An investigation of sonic-boom overpressures in water has been conducted by gun-launching small cone-cylinder models over water. Flights were conducted at Mach numbers of 2.7 and 5.7, in air, corresponding to Mach numbers of 0.6 and 1.3, respectively, in water. Shadowgraph pictures and underwater pressure measurements indicate that for horizontal flights at Mach numbers below Mach 4.4 in air (i.e., subsonic relative to the speed of sound in water) the resulting underwater disturbance is an acoustic wave whose peak pressure attenuates rapidly with water depth. In contrast, at supersonic Mach numbers, relative to water, the incident shock wave at the surface is transmitted into the water as a propagating shock wave and the peak pressure associated with it does not attenuate with water depth.
Ballistic range investigation of sonic-boom overpressures in water.
American Institute of Aeronautics and Astronautics, Fluid and Plasma Dynamics Conference ; 1972 ; Boston, MA
1972-06-01
Conference paper
No indication
English
Measurements of sonic-boom overpressures from Apollo space vehicles
Tema Archive | 1974
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