Abstract: As one of the key components of magnetic confinement fusion reactors, the divertor components must withstand highly cyclic heat, mechanical loads, and neutron irradiation, which will have a significant impact on the divertor lifetime and thus affect the actual operational safety of the fusion reactor. In this paper, structural,heat transfer and thermal fatigue analyses are carried out using the flat-type KW/ODS-Cu/RAFM divertor module,which is more suitable for the fusion reactor environment under the high heat flux of 20 MW·m⁻². The temperature and stress-strain distributions of the divertor module are obtained, and based on Manson-Coffin formula, the thermal fatigue lifetime of the divertor module is calculated. The simulation results indicate that under high heat flux of 20 MW·m⁻² and corresponding cooling conditions, the structure, heat transfer performance,and thermal fatigue resistance of the flat-type divertor meet the design requirements, which can provide data reference and engineering experience for the subsequent research of fusion reactors.

Key words: Divertor, Numerical simulation, 20 MW·m?2, Manson-Coffin, Thermal fatigue lifetime

摘要： 偏滤器作为磁约束核聚变堆的关键部件之一，必须承受高循环的热、机械载荷以及中子辐照，这将对其寿命产生巨大的影响，进而影响聚变堆的实际运行安全。选择较适合聚变堆环境的平板型 KW/ODS-Cu/RAFM 偏滤器模块，在 20MW·m⁻² 高热负荷作用下对其进行了结构、传热和热疲劳分析，得到了该偏滤器模块的温度以及应力应变分布，并根据Manson-Coffin 公式计算出该模块的热疲劳寿命。模拟结果表明，在 20 MW·m⁻² 高热负荷和对应的冷却条件下，该平板型偏滤器的结构、传热性能和抗热疲劳性能均满足设计要求，可为聚变堆后续研究提供数据参考和经验支持。

关键词: 偏滤器, 数值模拟, 20 MW·m?2, Manson-Coffin, 热疲劳寿命