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Experience With An Overexpanded Nozzle In A Low-Density, Hypervelocity Wind Tunnel

Report Number: AEDC TDR 62-85
Author: Potter, J. Leith
Author: Boylan, David E.
Corporate Author: ARO, Inc.
Laboratory: Arnold Engineering Development Center
Date of Publication: 1962-04
Pages: 16
Contract: AF 40(600)-800
Project: 8950
Task: 895004
AD Number: AD0274383

Abstract:
Detailed measurements of static and impact pressures in the nozzle of a low-density wind tunnel are presented. Purpose of the investigation was to determine the extent to which the nozzle of the Low-Density, Hypervelocity Tunnel may be used in an overexpanded mode of operation. Expansions to static pressure from one-fourth to one-fifth of the pressure outside the exit of the nozzl are shown to be feasible with the nozzle having a nominal Mach number of 10 and boundary-layer thickness approaching nozzle radius at the exit.


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IIT
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