…The output of a propulsion engine is expressed in horsepower or kW for the former, and in thrust (unit: kgf) for the latter. In the latter case, thrust is the sum of momentum thrust, which is the product of the mass flow rate of the fluid and the velocity increase, and pressure thrust, which is the product of the internal and external pressure difference at the nozzle outlet and the nozzle outlet area. Propeller thrust is the momentum thrust of the air passing through its rotational surface, which is the product of the flow rate and the velocity increase. … *Some of the terminology that refers to "pressure thrust" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…推進原動機の出力は,前者では馬力またはkWで,後者では推力(単位kgf)で表される。また後者の場合,推力は流体の質量流量と速度増加値との積である運動量推力と,ノズル出口部における内外圧力差とノズル出口面積との積である圧力推力との和となる。プロペラ推力はその回転面を通る空気の運動量推力で,流量と速度増加との積となる。… ※「圧力推力」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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