Abstract
SYNOPSIS The performance of an air-standard Diesel cycle with heat transfer loss and variable specific heats of working fluid is analysed by using finite-time thermodynamics. The relationships between work output and compression ratio, between thermal efficiency and compression ratio, as well as the optimal relationship between work output and efficiency of the cycle are derived by detailed numerical examples. Moreover, the effects of heat transfer loss and variable specific heats of working fluid on the cycle performance are analysed. The results show that the effects of heat transfer loss and variable specific heats of working fluid on the cycle performance are obvious and should be considered in practical cycle analysis. The results obtained in this paper may provide guidance for the design of practical internal combustion engines.
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