| Experimental Investigation of a Lift Augmented Ground Effect Platform |
SEP 2005 |
108 pages |
| Authors:
Roberto T. Igue; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
 | This experimental study investigated the feasibility of applying the concept of a skirtless hovercraft into the production of an operational vehicle. A 0.255 m diameter prototype was designed, built and tested. An air bearing table was used as a testing platform, virtually eliminating the influence of friction and providing one degree of freedom for the experiments. Static tests were performed at various heights and craft configurations, providing a wide range ... |
|
| HELBASE: A Tool for the Analysis of High Energy Laser Weapon Development, Deployment, and Operation |
DEC 1980 |
187 pages |
| Authors:
Jeffrey L. Dutton; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| A computerized simulation model was developed as a flexible tool to aid in the design, deployment, and employment decisions regarding high energy laser weapons. Only the 'space defensive' and 'antisatellite' missions are considered. The simulation models the physical processes of laser propagation and laser effects, and it includes a 'first-order' optimization process for selection of weapons and weapon paths of maximum efficiency. It also includes a 'many-on-many' engagement model to ... |
|
| The Effects of Refractive Error on the Detection and Identification of Simple and Complex Targets |
DEC 1980 |
104 pages |
| Authors:
Julie B. Cohen; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The effect of refractive error on the detection and identification of simple and complex targets was studied. Contrast sensitivity to sine-wave gratings of spatial frequencies from 0.61 to 22 cycles per degree with induced refractive errors of 0, +1, +2, +3, +4, +5, and +6 diopters were measured. Objective subject accommodation measurements were determined. The contrast needed to detect and identify Snellen letters and aircraft was also measured at the ... |
|
| A Method of Characterizing Air-to-Air Missile Endgame Models |
MAR 1980 |
235 pages |
| Authors:
Gregory A. Keethler; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| Air-to-air missile endgame programs typically require tens of seconds of computer time to calculate a single estimate of probability of kill (P(K). Thousands of these estimates may be required in any given endgame analysis. The main objective of this research was to develop a method for characterizing an endgame model using only a fraction of the amount of data generated by such analyses. In pursuit of this objective, a second ... |
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| The History of Fallout Prediction |
01 JUN 1979 |
38 pages |
| Authors:
Jay C. Willis; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The development of the science of fallout prediction in this country from 1950 to 1979 is described. The chronological description emphasizes early developments and the relationships between some of the significant calculational models. The earliest work on fallout prediction discussed in that performed by RAND on Project Aureole in 1954, and the evolution is carried through to the derivatives of the DELFIC computer code. A section is devoted to the ... |
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| A Study of the Use of Laminated Composite Wing Structures for Controlling the Divergence Speed of Forward Swept Wings |
DEC 1978 |
75 pages |
| Authors:
David C. Bannerman; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This thesis is an investigation of the effects of composite laminate orientation on the divergence problem of forward swept wings. The aerodynamic and structural properties are modeled with a doublet lattice technique and finite element method, respectively. The static equilibrium equation is applied to combine the two models. This results in an eigenvalue problem with the divergence dynamic pressure as the lowest eigenvalue. A computer program is written to formulate ... |
|
| Contrast Sensitivity of the Human Visual System at One Luminance Level While Adapted to a Stimulus at Another Luminance Level |
DEC 1978 |
145 pages |
| Authors:
Charles G. Smith; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This report documents an investigation of the hypothesis that the organization of the receptive fields in the human visual system changes to compensate for changes in the average luminance of the visual stimulus. Foveal measurements of contrast sensitivity to sinusoidal spatial frequency were made at one luminance level while the subjects were adapted to a spatial sinusoid of a different average luminance. The luminance levels used were 3.65 and 35.5 ... |
|
| High Power Continuous Wave Semiconductor Injection Laser |
DEC 1978 |
78 pages |
| Authors:
