ramjet engine

Japanese: ramjet engine(英語表記)ramjetengine
ramjet engine

...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.
[Ramjet engine]
When the Mach number becomes large at supersonic speeds, the optimum pressure ratio corresponding to the maximum temperature of the cycle can be obtained by inlet ram compression alone. Taking advantage of this, a jet engine that uses only ram compression at the inlet and does not require a compressor or a turbine to drive the compressor is called a ramjet engine (Figure 3).

*Some of the terminology that mentions "ramjet engine" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…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。
[ラムジェットエンジンramjet engine]
 超音速でマッハ数が大きくなると,取入口ラム圧縮のみでそのサイクル最高温度に対応する最適圧力比が得られる。これを利用して圧縮は取入口におけるラム圧縮のみで行い,圧縮機および圧縮機駆動用のタービンをなくしたジェットエンジンがラムジェットエンジンである(図3)。…

※「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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