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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Computer program for optimum flight path defined by flight test investigation of performance characteristics /excess thrust, fuel flow, and climb potential/ of F-104G aircraft
Evaluation of refractory metal alloy metering and isolation valves for alkali metal service at 1900 F
Earth Resources Technology Satellites E and F orbits and remote sensor instruments for coastal oceanographic data collection
Notch sensitivity of creep-rupture properties of Waspaloy between 1000 to 1400 F
Thrust measurement system and aerodynamic drag effects of underwing J-85 engine nacelles on F-106 aircraft propulsion system performance
Preliminary sector tests at 920 K of three afterburner concepts proposed for inlet temperature of 1260 F and comparison of results with conventional V-gutter flame holder
In-flight F-111 data on total and static pressure from left inlet during automatically scheduled and manually controlled off-schedule positioning of spike at Mach 0.68 to 2.18
A static stress analysis and a dynamic modal analysis of the horizontal stabilizer of the F-14A aircraft has been conducted at the Naval Air Development Center employing the NASTRAN program. The structural model contains 1518 elements including bars, rods, shear panels and orthotropic and isotropic membrane elements with 1357 degrees of freedom. Static deflection and stresses, including thermal stresses, under maximum load at room and at elevated temperatures are calculated and results are in good agreement with experimental data. Through application of "Guyan Reduction" the number of degrees of freedom used in the dynamic analysis is reduced to 137 . The frequencies and mode shapes for the first two modes are obtained .
Nighttime F region molecular ion concentrations of oxygen and nobelium and associated nightglow morphology, using numerical method for solving nonlinear equations
F region diurnal behavior, comparing neutral winds and electric field effects
ATS F and G, discussing communications experimental program with deployable 30 ft parabolic antenna
E and F region positive ion composition, electron concentration and thermal balance vertical profile, discussing ionizing radiation spectrum, plasma cooling, primary chemical reaction rates and ionospheric formation
Minimum time profiles for F-104 aircraft by Balakrishnan epsilon technique, comparing solutions with energy method
Airframe installation effects on underwing nacelle nozzle performance, using calibrated engines and load cells on F-106 for measurements
F region seasonal anomaly relationship with lower atmosphere composition changes, discussing effects of oxygen/nitrogen relative concentration on ionospheric and atmospheric parameters
Three-track runway and taxiway profiles are presented for use in studies of airplane response to ground roughness. This report presents the tabulated and plotted data for two international airports (designed airports E and F).
Elastohydrodynamic (EHD) film thicknesses have been measured, by means of an X-ray technique, under conditions that closely simulate the ball-race contact in advanced turbine engine thrust bearings. The experiments were conducted with a rolling-disk machine using disks which yield a contact zone similar to that in the actual bearing. Both the rolling and spinning motions of the ball relative to the race were simulated by the apparatus. Four lubricants were evaluated at temperatures to 600 F and maximum Hertz stresses to 350,000 psi. The X-ray film thickness data correlated well with observations of surface distress (or lack thereof) in full-scale bearing tests with the same lubricants under similar conditions of temperature and load. The predicted variation of film thickness with speed and viscosity as verified, although the magnitude of measured film thickness was generally one-half to one-third of predicted values. An effect of stress greater than predicted was consistently observed in the higher stress range.
Consolidated powders of four nickel-base superalloys were studied for potential application as compressor and turbine discs in jet engines. All of the alloys were based on the Rene' 95 chemistry. Three of these had variations in carbon and A12O3 contents, and the fourth alloy was chemically modified to a higher volume fraction. The A12O3 was added by preoxidation of the powders prior to extrusion. Various levels of four experimental factors (1) alloy composition, (2) grain size, (3) thermomechanical processing, and (4) room temperature deformation plus final age were evaluated by tensile and stress rupture testing at 1200 F. Various levels of the four factors were assumed in order to construct the statistically-designed experiment, but the actual levels investigated were established in preliminary studies that preceded the statistical process development study.