恒温热源条件下实际回热式布雷顿循环的功率密度优化

计人工质与高、低温侧换热器和回热器的热阻损失、压气机和涡轮机中不可逆压缩和膨胀损失及管路系统中的压力损失,用有限时间热力学方法,导出了恒温热源条件下实际回热式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、低温侧换热器和回热器的热导率分配对最大功率密度的影响。

Power Density Optimization of Real Regenerated Brayton Cycles Coupled withConstant-temperature Heat Reservoirs

Analytical formulas about the relations between power density and pressure ratio of a real regenerated Brayton cycle coupled to constant - temperature heat reservoirs have been derived from finite-time thermodynamics. In the analysis, the irreversibility involved the heat resistance losses in hot and cold - sides of heat exchanger and regenerator, the irreversible compression and expansion losses in compressor and turbine, and the pressure losses in piping. The influence of thermal conductance distribution of hot and cold - sides heat exchanger and regenerator on the maximum power density has been studied by detail numerical examples.