实际闭式中冷回热燃气轮机循环功率优化

考虑循环过程中的热阻损失、内不可逆性以及管路系统压力损失,研究了变温热源条件下中冷回热燃气轮机循环性能,借助数值计算,得到了输出功率最大时高低温侧换热器、回热器和中冷器的热导率最佳分配和最佳中间压比。对总压比进行优化后,得到了双重最大功率。进一步寻求工质与热源热容率最佳匹配,得到了循环的三重最大功率。

POWER OPTIMIZATION OF A REAL CLOSED INTERCOOLED REGENERATED GAS TURBINE CYCLE

The power optimization for a real closed intercooled regenerated gas turbine (Brayton) cycle coupled to variable-temperature heat reservoirs is studied by using finite-time thermodynamics. In the analysis, the irreversibilities involve the heat resistance in four heat exchangers (the hot- and cold-side heat exchangers, the regenerator and the intercooler), the irreversible compression and expansion losses in the compressor and the turbine, and the pressure losses in the piping are taken into account. The optimal intercooling pressure ratio and the heat conductance distributions among the four heat exchangers at the maximum power are obtained by detailed numerical examples. Double maximum power is obtained by optimizing the total pressure ratio. Finally, the heat capacity ratio between working fluid and heat reservoir is also optimized for the thrice-maximum power.