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研究定常态恒温热源热机循环性能，导出内可逆卡诺热机和布雷顿热机的最佳功率、效率关系和最大功率及相应的效率界限，并对这两种热机循环的最优性能进行了比较。理论分析表明，只有当工质的热容率趋于无穷大时，布雷顿循环才能达到卡诺循环的性能。数值计算显示，当布雷顿循环的工质热容率为高、低温侧换热器的热导率总量的1．5倍时，布雷顿循环的功率已为卡诺循环功率的99％以上。
The heat cycle performance of steady state constant temperature heat source is studied. The optimal power, efficiency relationship, maximum power and corresponding efficiency limit of the internal reversible Carnot engine and the Brayton heat engine are deduced. The optimal performance of the two heat engine cycles is compared. The theoretical analysis shows that the Brayton cycle can achieve the Carnot cycle performance only when the heat capacity of the working fluid tends to infinity. Numerical calculations show that the Brayton cycle power is at least 99% of the Carnot cycle power when the heat capacity of the Brayton cycle is high and the thermal conductivity of the low temperature side heat exchanger is 1.5 times the total .