In a turbofan engine, a type of aircraft turbojet engine, this refers to the ratio of the flow rate between the air that flows through the fan and not through the main engine (bypass air) and the air that flows through the main engine. Around 1960, the bypass ratio was around 0.5 to 1.3, but has now increased to 4 to 6. The larger the bypass ratio, the better the engine's propulsive efficiency at subsonic speeds, the lower the fuel consumption rate at low speeds, and the quieter the engine exhaust noise. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
航空機用ターボジェット・エンジンの一種であるターボファン・エンジンにおいて,ファンだけを流れ,主エンジン内を流れない空気 (バイパス空気) と,主エンジン内を流れる空気との流量比のこと。 1960年頃のバイパス比は 0.5~1.3程度であったが,現在は4~6に増加している。バイパス比が大きいほど,亜音速でのエンジンの推進効率がよく,低速時の燃料消費率が低くなり,またエンジンの排気騒音も低くなる。
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