Preliminary engineering designs of nacelle acoustical treatments applicable to jet transports have been studied to suppress compressor noise; concepts involved application of narrow-band resonators and wide-band acoustical absorbers to walls of fan-discharge and inlet ducts; broadband resonator concept for duct lining was developed; tests evaluated inlets with light-bulb-shaped centerbodies to provide narrower duct dimensions and increased surface area; tests determined flow resistance and absorption coefficient of various duct-lining treatment configurations; inlet and fan-discharge duct lining design recommendations for JT3D engine series are made which use broadband resonator concept. (06906)
Study of turbofan-engine compressor-noise-suppression techniques
NASA CR
NASA Contractor Reports ; n 1056
1968
174 pages
Report
Englisch
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A study turbofan-engine compressor-noise-suppression techniques
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