屏蔽电机内冷却循环流场及水力损失数值研究  

Numerical study on circulating flows and hydraulic losses in canned motor

作　　者：郭苗 刘宇[1] 唐学林[2] 刘树红[3,4] 左志钢[3,4] 李小芹[2] GUO Miao;LIU Yu;TANG Xuelin;LIU Shuhong;ZUO Zhigang;LI Xiaoqin(School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing 102206,China;College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]华北电力大学水利与水电工程学院,北京102206 [2]中国农业大学水利与土木工程学院,北京100083 [3]清华大学水圈科学与水利工程全国重点实验室,北京100084 [4]清华大学能源与动力工程系,北京100084

出　　处：《水力发电学报》2024年第10期53-62,共10页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金项目(52279084,51909132);中央高校基金项目(2024MS065)。

摘　　要：本文采用RNG k-ε湍流模型对一屏蔽电机内部流动进行数值模拟,同时运用多孔介质模型及Ergun方程计算近似电机定子区域内流动,最终构建了基于能量守恒定律的水力损失分析理论模型,揭示了屏蔽电机内部水力损失演化过程,并结合相应流场现象进行了分析。计算结果表明,转子与多孔介质两者间隙内流体成螺旋形流动,同时较大的多孔介质阻力将导致冲击水流在此间隙前出现多个轴对称漩涡;推力轴承径向流道间的进口处出现类似叶片绕流的轴对称漩涡,同时推力轴承外流场还存在强环流;研究结果揭示了复杂的几何结构会导致产生较多漩涡,且造成较大水力损失,尤其是在推力轴承与滑动轴承间。以上计算结果可为相似电机内部冷却循环流动开展相关几何参数和结构优化提供一定参考。In this work,a RNG k-εturbulence model is used to simulate the flows inside a canned motor,and flows in its stator section are calculated using a porous media model and the Ergun equation.We construct a theoretical model for hydraulic loss analysis based on energy conservation,and use it to reveal the time evolution of the motor’s hydraulic loss.Flow patterns are analyzed in details.The results show that spiral flow patterns occur in the gap between the rotor and porous medium,and the impacting water flow forms multiple axisymmetric vortices in this gap,which are attributed to the larger resistance in the porous medium.Near the thrust bearing,some axisymmetric vortices similar to the blade flow are located at its radial flow channel inlet,and high-vorticity circulating flows develop in the flow outside of it.These findings suggest a complex geometric structure may result in more vortices and cause a significant hydraulic loss,especially between the thrust bearings and sliding bearings.This study would be a useful reference for optimizing the geometric parameters and structure of related motors.

关 键 词：多孔介质流 水力损失 漩涡 推力轴承 屏蔽电机 

分 类 号：TM761[电气工程—电力系统及自动化]