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Sound attenuation by liners in a blown flap environmentSound propagation through a hot wall-jet flow over an absorbing wall is studied. The radiated sound field subject to the influence of flow convection and refraction is evaluated, and the nature of acoustic attenuation attributable to a sound absorbing liner is determined. Using a two-dimensional model, the noise field under the aircraft is also determined, and a slug-flow model is used to describe the influence of flow, density, and temperature on acoustic sources in jets. Results show significant changes in the radiated source due to the interference phenomenon, and a good absorber has the potential of changing the sound pressure range of variation to unity. A liner is also found to increase or decrease sound pressure, depending on the frequency.
Document ID
19810061955
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Parthasarathy, S. P.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Vijayaraghavan, A.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1980
Subject Category
Acoustics
Meeting Information
Meeting: International Conference on Noise Control Engineering
Location: Miami, FL
Start Date: December 8, 1980
End Date: December 10, 1980
Accession Number
81A46359
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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