一种电机气隙内泰勒涡流流动及传热特性  

Research on Taylor Vortex's Flow and Heat Transfer Characteristics of the Air Gap of the Motor

作　　者：韩家德[1] 赵博敏 路义萍[1] HAN Jia-de;ZHAO Bo-min;LU Yi-ping(School of Mechanical and Power Engineering,Harbin University of Science and Technology,Harbin 150080,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

出　　处：《哈尔滨理工大学学报》2018年第2期114-119,共6页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金(50976027);哈尔滨市科技创新人才基金项目(2013RFXXJ032)

摘　　要：为研究轴向通风冷却的异步电机运行时在定转子间的气隙产生的泰勒涡流对气隙的流动换热情况产生重要影响,以异步电机定转子间气隙的结构尺寸创建光壁、定子侧带凹槽、转子侧带凹槽三种简化物理模型,基于有限体积法和计算流体动力学理论,利用Fluent软件对气隙内的涡旋流动及传热特性进行数值模拟。结果表明:定转子侧凹槽的存在将流场分为了两部分,位于凹槽内的流体流速较小,位于主流区域内的流体,流场分布与光壁模型的流场分布相似,整体上凹槽的存在使壁面平均努塞尔数变大,换热增强。数值模拟泰勒涡流平均努塞尔数计算结果与同类实验关联式结果相比,误差为7.3%。结论对异步电机结构及冷却系统的设计具有参考价值。Taylor Couette flow will produce in the air gap which lies between the stator and the rotor when the asynchronous motor applying axial ventilation system runs.This secondary flow will have a significant impact on flow and heat transfer conditions of the air gap.Three kinds of simplified air gap models are created including the smooth air gap model,the air gap model with grooves in the stator side and the air gap model with grooves in the rotor side according to the structure size of the air gap for some asynchronous motor.Based on Computational Fluid Dynamics Principle and Finite Volume Method,vortex’s flow and heat-transfer characteristic in the air gap is numerically simulated by using Fluent software.The results show that the flow field is divided into two parts because of the existence of the grooves in both the stator and rotor side.The velocity of the fluid in the grooves is low relatively and flow field distribution of the mainstream area is similar to that in the smooth air gap model.On the whole,the existence of the grooves makes the Nusselt number bigger and enhances the heat transfer.Compared with the experimental correlations of the same type,the calculation error of numerical simulation of Taylor vortex’s average Nusselt number is 7.3%.The conclusions have reference value for the design of structure and cooling system of motor.

关 键 词：泰勒涡流 数值模拟 光壁模型 凹槽模型 努塞尔数 

分 类 号：TM341[电气工程—电机]