AN ANALYTICAL AND EXPERIMENTAL INVESTIGATION OF ANNULAR INJECTION OF HELIUM INTO A SUPERSONIC AIR CORE.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING
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When a lightweight gas is injected into the boundary layer of a high-speed air flow, the adiabatic wall temperature is reduced by means of a change in properties of the gas in the region where viscous dissipation occurs. The paper summarizes some of the results of a controlled experiment in which helium was injected through an annular slot and along the impermeable surface of a 1.46 inch diameter tube in which a supersonic air stream was flowing at a Mach number of about 4.8. A discussion of some of the analytical results which were obtained is also given. The experimental portion of the investigation included the development of miniaturized boundary layer instrumentation capable of measuring velocity, temperature, and concentration profiles of the flow.