and oil. Except ... |
|
| Compilation of Abstracts - 1975 AFOSR Contractors Meeting on Combustion Kinetics. |
SEP 1975 |
|
| Authors:
PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The report is a collection of the abstracts of talks given by contractors and grantees of the Air Force Office of Scientific Research (AFOSR) in the area of chemical kinetics related to combustion, plume and wake technologies at a meeting held at the Air Force Armament Laboratory, Eglin AFB, Florida, 4-5 September 1975. |
|
| Research on Noise Generated by Ducted Air-Fuel Combustion Systems. |
AUG 1975 |
|
| Authors:
E. G. Plett; H. J. Shafer; M. Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| A two-pronged approach to the study of noise generation by combustion in a confined flow system, similar to a jet engine configuration, has been followed. One aspect deals with the mechanisms of noise generation by combustion; the other aspect deals with the effect of confinement on the noise generation and radiating properties of an unsteady combustion-duct-flow interaction. An experiment to evaluate the relative importance of several of the terms appearing ... |
|
| Abstracts of Presentations for Air Force Office of Scientific Research (AFOSR) Contractors Meeting on Rocket Combustion Dynamics and Electric Combustion Phenomena (1975). Held at Lancaster, California and Edwards AFB, California on 22-25 July 1975. |
JUL 1975 |
|
| Authors:
Leonard H. Caveny; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| This volume contains abstracts of presentations on continuing researches and technology assessments that encompasses: electric propulsion phenomena (including colloid thrusters, pulsed ablative arc discharge, and plasmas); nonsteady combustion processes in rockets, metals combustion, nitramine propellants, deflagration to detonation transition, ultrasonic emissions from flames, monopropellant thrusters, exhaust plumes, and external burning. |
|
| An Exploratory Study of a Three-Dimensional Shock Wave Boundary Layer Interaction at Mach 3 |
MAY 1975 |
|
| Authors:
B. Oskam; I. E. Vas; S. M. Bogdonoff; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| An exploratory experimental investigation has been carried out on the three dimensional flow fields caused by the interaction of oblique shock waves and a planar turbulent boundary layer. The study was performed at a free stream Mach number of 2.95, a Reynolds number per inch of 1.6 million and near adiabatic wall conditions. The interaction was studied on two experimental configurations having different initial boundary layer thicknesses (delta = approx. ... |
|
| Combustion of Hydrocarbons in an Adiabatic Flow Reactor: Some Considerations and Overall Correlations of Reaction Rate |
APR 1975 |
|
| Authors:
Irwin Glassman; F. L. Dryer; R. Cohen; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The applicability of kinetic measurements obtained in induction (ignition) phase measurements such as those made in shock tube and those obtained in the post induction phase by flow reactors has been clearly delineated - particularly with reference to hdyrocarbon oxidation. The usefulness and limitation of global kinetic modelling has also been carefully analyzed. Experimental results show that there appears to be three stages in the paraffin hydrocarbon oxidation process that ... |
|
| Anharmonic Oscillator Lasers. |
31 MAR 1975 |
|
| Authors:
J. A. Smith; S. H. Lam; R. B. Miles; G. K. Bienkowski; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| This report describes research from a program which consisted of several separate, but related, investigation. For the purposes of this report the following names have been given to each of the studies: CO gas dynamic expansion vibrational population measurements; theoretical developments in vibrational kinetics of anharmonic molecules; CO waveguide laser development; time dependent solutions of the master kinetic equations; electric discharge stabilization in a supersonic CO/N2 flow; and computations of ... |
|
| An Experimental Investigation of the Effect of a Fuselage on Wing Characteristics. |
JAN 1975 |
|
| Authors:
Fumio Yoshino; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| A series of experimental investigations utilizing flow visualization, force measurement and pressure distribution techniques to investigate the effect on wing lift of fuselage placement and cross-sectional shape are reported. Emphasis is placed on conditions involving large circulation including the use of circulation control. |
|
| Solid Propellant Combustion Mechanism Research. |
JAN 1975 |
|
| Authors:
Martin Summerfield; Leonard H. Caveny; William G. Valance; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| This annual progress report highlights the progress being made on several continuing combustion mechanism researches. The report summarizes the applications of three recently completed major areas of research: porous propellant combustion, nonsteady burning of AP composite propellants under dynamic pressure conditions, and combustion modeling of AP composite propellants. The following new areas of research (begun in 1974) are summarized: modeling of nitramine mono-propellant flame, deflagration studies of nitrate ester and ... |
|
| Geometric and Performance Characteristics of Commercial Cargo Ships. Part 1. Covering the Decades 1930 through 1950 |
