开式布雷顿循环构型对比及优化设计

Comparative Thermodynamic Analysis and Optimization Design of Open Brayton Cycle Configurations

布雷顿循环具有高效、紧凑的特点,适合作为核反应堆热电转换系统。本文基于EBSILON软件建立了简单循环、简单回热循环、再热回热循环和间冷回热循环四种开式布雷顿循环构型的系统仿真模型,对循环关键参数进行热力学分析,以循环效率、功率密度为性能指标进行了循环参数优化,并与闭式布雷顿循环进行了对比分析。结果表明,四种开式循环构型中再热回热循环效率最高,可达25.44%;简单回热循环功率密度最高,可达171.13 k W·m^(-3);将开式循环改进为空冷闭式空气布雷顿循环,最高循环效率提高12.56个百分点,最高功率密度增加11.87 k W·m^(-3)。

The Brayton cycle is characterized by high efficiency and compactness,making it suitable for use in nuclear reactor thermal-electric conversion systems.In the present work,a system simulation model was built based on EBSILON software for four open Brayton cycle configurations:simple cycle,simple regenerative cycle,reheat regenerative cycle,and intercooled reheat cycle,and key parameters were analyzed.The cycle parameters were optimized with the objectives of cycle efficiency and power density,and compared with the closed Brayton cycle.The results revealed that among the four configurations,the reheating and recuperative cycle achieved the highest cycle efficiency at 25.44%,while the simple recuperative cycle demonstrated the highest power density,reaching 171.13 k W·m^(-3).Improving the open cycle into the closed Brayton cycle increased the maximum cycle efficiency by 12.56 percentage points and the maximum power density by 11.87k W·m^(-3).