Abstract
Normal forces on rectangular flat plates in supersonic, rarefied flow were measured over the range 200 < Re < 2,400 and 3.7 < M < 4.1 at angles of attack up to eight degrees. In addition, the effect of aspect ratio on normal forces was determined with a series of models having an aspect ratio range from 1.0 to 2.0. The results were compared to linearized inviscid theory and indicated normal forces which were 33 per cent to 77 per cent greater than values predicted by theory, the experimental normal forces decreasing with increasing Reynolds Number. The decrease in normal force with decreasing aspect ratios was found to be from 3 to 7 per cent greater in magnitude than predicted by inviscid theory and substantially independent of Reynolds Number over the range tested. Weak interaction theory was used to derive a simple expression for the normal force and was found to predict the order of magnitude of the increased normal force as well as the trend of the normal force with Reynolds Number.
Published Version
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