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Investigation of refracting flows for acoustic suppressionAn experimental program to determine the possibility of using refracting flows for the suppression of aircraft inlet noise has been completed. Observations of wave behavior in accelerating duct flows have suggested that acoustic wave refraction could be used to direct inlet noise away from the ground upward to where it causes less annoyance. Measurements have also shown that acoustic wave refraction can cause large improvements in the effectiveness of acoustic lining material.
Document ID
19770055744
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sloan, D. (Boeing Commercial Airplane Co. Seattle, WA, United States)
Purves, R. B. (Boeing Commercial Airplane Co. Seattle, WA, United States)
Farquhar, B. W. (Boeing Commercial Airplane Co. Seattle, Wash., United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1977
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 77-920
Meeting Information
Meeting: Propulsion Conference
Location: Orlando, FL
Country: US
Start Date: July 11, 1977
End Date: July 13, 1977
Sponsors: Society of Automotive Engineers, American Institute of Aeronautics and Astronautics
Accession Number
77A38596
Distribution Limits
Public
Copyright
Other

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