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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Brake specific fuel consumption ： ウィキペディア英語版 Brake specific fuel consumption Brake specific fuel consumption (BSFC) is a measure of the fuel efficiency of any prime mover that burns fuel and produces rotational, or shaft, power. It is typically used for comparing the efficiency of internal combustion engines with a shaft output. It is the rate of fuel consumption divided by the power produced. It may also be thought of as power-specific fuel consumption, for this reason. BSFC allows the fuel efficiency of different engines to be directly compared. ==The BSFC calculation (in metric units)== To calculate BSFC, use the formula :$BSFC\; =\; \backslash frac$ where: :''r'' is the fuel consumption rate in grams per second (g/s) :''P'' is the power produced in watts where $P\; =\; \backslash tau\; \backslash omega$ ::$\backslash omega$ is the engine speed in radians per second (rad/s) ::$\backslash tau$ is the engine torque in newton meters (N·m) The above values of ''r'', $\backslash omega$, and $\backslash tau$ may be readily measured by instrumentation with an engine mounted in a test stand and a load applied to the running engine. The resulting units of BSFC are grams per joule (g/J) Commonly BSFC is expressed in units of grams per kilowatt-hour (g/(kW·h)). The conversion factor is as follows: :BSFC () = BSFC ()×(3.6×106) The conversion between metric and imperial units is: :BSFC () = BSFC ()×608.277 :BSFC () = BSFC ()×0.001644 ==The relationship between BSFC numbers and efficiency== To calculate the actual efficiency of an engine requires the energy density of the fuel being used. Different fuels have different energy densities defined by the fuel's heating value. The lower heating value (LHV) is used for internal combustion engine efficiency calculations because the heat at temperatures below cannot be put to use. Some examples of lower heating values for vehicle fuels are: ::Certification gasoline = 18,640 BTU/lb (0.01204 kW·h/g) ::Regular gasoline = 18,917 BTU/lb (0.0122225 kW·h/g) ::Diesel fuel = 18,500 BTU/lb (0.0119531 kW·h/g) Thus a diesel engine's efficiency = 1/(BSFC × 0.0119531) and a gasoline engine's efficiency = 1/(BSFC × 0.0122225) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Brake specific fuel consumption」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.