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Ballistic range investigation of sonic-boom overpressures in water.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.
Document ID
19720050414
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Malcolm, G. N.
Intrieri, P. F.
(NASA Ames Research Center Moffett Field, Calif., United States)
Date Acquired
August 6, 2013
Publication Date
June 1, 1972
Subject Category
Aircraft
Report/Patent Number
AIAA PAPER 72-654
Meeting Information
Meeting: American Institute of Aeronautics and Astronautics, Fluid and Plasma Dynamics Conference
Location: Boston, MA
Start Date: June 26, 1972
End Date: June 28, 1972
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
72A34080
Distribution Limits
Public
Copyright
Other

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