Abstract
AbstractThe performance of an air standard Diesel cycle with heat transfer loss, friction-like term loss and variable specific heats of working fluid is analysed by using finite time thermodynamics. The relationships between the power output and the compression ratio, between the thermal efficiency and the compression ratio, as well as the optimal relationship between the power output and the efficiency of the cycle are derived by detailed numerical examples. Moreover, the effects of temperature dependent specific heats of working fluid on the irreversible cycle performance are analysed. The results show that the effects of temperature dependent specific heats of working fluid on the irreversible cycle performance are obvious, and they should be considered in practice cycle analysis. The results obtained in the present paper may provide guidance for the design of practice Diesel engines.
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