空间热离子反应堆燃料元件力学性能分析程序开发  

Development of mechanical property analysis program forspace thermionic fuel element

作　　者：杨文宇 柴翔[1,2] 朱恩平 刘晓晶 Yang Wenyu;Chai Xiang;Zhu Enping;Liu Xiaojing(College of Smart Energy,Shanghai Jiao Tong University,Shanghai 200240,China;School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学智慧能源创新学院,上海200240 [2]上海交通大学机械与动力工程学院,上海200240

出　　处：《强激光与粒子束》2024年第3期148-157,共10页High Power Laser and Particle Beams

基　　金：国家重点研发计划项目(2020YFB1901900);国家自然科学基金项目(12275175);上海市工业强基计划项目(GYQJ-2018-2-02);上海市启明星计划项目(21QA1404200)。

摘　　要：为了实现对空间热离子反应堆燃料元件运行期间安全性能的预测,研究开发了一种燃料元件力学性能分析程序,并针对多层圆筒状的TOPAZ-Ⅱ热离子燃料元件开展了应力、应变和几何变形的高精度模拟。程序考虑了核燃料在高温辐照环境下的辐照肿胀,并分析了燃料芯块-发射极在发生接触后的力学响应问题,从而快速且准确地求解燃料芯块和发射极的力学状态,以对空间热离子反应堆运行期间的性能提供准确预测。结果表明:在正常运行情况下,空间热离子反应堆燃料会发生显著的肿胀效应,其造成的变形将导致燃料元件热电转换效率降低、元件失效等安全隐患。To predict the safety performance of fuel elements during operation of a space thermionic reactor,this study developed a mechanical performance analysis program for fuel elements,and conducted high-precision simulation of stress,strain,and geometric deformation for the multi-layer cylindrical TOPAZ-II thermionic fuel element.The program takes into account the irradiation swelling of nuclear fuel under high-temperature radiation environment,and analyzes the mechanical response of the fuel pellet-emitter after contact,thereby quickly and accurately solving the mechanical state of the fuel pellet and emitter,to provide accurate prediction of the performance during operation of the space thermionic reactor.The results indicate that in normal operating conditions,the fuel of a space thermionic reactor undergoes significant swelling effects,which causes deformation that can lead to potential safety hazards such as reduced thermal-electric conversion efficiency and component failure.

关 键 词：空间堆 燃料元件 辐照肿胀 力学分析 

分 类 号：TL349[核科学技术—核技术及应用]