Analysis of the Impact of Helium-Xenon Mixture Ratio on the Dynamic Characteristics of the Brayton Cycle Systems

LIU Tao; ZHANG Yan; LENG Yuyang; SONG Meihui; CHEN Weixiong

doi:10.7652/xjtuxb202509021

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Analysis of the Impact of Helium-Xenon Mixture Ratio on the Dynamic Characteristics of the Brayton Cycle Systems

更新时间：2025-09-11

- Analysis of the Impact of Helium-Xenon Mixture Ratio on the Dynamic Characteristics of the Brayton Cycle Systems
- Journal of Xi’an Jiaotong University Vol. 59, Issue 9, Pages: 220-232(2025)
- 作者机构：
  
  西安交通大学能源与动力工程学院， 710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202509021
  CLC： TM613
- Received：12 January 2025，
  
  Online First：09 April 2025，
  
  Published：10 September 2025
- 稿件说明：
移动端阅览
LIU Tao, ZHANG Yan, LENG Yuyang, et al. Analysis of the Impact of Helium-Xenon Mixture Ratio on the Dynamic Characteristics of the Brayton Cycle Systems[J]. Journal of Xi’an Jiaotong University, 2025, 59(9): 220-232.
DOI：

LIU Tao, ZHANG Yan, LENG Yuyang, et al. Analysis of the Impact of Helium-Xenon Mixture Ratio on the Dynamic Characteristics of the Brayton Cycle Systems[J]. Journal of Xi’an Jiaotong University, 2025, 59(9): 220-232. DOI： 10.7652/xjtuxb202509021.

摘要

针对空间气冷堆耦合氦氙布雷顿循环系统运行过程中，因工质泄漏或充气不均匀引发的工质混合比例偏离设计值，进而影响系统的安全性以及稳定性的问题，基于Simulink平台，搭建了涵盖气冷堆堆芯、透平、压缩机、回热器、冷却器以及散热器的空间气冷堆耦合氦氙布雷顿循环系统动态模型，通过设定不同的氦气与氙气混合工质的摩尔质量（50±5）g/mol，模拟了外部反应性阶跃扰动下循环系统关键参数的动态响应特性。结果表明：当工质摩尔质量偏离至45 g/mol时，系统循环效率下降1.4%，堆内平均对流换热系数提高12.9%，面临反应性阶跃，系统的响应时间相较于设计混合比下缩短6.8%；而工质摩尔质量偏离至55 g/mol时，循环效率上升了0.78%，堆内平均对流换热系数下降16.8%，系统的响应时间延长了4.9%。研究结果可为空间核动力系统的安全运行以及控制策略提供参考。

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 helium-xenon Brayton cycle system based on the Simulink platform. This model includes the reactor core

turbine

compressor

regenerator

cooler

and radiator. By setting different 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 45 g/mol

the system's cycle efficiency decreases by 1.4%

the average convective heat transfer coefficient within the reactor increases by 12.9%

and the system's response time is shortened by 6.8% compared to the designed mixture ratio under reactive steps. Conversely

when the working fluid's molar mass deviates to 55 g/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.

关键词

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references

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