Accession Number:

AD0432130

Title:

RAREFIED HIGH-TEMPERATURE, ULTRAHIGH MACH NUMBER SLIP FLOW OVER A SHARP FLAT PLATE,

Descriptive Note:

Corporate Author:

GENERAL ELECTRIC CO SCHENECTADY N Y

Report Date:

1963-04-01

Pagination or Media Count:

39.0

Abstract:

An investigation was conducted in a hypersonic shock tunnel to determine the induced pressures and the local heat transfer rates for a flat plate with sharp leading edge. The free stream Mach number range was 7.95 to 25.1 with stagnation temperatures of approximately 2300 and 7000 R. For these temperatures and Mach number conditions, the strong interaction parameter, varied from 2.35 to 826 and the corresponding Knudsen numbers, based on the ratio of the free stream mean free path and the leading edge thickness, varied from 0.4 to 86. For free stream Mach numbers greater than 10, Knudsen numbers of approximately unity, and perfect gas conditions, the observed experimental induced pressures varied as the square root of the strong interaction parameter and the local heat transfer rates varied as the cube root of the strong interaction parameter to the fourth power as predicted by the noninsulated flat plate theory of Li and Nagamatsu. When the Knudsen number and the Mach number are much greater than 1, the leading edge slip phenomenon drastically reduced both the induced pressures and local heat transfer rates as compared to the theoretical values predicted with no slip at the surface. Schlieren photographs indicate the presence of slip flow at the sharp leading edge in that the formation of the strong shock wave and the boundary layer was delayed. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE