小堆核主泵屏蔽电机热态额定工况热流场分析  

Analysis of thermal and flow field of a canned motor for small nuclear reaction main pump at thermal rated condition

作　　者：艾丽昆 路义萍[1] 索文旭[3] 韩家德 谢增林[3] AI Li-kun;LU Yi-ping;SUO Wen-xu;HAN Jia-de;XIE Zeng-lin(School of Mechanical amd Power Engineering,Harbin University of Science and Technology,Harbin 150080,China;School of Mechanical and Electronic Engineering,Qiqihar University,Qiqihar 161000,China;Harbin Electric and Power Equipment Co.,Ltd,Harbin 150040,China)

机构地区：[1]哈尔滨理工大学机械动力工程学院,黑龙江哈尔滨150080 [2]齐齐哈尔大学机电工程学院,黑龙江齐齐哈尔161000 [3]哈尔滨电气动力装备有限公司,黑龙江哈尔滨150040

出　　处：《电机与控制学报》2022年第6期83-90,共8页Electric Machines and Control

基　　金：黑龙江省省属高等学校基本科研业务费科研项目(135509110)。

摘　　要：提出了一种小堆用核主泵屏蔽电机冷却结构,其特点是一二次冷却水上方进入,定子绕组上下端腔间外绕螺旋管换热器。热态额定工况是屏蔽电机新产品必须完成的二次水断供5分钟测试试验前的稳态工况,对该工况下的热流场分布规律反演研究,对电机热安全非常重要。首先,选取核主泵整体为研究对象(电机、外绕的螺旋管换热器及下方主泵连接件三部分),建立了计算域几何模型;然后,采用有限体积法,在热态额定工况条件下,模拟计算了三维旋转间隙流流场及温度场,得到基于高压的一二次冷却水热物性参数下的摩擦压降值、定转子间隙处冷却水与固体的温度分布特征。结果表明:测点位置温度模拟结果与试验数据误差小于-4.88%,计算结果较准确;换热器所在电机中部,二次水和电机机壳、间隙水等温度自上而下基本为线性升高,为同类电机的水冷循环回路设计提供参考。A canned motor cooling structure for nuclear main pumps for small reactors is proposed. Its characteristics are that the primary and secondary cooling water inlet is located above, and the casing between the stator end cavities is wound with a spiral heat exchanger. The thermal rated condition is the steady state before the test of the secondary water cutoff for 5 minutes that must be completed for the new product of the canned motor. The inversion study of the thermal and flow field distribution law under this condition is very important for the thermal safety of the motor. First, the nuclear main pump was selected as the research object(the motor, the spiral tube heat exchanger and the main pump connection below), and the geometric model of the calculation domain was established. Then, using the finite volume method, the flow field and temperature field of the three-dimensional rotating clearance were simulated under the rated thermal condition, and the friction pressure drop value and the temperature distribution characteristics of the cooling water and solid at the stator and rotor clearance were obtained based on the thermophysical properties parameters of primary and secondary water at high pressure. The results show that the error between the temperature simulation results at the measuring point and the test data is less than-4.88%, and the results are more accurate. In the middle of the motor where the heat exchanger is located, the temperature of the secondary water, the motor casing, and the clearance water basically rises linearly from top to bottom along axial direction, which provides a reference for the design of the water-cooling circulation circuit of similar motors.

关 键 词：屏蔽电机 数值模拟 旋转间隙流 一次水温升 机壳 轴承热安全 

分 类 号：TM311[电气工程—电机]