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Stochastic model theory of broadband shock associated noise from supersonic jetsA method based on the work of Tam and Tanna (1982) for calculating the near field noise spectrum and the spatial distribution of broadband shock associated noise from supersonic jets is proposed. Multiple-scales expansion is used to decompose the quasi-periodic shock cells into time-independent waveguide modes of the jet flow, and the interaction of the instability waves with each of the waveguide modes is shown to generate unsteady disturbances which become part of the broadband shock associated noise when radiated to the far field. The observed broadband shock associated noise is composed of a superposition of the various distinct spectra of the different waveguide modes, and the multispectra can be easily identified in many of the existing far and near field noise measurements.
Document ID
19870064795
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 13, 2013
Publication Date
July 22, 1987
Publication Information
Publication: Journal of Sound and Vibration
Volume: 116
ISSN: 0022-460X
Subject Category
Acoustics
Accession Number
87A52069
Funding Number(s)
CONTRACT_GRANT: NAG1-421
Distribution Limits
Public
Copyright
Other

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