Methods for Distinguishing Type of Hypersonic Boundary Layer in Shock Tunnel.
GENERAL ELECTRIC CO SCHENECTADY N Y RESEARCH AND DEVELOPMENT CENTER
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An experimental program for studying the transition phenomenon, boundary layer characteristics, and local heat transfer rates on 4- and 8-foot long 10 deg included angle cones in a hypersonic chock tunnel has brought about the development and improvement of instrumentation and methods for distinguishing hypersonic laminar, transition, and turbulent boundary layers in relatively short test time experimental facilities. The methods used include schlieren optics, local heat transfer rates from thin-film sputtered platinum surface gauges, and surveys through the boundary layer using impact pressure, total temperature, and thin heat transfer wedges. Also, the actual oscilloscope traces, directly from the heat transfer instrumentation, be used to define the type of boundary layer. Author
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