【摘要】 基于有限时间热力学理论和前人建立的恒温热源闭式Braysson循环模型，以生态学有效功率E_η为目标，研究了循环性能特性，推导出了E_η的表达式。通过数值分析的方法，分析了工质热容率C_wf、工质对数温比x和热导率分配u对■性能的影响，比较了循环工作在最大无因次生态学有效功率■、最大无因次功率■、最大无因次生态学函数■和最大无因次有效功率■条件下的性能差异。研究结果表明：在给定C_wf的情况下，存在最佳的工质对数温比(x_opt)和热导率分配(u_opt)使循环的■达到最大值；在分别给定x和u的情况下，■随着C_wf的增大而减小；当设计目标从其他目标转为■时，可以通过牺牲部分功率换取效率的提升。更多还原

【Abstract】 Based on the finite-time thermodynamic theory and endoreversible closed Braysson cycle model with constant temperature heat reservoirs established in previous literature, this paper studies the cycle performance characteristics with ecological efficient power（E_η） as the objective function. The expression of E_η is derived. Through numerical analysis method, the effects of heat capacity(C_wf) of working fluid, logarithmic temperature ratio（x） of working fluid and thermal conductivity distribution（u） on E_η are analyzed. The performance differences are compared when cycle works under the maximum dimensionless ecological efficient power ■, the maximum dimensionless power ■, the maximum dimensionless ecological function ■ and the maximum efficient power ■ conditions. The results show that there are the optimal logarithmic temperature ratio(x_opt) of working fluid and optimal thermal conductivity distribution(u_opt) to maximize the cycle ■ with the given C_wf. With the given x and u, ■ decreases with the increase of C_wf. When the design objective is changed from other objectives to ■, the efficiency can be improved with the sacrifice of part power.更多还原