Abstract: The analytical formulas about the relations between power density and pressure ratio of an endoreversible Brayton cycle coupled to variable-temperature heat reservoirs were derived using finite-time thermodynamics. In the analysis, the irreversibilities involved the heat resistance losses in the hot- and cold-side heat exchangers. The influences of the thermal conductance distribution of hot-and cold-side heat exchangers and the thermal capacity rate match between the working fluid and the heat reservoirs were studied by the detail numerical examples.

Key words: Heat flow calculation;Brayton cycle;Power density;Parameter optimization

摘要： 计入工质与高、低温侧换热器的热阻损失 ,用有限时间热力学方法 ,导出了变温热源条件下内可逆布雷顿循环功率密度与压比间的解析式 ,借助于数值计算 ,研究了高、低温侧换热器的热导率分配和工质与热源间的热容率匹配对最大功率密度的影响。

关键词: 热流计算;布雷顿循环;功率密度;参数最优化