不可逆Braysson热机的功率密度优化

Power Density Optimization of an Irreversible Braysson Heat Engine

用有限时间热力学方法优化了恒温热源条件下不可逆Braysson热机的功率密度,指出了其兼顾较高功率和较高效率时压比及高温侧热导率的取值范围,并发现功率密度较大、同时也使热机相应的功率和效率较高时,高温侧换热器的热导率要大于低温侧换热器的热导率。本研究结果可为实际Braysson热机的优化设计提供理论依据。

Finite-time thermodynamics was applied to optimize the characteristic of an irreversible Braysson heat engine＇s dimensionless power density. The range of the compression ratio and the hot-side heat exchanger＇s conductance was illustrated respectively while both the engine＇s power and efficiency were at a relatively high level. Also, to obtain a relatively high power density, power and efficiency, the hot-side heat exchanger＇s heat conductance ratio were bigger than the cold-side heat exchanger＇s. The results provided a valuable guidance for designing a real Braysson heat engine.