John C. Griffin III; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| A review of fundamental semiconductor laser theory is presented, followed by a theoretical analysis of the figures of merit, which affect high power CW operation. It is postulated that high CW power of the order of several watts can be obtained from long lasers with low end reflectivities. The removal of heat from the junction region can be best accomplished in narrow lasers with a width near 50 micrometers. Further ... |
|
| HUFF, a One-Dimensional Hydrodynamics Code for Strong Shocks |
DEC 1978 |
107 pages |
| Authors:
David J. Peters; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| HUFF is a one-dimensional Lagrangian hydrodynamics computer code developed from the basic principles of mass, momentum, and energy conservation for strong shock propagation in a solid or gas. Two equations of state are used - the adiabatic ideal gas law with a variable gamma and the Gruneisen solid equation of state with a constant Gruneisen ratio. The Richtmyer and Morton difference equations for strong shocks are used on a spatial ... |
|
| Effects of Antenna Arrays on Broadband Signals. |
SEP 1978 |
142 pages |
| Authors:
Edward Raska Jr; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This paper develops a complex, baseband model for an adaptive array. The array is assumed to have N isotropic elements. Only two aspects of arrays are modeled: spatial propagation delays and the weighting coefficients. The array model is used to determine the effects of arrays on wideband signals. The most important finding is that the output of the array consists of the input signal and its time derivatives. Each ... |
|
| An Experimental Study of a Catalytic Combustor for an Expendable Turbojet Engine |
MAR 1978 |
43 pages |
| Authors:
Larry E. Taylor; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| A catalytic combustor was designed, an existing one modified, and both were tested on a small turbojet engine. The existing catalytic combustor, combustor A, used straight through flow and was modified by adding a flame arrestor to the combustor inlet. Combustor B was designed to use reverse flow with a preburner and air dilution zones. Combustors A and B were designed for an air capacity up to 0.75 lbm/sec and ... |
|
| Optimal Terrain Following Controller for an Optimized Spline Reference Path |
DEC 1977 |
136 pages |
| Authors:
Ronald T. Kelly; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This thesis presents the design of a proposed terrain following flight controller capable of tracking a cubic spline reference path. The controller tracks only the longitudinal motion; however, it provides both thrust and elevator control. The controller is based on a nonlinear reference model constructed from an optimized spline path. The spline path altitude and associated derivatives are computed. The longitudinal equations of motion are linearized about the reference trajectory ... |
|
| Comparison of Fast Fourier Transforms with Other Transforms in Signal Processing for Tactical Radar Target Identification |
DEC 1977 |
177 pages |
| Authors:
Robert L. Herron; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The High Resolution Radar Branch of the Rome Air Development Center has developed a tactical target identification (TTI) pulsed-Doppler radar system which generates two-dimensional 'images' of aircraft. The signal processing technique utilizes the fast Fourier transform (FFT) to produce a slant-range versus cross-range display. If the TTI system is to be effectively employed in an aerial warfare environment then real-time processing is necessary. In an effort to speedup the signal ... |
|
| An Aerodynamic Investigation of a Forward Swept Wing |
DEC 1977 |
115 pages |
| Authors:
Kenneth Lewis Sims; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This study consisted of modeling and wind tunnel testing of a high speed, subsonic, low aspect ratio, forward swept wing with an advanced supercritical airfoil section for the purpose of determining its lift, drag, and pitching moment characteristics as compared to a similar aft swept wing. Tests were conducted at Mach numbers of 0.63 to 0.93 in the Air Force Flight Dynamics Laboratory's Trisonic Gasdynamic Facility located at Wright-Patterson Air ... |
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| Direct Solutions of Large, Sparse Linear Systems |
DEC 1977 |
153 pages |
| Authors:
Michael F. Poore; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| A comparison is made of the merits of three popular algorithms for direct solutions of large, sparse matrices: Gaussian Elimination, LU Decomposition, and Gauss-Jordan Reduction. A mathematical theory discussion explains the algorithms and predicts their performance for arbitrary and strongly structured matrices. Particular emphasis is placed on solution accuracy and the efficient use of core space. The same test problems are used to analyze the Gaussian Elimination algorithm programmed by ... |
