1000 MWe核反应堆冷却剂泵多场耦合特性分析

为研究高温、高压介质对反应堆冷却剂泵的影响，应用商业计算软件ANSYS Workbench对其进行多场耦合数值模拟计算，得到核主泵内部流场、温度场及应力场分布。计算结果表明：类球形压水室不利于流体流动，内部流动十分复杂并存在明显回流。叶轮前盖板温度明显高于后盖板，前盖板平均温度达到530 K，而后盖板只有500 K。应力集中大都发生在前后盖板与叶片交接处，叶轮的等效应力最小值位于叶轮的后盖板轮毂侧，而最大值出现在叶轮出口与前后盖板交接位置；由于叶轮出口处叶片间的约束较小，而此处产生的热应力及离心力所产生的拉应力较大，使得叶轮出口后盖板处产生最大变形，为0.24 mm。

Multiple Field Coupling Analysis of Performance in Coolant Pump of 1 000 MWe Reactor

In order to analyze the influence of the high temperature and high pressure coolant on reactor coolant pump, the multiple field coupling numerical simulation of nuclear main pump was done by the ANSYS Workbench software, and the distributions of flow field, temperature field and stress field were obtained. The results show that orbicular pump undermines the fluid flow, and internal flow is complex and obvious backflow exists. The temperature of front coverplate is obviously higher than that of the back coverplate, and the average temperature of front coverplate reaches to 530 K, while the back coverplate is only 500 K. Stress concentration appears at the junction between the front coverplate and the blade, and the minimum equivalent stress of the impeller occurs on the hub side of the back coverplate. The maximum stress occurs at the junction between the coverplate and the outlet of the impeller. The constraints between impeller blades at impeller outlet are weaker while the thermal stress and the tension stress produced by the centrifugal force are bigger, which results in the maximum deformation of the impeller at back coverplate to be 0.24 mm.