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Published November 30, 2015 | Submitted
Report Open

A Preliminary Experimental Investigation of the Flow over Simple Bodies of Revolution at M=18.4 in Helium

Abstract

An experimental investigation was conducted in the GALCIT hypersonic blow-down tunnel to determine surface pressure distributions and shock wave shapes for a series of "sharp"-nosed and slightly-blunted bodies of revolution at a nominal Mach number of 18.4 and a free stream Reynolds number of 6.20 x 10^5 per inch. The four bodies investigated were as follows: (1) 15° half-angle "sharp" cone; (2) 15° half-angle spherically-blunt cone (bluntness ratio= .24); (3) 20° half-angle "sharp" cone; (4) 2/3-power body. The pressure distributions on the "sharp" cones agreed well with the Taylor-Maccoll theory. As expected, the pressure near the nose of the blunt cone was much higher than predicted by this theory, but the pressure decreases monotonically to a value lower than the theoretical value on the conical skirt, indicating that the flow has over-expanded. The measured shock wave shape for the 2/3-power body was found to be proportional to x^(0.69), and the shock wave ordinates agree closely with those predicted by Cole and by Kubota and Lees. Measured surface pressure distributions on the 2/3-power body are predicted satisfactorily by the Kubota-Lees analysis. A simple correction for boundary layer growth accounts for most of the increase in pressure on the rear portion of the body over the values predicted by inviscid theory.

Additional Information

Army Ordnance Contract No. DA-04-495-Ord-19. Army Contract No. 5B0306004 Ordnance Project No. TB3-0118 OOR Project No. 1600-PE.

Attached Files

Submitted - A_Preliminary_Experimental_Investigation_of_the_Flow_Over_Simple_Bodies_of_Revolution.pdf

Files

A_Preliminary_Experimental_Investigation_of_the_Flow_Over_Simple_Bodies_of_Revolution.pdf

Additional details

Created:
August 19, 2023
Modified:
January 13, 2024