@techreport{oai:jaxa.repo.nii.ac.jp:00043904, author = {渡辺, 実 and 鳥崎, 忠雄 and 武田, 克己 and 小林, 紘 and 関根, 静雄 and 中山, 晋 and 吉田, 晃 and 越沼, 威 and 松田, 幸雄 and WATANABE, Minoru and TORISAKI, Tadao and TAKEDA, Katsumi and KOBAYASHI, Hiroshi and SEKINE, Shizuo and NAKAYAMA, Susumu and YOSHIDA, Akira and KOSHINUMA, Takeshi and MATSUDA, Yukio}, month = {Nov}, note = {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., 資料番号: NALTM0321000, レポート番号: NAL TM-321}, title = {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}, year = {1976} }