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Analyzing regularity of interpolar air motion and heat dissipation coefficient distribution of a salient pole synchronous generator considering rotary airflow
International Communications in Heat and Mass Transfer ( IF 7 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.icheatmasstransfer.2020.104828
Dan Li , Weili Li , Jinyang Li , Xiaoke Liu

Abstract The extreme attention should be paid to cooling performance of air-cooled synchronous generators in order to ensure that the temperature rise of each part is within the allowable range. It is necessary to know losses distribution, cooling airflow rate distribution laws, heat dissipation coefficient distribution and temperature distribution characteristics. Considering the influence of rotary airflow and yoke ventilation duct structure on air motion, the physical parameters and the motion characteristics of interpolar air were analyzed in three cases. These cases were considered respectively when the rotor was in a rotating or non- rotating state and the yoke ventilation ducts were intake air, and when the rotor was in a rotating state and the yoke ventilation ducts were not intake air. Based on Multi-Reference Frame, the finite volume method was used to solve the fluid-solid coupling numerical simulation of the solving domain. Taking a 250 MW air-cooled hydro-generator as an example, the air velocity of each air cooler was measured and the inlet air velocity of the rotor support was calculated. By calculating the average temperature of the excitation winding in the steady state, the measured value and the simulation result were compared, and the correctness of the calculation method was verified.

中文翻译:

考虑旋转气流的凸极同步发电机极间空气运动规律及散热系数分布分析

摘要 风冷式同步发电机的冷却性能应得到高度重视,以保证各部分的温升在允许范围内。需要了解损耗分布、冷却气流速率分布规律、散热系数分布和温度分布特性。考虑旋转气流和轭式通风管道结构对空气运动的影响,分析了三种情况下极间空气的物理参数和运动特性。分别考虑转子处于旋转或非旋转状态且轭通风道为进气时和转子处于旋转状态时轭通风道不进气时的情况。基于多参考框架,采用有限体积法求解求解域的流固耦合数值模拟。以一台250MW风冷式水轮发电机为例,测量了各空冷器的风速,计算了转子支架的进气风速。通过计算稳态时励磁绕组的平均温度,将实测值与仿真结果进行比较,验证了计算方法的正确性。
更新日期:2020-12-01
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