定子通风槽钢对通风沟内流体流动形态的影响

Influence of stator ventilation channel on fluid flow pattern inside ventilation duct

为了研究通风槽钢近轴端的径向位置对通风沟内流体流动形态的影响,依据计算流体力学理论,以YKK400-6、690kW中型高压异步电机为例,建立高压异步电机三维定转子径向通风沟物理模型和数学模型,给出相应的基本假设和边界条件,并进行数值计算和分析,得到了径向通风沟内三维流体场分布。在定子通风槽钢长度不变的基础上,改变定子通风槽钢近轴端的径向位置,通过分析定子通风沟绕组两侧流体的流动特性,得到定子通风槽钢近轴端的径向位置对流体流动形态的影响。计算结果表明,通风槽钢的径向位置直接影响定子绕组的冷却效果。研究结果为电机通风结构优化设计提供了理论依据,并为基于耦合场求解温度场奠定了基础。

In order to study the influence of radial position of ventilation channel peri-axle terminal on fluid flow pattern,according to the theory of computational fluid dynamic（CFD）,a YKK400-6、690kW medium size high voltage asynchronous motor was taken as an example.Its 3D stator and rotor radial duct physical and mathematical model were created,and basic assumptions and boundary conditions were determined according to CFD theories.The fluid fields were calculated and analyzed,and fluid field distribution inside radial ventilation duct is shown.Based on the length of the stator ventilation channel as a constant,the radial position of the stator ventilation channel peri-axle terminal was changed.The fluid flow characteristics on both sides of the winding within the stator ventilation duct was analyzed,and the influence of the radial position of the stator ventilation channel peri-axle terminal on fluid flow characteristics was obtained.The result shows that radial position of ventilation channel peri-axle terminal directly affects the cooling effect of stator winding.It can provide theoretical basis for the optimization design of motors ventilation system,and pave the way for solving temperature field based on coupled field.