控制棒驱动机构(control rod driver machanism,CRDM)是反应堆中最重要的组件之一.在工作时CRDM线圈通电产生的热量以及内部高温冷却剂传递的热量会导致其温度过高,造成老化甚至失效.本文以ACP100反应堆为例,对不同环境温度下的CRDM外部流场进行三维数值模拟,得到其外壁面空气温度及对流换热系数.将上述结果作为边界条件分段施加到单根CRDM上,考虑内部冷却剂的自然对流流动对CRDM进行热流固耦合分析.结果表明,CRDM内部沿轴向及由内向外存在较大温度分布梯度;在提升、传递和夹持线圈中夹持线圈温度最高,在不同环境温度下3个线圈温度均小于线圈限制温度.本文提出的温度场分析方法和分析结果可为后续CRDM结构设计及可靠性评估提供参考. Control rod driver machanism (CRDM) is one of the most important components of a reactor, and the heat generated by energizing the CRDM coil during operation and the heat transferred from the internal high-temperature coolant can cause its temperature to rise, causing aging or even failure Taking the ACP100 reactor as an example, the external flow field of CRDM at different ambient temperatures is numerically simulated and the air temperature and the convective heat transfer coefficient are obtained.These results are applied as segmental conditions to a single CRDM, Considering the natural convection flow of internal coolant, the fluid-solid coupling analysis of CRDM was carried out. The results show that there is a large temperature distribution gradient in the CRDM along the axial direction and from the inside to the outside. The temperature of the clamping coil in the lifting, transmitting and clamping coils is the highest, The temperature of the three coils at different ambient temperatures is less than the temperature limit of the coil.The proposed method of temperature field analysis and the analysis results can provide reference for the subsequent design of CRDM structure and reliability evaluation.