空气布雷顿循环系统不同构型参数分析及优化

The air Brayton cycle technology exhibits a high level of maturity and strong environmental adaptability, making it a promising candidate for further selection and design in the context of portable and micro-scale power energy conversion systems. This study establishes a closed-loop air Brayton cycle system model to investigate the influence of key parameters in different cycle configurations on system performance. Parameter optimization is conducted with objectives of maximizing cycle efficiency and maximizing power density for various configurations. The results indicate that the use of inter-stage cooling and reheating can enhance the system's electricity generation efficiency and thermodynamic efficiency, but it leads to an increase in system volume, resulting in reduced power density. When maximizing electricity generation efficiency is the optimization objective, the optimal configuration is the reheating intercooling Brayton cycle, which achieves an electricity generation efficiency of 37.95%, albeit with a lower power density of only 206.9kW/m³. On the other hand, when maximizing power density is the optimization goal, the optimal configuration is the simple reheating cycle, which achieves a power density of 336.7kW/m³ with a compact heat exchanger volume of only 4.36m³ but at the cost of lower electricity generation efficiency, standing at 29.4% compared to other configurations. Consequently, the simple reheating air Brayton cycle, optimized for maximum power density, is better suited for application in portable and micro-scale nuclear power energy conversion systems.