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| Navigational Accuracy Requirements of Aeromaneuvering Space Vehicles. |
MAR 1977 |
75 pages |
| Authors:
Robert J. Chambers; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| A preliminary investigation was conducted to determine the navigational accuracy required by the Aeromaneuvering Orbit-to-Orbit Shuttle (AMOOS) during the atmospheric phase of flight. The guidance scheme, which is the same as the one developed by Lockheed in the original AMOOS study, uses the parameters of velocity, flight path angle, and density altitude to correct to a nominal trajectory. Density altitude is obtained from atmospheric density, which is calculated from vehicle ... |
|
| An Analysis of the Impact of the New OER System on the Officer Corps Using a Lewin-Based Model |
DEC 1976 |
130 pages |
| Authors:
Ralph A. Blakelock; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| One of the most important and controversial issues among Air Force officers is the new Officer Evaluation System (OER). The new system was adopted in 1974 because of widespread dissatisfaction with the previous evaluation system. Yet, nearly two years later, many officers still regard this system with trepidation and anxiety. This thesis investigated several aspects of the new OER system. It reviewed some general concepts of performance appraisal and then ... |
|
| A Study of Military-Civil Service Differences in Quality of Life |
DEC 1976 |
271 pages |
| Authors:
Wayne R. Mathis; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This study analyzed the differences in Air Force members (military) and Civil Service employees (civilian) concerning replies to 3 Quality of Life surveys. The two groups often do the same work, even side by side, yet the two groups do not always share the same rewards and benefits. Discriminant analysis --a powerful analytic tool that allows one to distinguish between two or more populations--was used to analyze the data. Military ... |
|
| An Evaluation of Mass Integral Scaling as Applied to the Atmospheric Radiation Transport Problem |
NOV 1976 |
201 pages |
| Authors:
Raymond A. Shulstad; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This report presents the results of a comprehensive evaluation of mass integral scaling (MIS) as applied to the atmospheric radiation transport problem. MIS is an approximation used to predict the free-field radiation environments from atmospheric nuclear detonations. Codes like SMAUG and ATR use mass integral scaling of infinite homogeneous air transport data to generate environments which purport to reflect the near exponential vertical variation in density of air. The results ... |
|
| An Exploratory Study of Software Cost Estimating at the Electronic Systems Division. |
JUL 1976 |
163 pages |
| Authors:
Thomas J. Devenny; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The estimate of software development cost is the key piece of information in many software management decisions. No technique exists which can consistently produce the reliable and accurate cost estimates which managers need. This thesis research effort explored the software cost estimating process at the Electronic Systems Division of the Air Force Systems Command. The purpose of the research was to provide managers, researchers, and cost estimators with a better ... |
|
| Conceptual Study of a Low Cost Turbojet Engine |
MAR 1976 |
87 pages |
| Authors:
Tommy J. Kent; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| One candidate for an inexpensive engine is a turbojet constructed by adding a combustion chamber and nozzle to a commercial turbocharger for a reciprocating engine. Two turbocharger-engines were produced in this way capable of handling approximately .6 lb/sec and 1.5 lb/sec airflow. A performance analysis using thermodynamic cycle analysis techniques was done to predict the thrust that could be generated by these engines. The maximum thrust predicted was 27 lb ... |
|
| Combustor Design for Low Cost Expendable Turbojets |
MAR 1976 |
57 pages |
| Authors:
Raymond L. Greene; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The development of two experimental burners was completed as part of a project to evaluate the suitability of the use of converted reciprocating engine turbochargers as expendable jet engines for remotely piloted vehicles. As a result of analytic studies, Burner 'A' was constructed as a reverse flow burner and was designed to accept a mass flow up to 0.75 lbm/sec. Burner 'B' was also reverse and designed for a mass ... |
|
| An Experimental Investigation of Pressure Oscillations in Two- Dimensional Open Cavities |
DEC 1975 |
68 pages |
| Authors:
