Technical Memorandum of National Aerospace Laboratory
巻
321
ページ
22
発行年
1976-11
抄録（英）
Cylindrical inlet noise suppressors for a high-bypass-ratio turbofan engine (FJR710/ 10 ) were tested. Perceived noise level attenuations obtained due to the suppressors were 10 PNdB for simulated approach conditions. Sound power attenuation spectra obtained by an insertion loss technique using far-field measurements also showed a maximum peak attenuation of 10 dB. Degradations of aerodynamic performance caused by the inlet noise suppres- sors were smaller than the experimental errors.
ファンエンジンFJR710による円筒吸入消音ダクトの実機試験
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