1975 |
|
| Authors:
T. E. Sweeney; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| This paper, dealing with particular characteristics of commercial cargo ships of the 1930 - 1950 era, is but the first of a planned several part series of studies aimed at a preliminary evaluation of the potential of a sailing cargo ship. To put the matter in better perspective the Flight Concepts Laboratory of Princeton University has, over the past decade or so, developed a rather unique sail of very high ... |
|
| A Preliminary Windtunnel Investigation of a Wing Tip Static Pressure Amplification Device |
OCT 1974 |
|
| Authors:
D. C. Hazen; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| A series of windtunnel investigations of a model utilizing a variety of ducted wing tip sections was conducted in the Princeton University 4' x 5' windtunnel during September and October 1974. The ducted section consisted of a venturi entry portion that could be tested with a number of different discharge slots of various geometries. The tests showed that significant amplification of the free stream static pressure could be achieved; that ... |
|
| A Laser Doppler Velocimeter for Measurement of Flows Induced by Flames Propagating over Condensed Fuels |
SEP 1974 |
|
| Authors:
R. J. Santoro; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The primary process in the spread of fire along the surface of a condensed fuel is heat transfer from the burning region of the fuel to the material ahead of the flame. In the early stages of a fire, the two mechanisms by which this heat transfer occurs are conduction and convection ahead of the flame through the gas and fuel phases. The determination of the importance of the convective ... |
|
| Analysis of Edge Impact Stresses in Composite Plates. |
JUL 1974 |
|
| Authors:
F. C. Moon ; C. K. Kang; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The in-plane edge impact of composite plates, with or without a protection strip, is investigated in this work. A computational analysis based on the Fast Fourier Transform technique is presented. The particular application of the present method is in the understanding of the foreign object damage problem of composite fan blades. However, the method is completely general and may be applied to the study of other stress wave propagation problems ... |
|
| Research on Noise Generated by Ducted Air-Fuel Combustion Systems. |
JUN 1974 |
|
| Authors:
E. G. Plett; H. H. Chiu; M. Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| A two-pronged approach to the study of noise generation by combustion in a confined flow system, similar to a jet engine configuration, has been followed. One aspect deals with the mechanisms of noise generation by combustion; the other aspect deals with the effect of confinement on the noise generation and radiating properties of an unsteady combustion-duct-flow interaction. Mechanisms of sound generation, amplification and scattering by various combustion systems have been ... |
|
| Turbulence Measurements in Hypersonic, Helium Flow. |
FEB 1974 |
|
| Authors:
John B. Anders Jr; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| Incompressible and compressible hot-wire theory is reviewed and many of the basic hot-wire equations are derived in detail. The instrumentation and probes used for measurements in a hypersonic boundary layer on the wall of a Mach 16 helium tunnel are described. Procedures for individual wire calibrations are outlined and typical results are presented. Data from measurements at the peak fluctuation point in the boundary layer are presented in terms of ... |
|
| A Critical Review of the Numerical Solution of Navier-Stokes Equations. |
FEB 1974 |
|
| Authors:
Sin-I Cheng; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
| The mathematical foundation and the various practical aspects of the numerical solution of gas dynamic equations are critically reviewed with emphasis on obtaining quantitatively accurate solutions for application in various engineering and sciences. Computational stability rate of convergence and accuracy (or error estimate) are discussed. The promises and problems of the 4th generation computers are outlined within this perspective. Computational stability shoud not be obtained at the sacrifice of the ... |
|
| Ignition Dynamics of Double Base Propellants |
JAN 1974 |
48 pages |
| Authors:
M. Summerfield; L. H. Caveny; T. J. Ohlemiller; L. DeLuca; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
|
|
| An Experimental Study of the Site and Mode of Action of Platonizers in Double Base Propellants, |
1974 |
|
| Authors:
N. Kubota; T. J. Ohlemiller; L. H. Caveny; M. Summerfield; PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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| Certain metal organic salts (e.g., lead or copper salicylate) when used in double base propellants induce desirable insensitivities of burning rate to pressure and initial temperature. To understand this, the combustion wave zones (luminous flame, dark, fizz, and surface reaction zones) were examined by means of photography and fine thermocouples (4 micron bead). The metal salts significantly alter the surface and fizz zones. The surface zone accumulates carbonaceous material coincident ... |
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