Michael F. Marquardt; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| An experimental study was conducted to determine the characteristics of the pressure oscillations in a small two-dimensional cavity exposed to tangential air flow. Various cavity configuration changes, involving the shape of the leading and trailing edge, were investigated to determine the relative capability to suppress the resonance in the cavity response. Five airflow Mach numbers (0.5, 0.6, 1.0, 1.3, 1.5) were used to investigate the Mach-response relationship. Two cavity lengths ... |
|
| Ballistic Impact Flash Resulting from Complete Projectile Penetration of Titanium Targets |
DEC 1975 |
144 pages |
| Authors:
Joseph G. Aja; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The down range flash resulting from the perforation of thin titanium plates by high velocity steel spheres was investigated to quantify the magnitude and duration of this flash. The titanium flash was compared with the flash resulting from identical spheres impacting aluminum targets. Visually the titanium flash was significantly larger, but measurement of the spectral irradiance at selected wavelengths found the peak intensities were approximately the same. The duration time ... |
|
| Atomatic X-Ray Diffraction Machine Measurement of Residual Stress in Aluminum Alloys |
DEC 1975 |
70 pages |
| Authors:
Donald H. Gray; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| Fastress automatic x-ray diffraction machine measurement of stress in aluminum alloys is compared with stress determined by strain gage and conventional x-ray diffraction techniques. Modification of the Fastress specimen positioner and operating procedures were required for acceptable performance. The modified machine and procedures resulted in measurement of stress in 2024-T6 aluminum alloy with a maximum error of 3,400 psi and a mean error of 2,600 psi compared to the strain ... |
|
| A Study of the Program Management Responsibility Transfer Process for the F-16. |
SEP 1975 |
106 pages |
| Authors:
John D. Rominger; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This report analyzes the Program Management Responsibility Transfer (PMRT) Process for several major aircraft weapons systems for the purpose of applying lessons learned to the F-16 PMRT process. The report looks at the problems encountered on previous switchover systems and recommends solutions or methods by which the F-16 can avoid the same problems. The primary data sources for this report were personal interviews of key program management personnel and official ... |
|
| An Investigation of the Static Thrust Augmentation Capabilities of a Divergent Ejector-Afterburner |
JUN 1975 |
115 pages |
| Authors:
Carl H. Steiling Jr; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The effects on static thrust augmentation and mass entrainment of various divergent ejector-afterburner configurations were investigated. Static tests were conducted using a gaseous oxygen/hydrogen sonic rocket as the primary gas generator. Configurations included various length mixing ducts, two different size diffusers, burn ducts, and secondary nozzles. Oxydizer-to-fuel mixture ratio was varied from .3 to 1.5 at 80 psia chamber pressure. Results indicated maximum static thrust augmentation (22%0 when the relatively ... |
|
| Evaluation of a Proposed INS Kalman Filter in a Dynamic Flight Environment |
DEC 1974 |
187 pages |
| Authors:
Jerry E. Hammett; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This report is an evaluation of a proposed Kalman filter for an advanced manned aircraft. The evaluation is performed under simulated flight profiles which include straight and level and maneuvering flight. The aided inertial navigation system is represented by a 54-state linear system error model and the filter by a 17-state error model with decoupled horizontal and vertical channel mechanization. The simulated flight profiles include two hours of straight and ... |
|
| Design of a Deployable Wing Glider |
DEC 1974 |
77 pages |
| Authors:
Phillip L. Abold; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| An unpowered, unguided vehicle to be deployed from a 4.75 inch flare tube was designed. The design criteria were: six cubic inch, two pound payload, minimum glide speed of 50 knots, and stable with particular emphasis on heading stability. Two basic configurations were considered in the analysis: the first was a tailless vehicle, and the second was a conventionally tailed vehicle. It was found that the tailless vehicle could not ... |
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| Predictive Modeling of the Academic Performance of USAF Academy Preparatory School Graduates at the USAF Academy |
DEC 1974 |
88 pages |
| Authors:
