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Prediction of sonic boom at a focusThe behavior of sonic boom at a focus has been reviewed for the purpose of extending present sonic boom computational methods to include focal zones. The geometry of a focal zone - whether a smooth caustic, a cusped caustic, or a perfect focus to a point - determines the character of focused signatures. The seeming contradiction of various experimental data can be resolved by noting these differences. A ray acoustic analysis has been developed for quantitative determination of caustic geometry. The only reliable theory presently available for signatures at a focus is for a smooth caustic. There has been some controversy between theoretical and experimental values of a constant in the scaling law for this case. It has been found that this discrepancy can be resolved by accounting for the finite thickness of real sonic boom shock waves. These findings have been incorporated into an existing sonic boom computer program.
Document ID
19760035761
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Plotkin, K. J.
(Wyle Research Laboratories, Inc. Silver Spring, Md., United States)
Cantril, J. M.
(Wyle Laboratories, Inc. Huntsville, Ala., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 76-2
Meeting Information
Meeting: Aerospace Sciences Meeting
Location: Washington, DC
Start Date: January 26, 1976
End Date: January 28, 1976
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
76A18727
Funding Number(s)
CONTRACT_GRANT: NAS8-31166
Distribution Limits
Public
Copyright
Other

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