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一、前言 自从CA效率导出以来,许多有限时间热力学结论是由活塞式热机模型得出的。这些结论,不能象经典热力学结论那样都适用于工质以定常态连续流方式工作的热机。活塞式热机模型的工质被活塞封闭于气缸中完成循环,工质吸,放热通过同一面积,诸过程完成于不同时间。而后者,构成循环的工质各过程是于不同的装置中同时完成的,当分析工质同热源间的传热不可逆性对热机循环的影响时,讨论工质吸、放热的不同传热面积很重要。本文在作者原来工作的基础上,定义了特征参数φ,ε,ι,用φ=φ(t,ε)讨论了定常态能量转换热机仅有工质与热源间传热不可逆性时,各种工况下的功率、效率、面积之间的关系,为实际热机的面积选择提供理论依据。
I. INTRODUCTION Since the export of CA efficiency, many finite-time thermodynamic conclusions have been drawn from the piston thermal model. These conclusions can not be applied to the heat engine in which the working fluid works in the steady state continuous flow as the classical thermodynamic conclusions do. Piston heat engine model of working fluid is closed in the cylinder piston to complete the cycle, working fluid suction, heat through the same area, the process is completed at different times. In the latter case, the processes that make up the circulating working fluid are performed simultaneously in different devices. When analyzing the influence of the irreversible heat transfer between the working fluid and the heat source on the thermal cycle, the different heat transfer Area is important. Based on the original work of the author, the paper defines the characteristic parameters φ, ε, ι and discusses the irreversibility of the heat transfer between the working fluid and the heat source in the steady state energy transfer heat machine with φ = φ (t, ε) The working conditions of the power, efficiency, the relationship between the area for the actual heat engine area to provide a theoretical basis.