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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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Chamber pressure, contraction ratio, and flow per element effects on acoustic mode instability in hydrogen oxygen engines
First hydrostatic stellar contraction phase for cases without full convection and adiabatic temperature stratification
Performance test from Mach 2.58 to 1.98 of axisymmetric mixed-compression inlet system with 60 percent internal contraction
Incentive contracts bibliography
Restart and high response terminal shock control for axisymmetric mixed-compression inlet with internal contraction
Shape preserving expansion and contraction of objects in E 3
Flow and heat transfer measurements for heated air in subsonic flow through contraction section connecting tube to conical section
Earth thermal plasmasphere contraction subsequent to solar flare obtained from ion mass spectrometers on OGO satellites
Cost plus award fee contracting incentive system based on after fact evaluation of performance effectiveness
Roles of scientists and engineers in research and development contracts
DOD laser research and development contracts management
Effects of reductions in NASA contracts on unemployment of aerospace employees
Wind tunnel tests to determine Mach 2.5 performance of bicone inlet with internal focused compression and 40-percent internal contraction
Jupiter model construction from improved state equation, considering chemical composition, contraction and rotation
The inlet was designed to have the minimum internal contraction consistent with high total-pressure recovery and low cowl drag. Without a bypass system, the peak pressure recoveries increased from 0.890 to 0.936 when the supercritical bleed mass flow ratio was varied from 0.035 to 0.060. With an operating bypass system and installed centerbody vortex generators, a slight increase in peak pressure recovery was obtained. The values of steady-state distortion and dynamic distortion were below 0.10 and 0.02, respectively, near critical operation. Simulation of a turbofan engine with concentric pipes showed no effect on compressor face flow profiles with varying bypass flow ratio.
An analysis is made of pulse and echo orientation cries of the Mustache Bat. That bat's cries are characterized by a long, 60 to 30 msec, pure tone component and brief beginning and terminal FM sweeps. In addition to obvious echo overlap and middle ear muscle contractions, the following are examined: (1) characteristics of pulse- and echo-evoked potential under various conditions, (2) evidence of changes in hearing sensitivity during and after pulse emission, and (3) the role of the middle ear muscles in bringing about these changes.