Abstract

Calculations have been made of the theoretical limits of engine efficiency for various fuels. Considered were methanol, ethanol, benzene, iso-octane, ethane and methane. The ideal Otto cycle was used for the calculations, since it represents the upper limit for fast-burn adiabatic engines. At the conditions explored, small differences in thermodynamic cycle efficiency of under 2 per cent exist among the various fuels. These differences can be explained by the thermodynamic properties of the fuel/air mixtures themselves.

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