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Effects of heat transfer, friction and variable specific heats of working fluid on performance of an irreversible dual cycle

机译：工作流体的传热，摩擦和可变比热对不可逆双循环性能的影响

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摘要

The thermodynamic performance of an air standard dual cycle with heat transfer loss, friction like term loss and variable specific heats of working fluid is analyzed. The relations between the power output and the compression ratio, between the thermal efficiency and the compression ratio, as well as the optimal relation between power output and the efficiency of the cycle, are derived by detailed numerical examples. Moreover, the effects of variable specific heats of the working fluid and the friction like term loss on the irreversible cycle performance are analyzed. The results show that the effects of variable specific heats of working fluid and friction like term loss on the cycle performance are obvious, and they should be considered in practical cycle analysis. The results obtained in this paper may provide guidance for the design of practical internal combustion engines.
机译：分析了空气标准双循环的热力学性能，该热循环具有传热损失，像项损失这样的摩擦和工作流体的可变比热。通过详细的数值例子推导了功率输出与压缩比之间的关系，热效率与压缩比之间的关系以及功率输出与循环效率之间的最佳关系。此外，分析了工作流体的可变比热和诸如术语损耗之类的摩擦对不可逆循环性能的影响。结果表明，工作流体的可变比热和诸如损耗之类的摩擦对循环性能的影响是显而易见的，应在实际循环分析中予以考虑。本文获得的结果可为实际内燃机的设计提供指导。

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