Abstract
To investigate the blast loads from the guns of military aircraft, a 7.62-mm caliber rifle was fired in the RAE 3-ftx3-ft wind tunnel over the speed range from A/ = 0 to 1.8, and over a wide range of static pressures. The blast wave arrival times and the local static pressure ratios were measured by transducers mounted on an adjacent plate, offset at spacings of 10, 20, and 30 calibers. These measurements generally were well correlated by Smith's theory, both with respect to the variation of speed and pressure. However, downstream of the muzzle, discrepancies between the measurements and the theory increased with speed, particularly when the plate was closest to the gun. Shock-wave/boundary-layer interaction occurred between the blast wave and the plate, but had a minor influence on the blast loadings upstream of the muzzle.
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