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Broadband shock-associated noise of moderately imperfectly expanded supersonic jetsRecently a stochastic model theory of broadband shock-associated noise from supersonic jets was developed. The theory is capable of predicting the near and far field noise spectra of slightly imperfectly expanded jets. In this paper, the noise prediction formulas are extended to the moderately imperfectly expanded Mach number range. It is found that the shock noise intensity depends only on the amplitude of the quasi-periodic shock cell structure and not on the strong first shock. This makes it possible to extend the noise prediction formulas by simply modifying the shock cell strength in the original formulas. Here this step is implemented semiempirically, and a set of shock noise prediction formulas are developed.
Document ID
19900059290
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tam, C. K. W.
(Florida State University Tallahassee, United States)
Date Acquired
August 14, 2013
Publication Date
July 8, 1990
Publication Information
Publication: Journal of Sound and Vibration
Volume: 140
ISSN: 0022-460X
Subject Category
Acoustics
Accession Number
90A46345
Funding Number(s)
CONTRACT_GRANT: NAG1-421
Distribution Limits
Public
Copyright
Other

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