氨/氙混合比例对布雷顿循环系统动态特性的影响分析

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关键词：空间气冷堆；布雷顿循环；动态特性

中图分类号：TM613文献标志码：A

DOI：10.7652/xjtuxb202509021 文章编号：0253-987X（2025）09-0220-13

Abstract： To address the issue of deviation from the design value of the working fluid mixture ratio due to leakage or uneven charging during the operation of a space gas-cooled reactor coupled with a helium-xenon Brayton cycle system， which in turn affects the safety and stability of the system，this study establishes a dynamic model of the space gas-cooled reactor-coupled heliumxenon Brayton cycle system based on the Simulink platform. This model includes the reactor core，turbine，compressor，regenerator，cooler，and radiator. By setting diferent molar masses of the helium-xenon mixed working fluid （50±5）g/mol ，the model simulates the dynamic response characteristics of key parameters of the cycle system under external reactive step disturbances. The results show that when the working fluid's molar mass deviates to 45g/mol ， the system's cycle efficiency decreases by 1.4% ，the average convective heat transfer coeficient within the reactor increases by 12.9% ，and the system’s response time is shortened by 6.8% （204号 compared to the designed mixture ratio under reactive steps. Conversely，when the working fluid's molar mass deviates to 55g/mol ，the cycle efficiency increases by 0.78% ，the average convective heat transfer coefficient within the reactor decreases by 16.8% ，and the system’s response time is extended by 4.9% . The findings can provide references for the safe operation and control strategies of space nuclear power systems.

Keywords： space gas-cooled reactor;Brayton cycle;dynamic characteristics

相较于传统能源，小型模块化反应堆因其能量密度高、所占空间体积小以及运行维护量少等优点，在深空探索领域展现出了极大的优势[1-2]。（剩余17283字）