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Quiet engine nacelle designReduction of fan noise emanating from turbofan engines by using acoustically treated nacelles is considered. Test performance prediction for an acoustically lined nacelle having a three ring inlet, a single ring fan duct, and external cowling expect a 15 PNdb fan noise reduction with 5 percent takeoff thrust loss and a 5.4 percent cruise specific fuel consumption increase.
Document ID
19730003292
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Nelsen, M. D. (Boeing Co. Seattle, WA, United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1972
Publication Information
Publication: NASA. Lewis Res. Center Aircraft Engine Noise Reduction
Subject Category
Aircraft
Accession Number
73N12019
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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IDRelationTitle19730003285Collected WorksAircraft Engine Noise Reduction
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