Relationship of brake power to various energy efficiencies and other engine parameters: the efficiency rule

摘要: A precise mathematical relationship between the brake power of a piston engine and various energy efficiencies other parameters interest is developed. This equation, called Efficiency Rule for convenience, is: Pb = ηti • ηc ηv ηM LHV FA p D N/X. Similar equations are also developed indicated power, mean effective pressure, specific fuel consumption. These significant several reasons. Most importantly, they physically meaningful, can be used to explain observed characteristics, illuminate methods improving performance. Examples usefulness these presented discussed. It expected that will prove valuable educational research tools.