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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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Optimum thrust nozzle contours for chemically reacting gas flows, obtaining set of partial differential equations for gas dynamic properties
Unsteady liquid and gas flow with heat addition and shock perturbation
Radiation and forced convective heat transfer to seeded flowing gas from arc enclosed by quartz tube
Frozen flow and nonequilibrium flow of real gas past pointed bodies, solving partial differential equation by integral relations method
Frozen flow and nonequilibrium flow of real gas past pointed bodies, solving partial differential equation by integral relations method
Fluid mechanical model of electric arc balanced magnetically in gas flow, based on photographs showing arc must simulate solid body
Formation of gas flow before flame front
Rarefied gas flow through passages with static boundaries noting development of theoretical models
Rarefied gas flow through passages with static boundaries noting development of theoretical models
The two principal areas of advanced propulsion investigated are the ram accelerator and the flowing gas radiation heater. The concept of the ram accelerator is presented as a hypervelocity launcher for large-scale aeroballistic range applications in hypersonics and aerothermodynamics research. The ram accelerator is an in-bore ramjet device in which a projectile shaped like the centerbody of a supersonic ramjet is propelled in a stationary tube filled with a tailored combustible gas mixture. Combustion on and behind the projectile generates thrust which accelerates it to very high velocities. The acceleration can be tailored for the 'soft launch' of instrumented models. The distinctive reacting flow phenomena that have been observed in the ram accelerator are relevant to the aerothermodynamic processes in airbreathing hypersonic propulsion systems and are useful for validating sophisticated CFD codes. The recently demonstrated scalability of the device and the ability to control the rate of acceleration offer unique opportunities for the use of the ram accelerator as a large-scale hypersonic ground test facility. The flowing gas radiation receiver is a novel concept for using solar energy to heat a working fluid for space power or propulsion. Focused solar radiation is absorbed directly in a working gas, rather than by heat transfer through a solid surface. Previous theoretical analysis had demonstrated that radiation trapping reduces energy loss compared to that of blackbody receivers, and enables higher efficiencies and higher peak temperatures. An experiment was carried out to measure the temperature profile of an infrared-active gas and demonstrate the effect of radiation trapping. The success of this effort validates analytical models of heat transfer in this receiver, and confirms the potential of this approach for achieving high efficiency space power and propulsion.
Physical and mathematical models of gas flows with chemical and radiative effects
Oblique shock wave parameter correlation for some specific heat ratios with application to real gas flows
A Reduced-Noise Gas Flow Design Guide has been developed for the NASA Glenn Research Center at Lewis Field by Nelson Acoustical Engineering of Elgin, Texas. Gas flow systems are a significant contributor to t he noise exposure landscape at Glenn. Because of the power of many of these systems, hearing conservation and community noise are importan t issues. The purpose of the Guide is to allow Glenn engineers and de signers to address noise emission and control at the design stage by using readily available system parameters. Although the Guide was deve loped with Glenn equipment and systems in mind, it is expected to hav e wide application in industry.
Method of sphere-drag measurement in supersonic gas flows using low-density wind tunnel
Brazing retort manifold minimizes air contamination, prevents gas entrapment during purging, and provides uniform gas flow into the retort bell. The manifold is easily cleaned and turbulence within the bell is minimized because all manifold construction lies outside the main enclosure.
Rarefied gas flow through ultrafine porous filtering media used to predict flow rate
Equation from blast wave correlation of pressures on blunt nosed cylinders in perfect and real gas flows at hypersonic speeds
Group classification of equations describing one-dimensional gas flows