Kenneth R. Anderson; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This study used linear models developed by stepwise multiple regression to examine the relationship between performance at the USAF Academy Preparatory School and subsequent grade point average (GPA) at the USAF Academy. Data collected on Prep School graduates in the Academy classes of 71 through 77 who had completed at least their first year at the Academy provided potentially significant quantitative factors for predicting Academy GPA. The proposed Prep School ... |
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| An Experimental Investigation of High Subsonic Flow Over an Off Axis Longitudinal Cavity with Antiresonance Devices |
DEC 1974 |
101 pages |
| Authors:
Kenneth Vaccaro; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| This study is a preliminary effort to reduce the level of the resonance and to provide a means of predicting the pressure gains and resonant frequencies associated with a forward facing cylindrical cavity in high subsonic flow. The basic model was an ogive cylinder fitted with an off-axis longitudinal cavity. Eleven different suppression devices were investigated. Transmission line theory was used very effectively to predict the pressure gains and resonant ... |
|
| Outpatient Scheduling - A Simulation Approach. |
APR 1971 |
|
| Authors:
Ronald K. Hall; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
 | Obstetric outpatients, attending the prenatal clinic at the Wright- Patterson AFB Medical Center, were frequently required to wait in excess of one hour to see a doctor even though their consultations are scheduled by appointments. Two causes that contribute to this waiting time are the uncertainty as to the number of doctors that will be available for the clinic and the attempt to eliminate doctor idle time. A computer simulation ... |
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| An Analysis of Factors Influencing Spare Engine Management |
NOV 1970 |
|
| Authors:
Ted L. Kehl; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The report deals with the problems and complexities faced by the Air Force in attempting to determine proper spare engine levels. Spare engine levels are examined as a function of both requirement factors and management decisions concerning the methods and techniques to be used for dealing with the requirement factors. Systems theory is introduced to present a conceptual framework for better understanding the viewpoints and priorities possessed by the organizations ... |
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| Synthesis of a Suboptimal Guidance Law to Minimize the Terminal Error of an Entry Vehicle |
JUN 1970 |
|
| Authors:
Richard E. Holdeman; Michael W. Wynne; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The purpose of this thesis is to use the concept of minimizing position sensitivity coefficients to minimize the terminal position error of an entry vehicle. Modern control theory is applied to the problem with a lumped parameter control which includes vehicle design parameters. A simulation including a Kalman filter is used to validate the feedback scheme obtained. The minimum sensitivity coefficient trajectory obtained is one which is dominated by lift ... |
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| Active Control for Aircraft Landing Gear |
JUN 1970 |
|
| Authors:
Ronald A. De Yoe; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The purpose of the thesis is to investigate the use of active control on aircraft landing gear. The problem of vibration isolation is considered using the optimal control approach to establish the control force necessary to minimize runway imposed vibration. A two degree of freedom linear landing gear model is considered, and both the (1-cos wt) bump and an equivalent deterministic input derived from runway spectra, are used as vertical ... |
|
| Friction and Wear Characteristics of 1020 Steel on Concrete |
MAR 1970 |
87 pages |
| Authors:
Eugene F. Bouma; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The experimental apparatus incorporated a 1020 steel rider on a rotating concrete wheel. The tests conducted were limited to contact pressures of 5, 7 1/2, and 10 psi, and velocities less than 50 mph. It was found tha the coefficient of friction was independent of load, but decreased with increasing velocity. For all contact pressures, the wear of the steel compared to the wear of the concrete was approximately the ... |
|
| An Exploratory Study of Perceived Career Progress Among Civil Service Scientists and Engineers Assigned to Air Force Laboratories |
DEC 1969 |
172 pages |
| Authors:
Thomas J. Mackey; John C. Totten; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| An experimental study was conducted on scientists and engineers to determine the perceptions they had concerning their career progression. The data for the research was obtained through the use of a questionnaire which was distributed to a random sample of scientists and engineers working in the United States Air Force laboratories. The questionnaire asked the individuals sampled to rate their career aspirations, their career expectations, and to rate how conducive ... |
