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Roughness, bluntness, and angle-of-attack effects on hypersonic boundary-layer transition

Published online by Cambridge University Press:  28 March 2006

H. T. Nagamatsu ,
B. C. Graber  and
R. E. Sheer
H. T. Nagamatsu
Affiliation:
General Electric Research Laboratory, Schenectady, New York
B. C. Graber
Affiliation:
General Electric Research Laboratory, Schenectady, New York
R. E. Sheer
Affiliation:
General Electric Research Laboratory, Schenectady, New York
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Abstract

An investigation was conducted in a hypersonic shock tunnel to study the laminar boundary-layer transition on a highly cooled 10° cone of 4 ft. length over the Mach-number range of 8·5 to 10·5 with a stagnation temperature of 1400 °K. The effects on transition of tip surface roughness, tip bluntness, and ± 2° angle of attack were investigated. With fast-response, thin film surface heat-transfer gauges, it was possible to detect the passage of turbulent bursts which appeared at the beginning of transition. Pitot-tube surveys and schlieren photographs of the boundary layer were obtained to verify the interpretation of the heat-transfer data. It was found that the surface roughness greatly promoted transition in the proper Reynolds-number range. The Reynolds numbers for the beginning and end of transition at the 8·5 Mach-number location were 3·8 × 106−9·6 × 106 and 2·2 × 106−4·2 × 106 for the smooth sharp tip and rough sharp tip respectively. The local skin-friction data, determined from the Pitot-tube survey, agreed with the heat-transfer data obtained through the modified Reynolds analogy. The tip-bluntness data showed a strong delay in the beginning of transition for a cone base-to-tip diameter ratio of 20, approximately a 35% increase in Reynolds number over that of the smooth sharp-tip case. The angle-of-attack data indicated the cross flow to have a strong influence on transition by promoting it on the sheltered side of the cone and delaying it on the windward side.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 24 , Issue 1 , January 1966 , pp. 1 - 31
Copyright
© 1966 Cambridge University Press

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