...In turbojet engines, jet noise is the largest source of noise, but in high bypass turbofan engines, fan noise (rotational noise) is greater, so noise generation is reduced by increasing the spacing between the moving blades and the stationary blades, and by lining the inner and outer peripheral walls of the flow passages, such as before and after the fan and after the turbine, with resonant sound-absorbing panels such as perforated honeycomb panels to reduce noise radiation. *Some of the terminology that mentions "ramjet engine" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…ターボジェットエンジンではジェットによるジェットノイズがもっとも大きい騒音源であるが,高バイパス比ターボファンエンジンではファンやタービンより発するファンノイズ(回転ノイズ)のほうが大きいので,動翼・静翼間の間隔を離すなどして騒音発生を減らすとともに,ファンの前後やタービン後などの流路の内・外周壁に,孔あきハニカムなどの共鳴型吸音板を張り騒音の放射を低減する。 ※「ramjet engine」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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