|
| Comparison of Reliability Allocation Optimization Methods |
DEC 1969 |
63 pages |
| Authors:
William Z. Spivey; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The reliability allocation problem has previously been solved by methods other than the classical optimization methods. The thesis brings together and compares three allocation models that are based on optimization methods. It was found that dynamic programming gives the optimal solution to the allocation problem. The model based on Lagrange multipliers gave a solution that was within 0.5% of the optimal solution given by dynamic programming. The linear programming algorithm ... |
|
| Determination of Manpower Requirements for Scientists and Engineers |
SEP 1969 |
99 pages |
| Authors:
William A. Brummer; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The establishment of operational manpower requirements for scientists and engineers is an important function of management. The objective of the research was first to describe and then to analyze this function for improvement. To describe the present procedure, the literature was reviewed; information was requested from industrial firms, professional societies, and governmental agencies; and more than fifty persons were interviewed. |
|
| Interferometer Study of Free Convection about a Rectangular Cavity in a Flat Plate |
MAR 1969 |
|
| Authors:
Karl E. Luesse; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| Interferometer study was made to determine the effect of a rectangular cavity on the heat transfer rate from a heated vertical flat plate. Cavities 1 in. wide with depths of 0.2 in., 0.4 in. and 0.6 in. were placed perpendicular to the flow. Each cavity was located at four elevations 26.7 in., 32.7 in., 38.7 in. and 44.7 in. The temperature difference was constant at 130 R which resulted in ... |
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| Optical Study of Supersonic Flow over a Rearward Facing Step |
MAR 1969 |
|
| Authors:
Albert L. Waters; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The supersonic flow field over a rearward facing step was studied with a schlieren system. The effect of Mach number variation, step height variation, and total pressure variation on the expansion fan angle, lip shock angle, flow turning angle, reattachment point, and reattachment shock angle was determined. Schlieren photographs of the flow at Mach number 2.7 to 3.1, step heights of 1/4 to 3/4 in, and total pressures of 60 ... |
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| THE LATTICE PARAMETERS OF SIX BINARY TITANIUM ALLOYS AT CRYOGENIC TEMPERATURES |
JUN 1968 |
|
| Authors:
Roby G. Inness Jr.; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The lattice parameters of six binary titanium alloys (3.10A1, 4.99a1, 2.11V, 4.04V, 1.37Sn, and 2.56Sn) were determined over temperature range 300 to 5K using the powder x-ray diffraction technique. Both the 'a' and 'c' lattice parameters decreased linearly from 300K to a 'break point' between 125 and 100K. The 'a' lattice parameter then continued to decrease, at a reduced rate, from the 'break point' to 5K. Below the 'break point' ... |
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| THE EFFECT OF ORDERING ON THE AVERAGE RATE OF CONVERGENCE OF THE POINT SUCCESSIVE OVERRELAXATION ITERATIVE METHOD |
FEB 1968 |
|
| Authors:
Richard E. Durrett; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The point successive overrelaxation iterative method is applied to the five point finite difference approximations to Laplace's equation and the heat equation using two consistent orderings and one non-stationary iterative procedure. The consistent orderings are found to be asymptotically faster than the non-stationary procedure and to display different iterative speeds. The ordering denoted odd-even parity is found to be 20% faster than the natural ordering for an error vector reduction ... |
|
| THRUST VARIATION OF A GASEOUS PROPELLANT ROCKET ENGINE |
JUN 1967 |
80 pages |
| Authors:
Frederick J. De Groot; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
|
| The purpose of this thesis was to investigate the performance of a variable thrust rocket engine incorporating a variable area injector. The injector was designed, constructed, and assembled on an existing thrust chamber which was lengthened and provided with water cooling. Gaseous hydrogen and oxygen were used as propellants. The thrust was varied over a continuous range from 11 to 75 pounds, resulting in a throttling ratio of 6.82:1, while ... |
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