【摘要】 基于发动机热力循环变温吸热和放热的特点,建立了内可逆变温换热循环的有限时间热力学模型,推导出性能的计算式,以及循环功率与热效率的制约关系,并给出了性能优化的条件.应用这些优化条件,可以确定发动机的工作参数,从而获得最优性能.模型考虑了发动机实际循环工质吸、放热过程温度变化的因素,比现有的等温换热循环有限时间热力学模型更接近实际循环,模拟精度更高.模型适用于各种发动机的热力循环.更多还原

【Abstract】 On the basis of characteristics of engine thermodynamic cycles,a finite-time thermodynamic model for endo-reversible variable temperature heat exchange cycle was built.The performance formulas and the restrictive relation between cycle power and thermal efficiency were derived and the optimum conditions for the performance were determined.The engine working parameters were determined by using the optimum conditions and the optimum performance indices were given.The temperature change factor in heat exchange process of engine practical cycle was considered in the model.The model is more approximate to the practical cycles and is more accurate in simulation than that of the present finite-time thermodynamic constant temperature models.The model can be applied to all varieties of engine thermodynamic cycles.更多还原