以变热容气体为工质的不可逆Atkinson热机的优化性能

Optimal performance of an irreversible Atkinson heat engine with the working substance having temperature-dependent heat capacities

建立不可逆Atkinson循环新模型,探索工质变热容、不可逆绝热过程和透过汽缸壁的热漏损失等对热机循环性能的影响.在给定一系列参数值的情况下,绘制出了Atkinson热机的性能特性曲线,得出了如输出功、效率和压强比的优化区间,并讨论了一些重要设计参数对循环性能的影响.

The new model of an irreversible Atkinson heat engine is set up,in which the influence of temperature-dependent heat capacities of the working substance,irreversible adiabatic processes and heat leak losses through the cylinder wall are taken into account.The performance characteristic curves of the Atkinson heat engine are presented for a set of given parameters.The optimum criteria of some important parameters such as the work output,the efficiency and the pressure ratio are given.Moreover,the influence of some important design parameters on the cycle performance is discussed.