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An Experimental Study of Diffusers in an Open-Jet, Low-Density, Hypersonic Wind Tunnel

Report Number: AEDC TDR 64-47
Author: Boylan, David E.
Corporate Author: ARO, Inc.
Date of Publication: 1964-04
Pages: 61
Contract: AF 40(600)-1000
Project: 8950
Task: 895004
AD Number: AD0434380

An experimental investigation of supersonic diffuser performance in a flow regime in which viscous and compressibility influences are equally important was conducted. The investigation involved Mach numbers from 6 to 16.5. It is shown that, although diffuser recovery compared to higher density regimes is small, using the proper diffuser allowed the required wind tunnel exhaust pressure to be up to 35 times the pressure existing in the test chamber. While this may not seem exceptional at first glance, it is important to note that this was achieved in conjunction with Reynolds numbers on the order of 10 to the minus 3 power below those typical of tunnels yielding higher recoveries.

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