【摘要】 介绍了多孔介质(PM)发动机的工作过程及其PM回热循环的热力学理想模型.用有限时间热力学方法分析了PM回热循环的性能,导出了考虑传热效率下循环功与效率的关系及最大功输出时的效率界限,并给出了较详尽的数值计算结果,讨论了与燃烧和传热相关的参数对功效特性的影响.这对实际多孔介质发动机性能的评估和改进有重要的指导意义.更多还原

【Abstract】 Working processes of the porous medium combustion engine,called "PM-engine",are briefly introduced and the ideal thermodynamic model of PM heat regeneration cycle is presented.Finite-time thermodynamic analysis is applied to evaluate the thermodynamic performance of the PM-engine.A relation between net work and efficiency is derived for the cycle taking into account the efficiency of heat transfer.The maximum net work output and the corresponding efficiency bound of the cycle are determined.Detailed numerical results are given,and effects of parameters relevant to engine combustion on the cycle are also discussed.The results obtained herein provide a significant guidance to the performance evaluation and improvement for practical PM-engines.更多还原