Abstract
The effect of highly-blunted nose shapes at different angles of attack on the resultant side force is studied in the low supersonic region. Methods to reduce the side force on blunted bodies are also studied by testing the shapes of the nose section. Six force-components of cylindrical models about 400 mm in length with various bluff nose shapes were measured in the velocity region M-infinity = 1.4-2.5 at angles of attack 0-32 deg in the 1 x 1 m supersonic wind tunnel of the National Aerospace Laboratory. A side-force coefficient C(Y), of the order of 1, and the coefficients ratio of C(Y)/C(N), of the order of 0.2-0.6, are observed on these bluff-blunted cylindrical bodies. Roughness simulated by free grooves on the nose sections of blunted bodies increases the side force; however, rough grooves and a circumferential single groove somewhat reduce it. (Author)
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