NASA NTRS · 19730003292
Quiet engine nacelle design
Abstract
Reduction 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.
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Nelsen, M. D.. 1972-01-01. Quiet engine nacelle design. https://ntrs.nasa.gov/citations/19730003292
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