变截面转子通风沟对全空冷水轮发电机转子温度场和流体场的影响

发布时间：2018-06-07 18:32

本文选题：全空冷水轮发电机 + 转子　；参考：《电工技术学报》2017年S2期

【摘要】：在全空冷水轮发电机长期运行下,由于转子磁轭长期反复地受到磁应力和热应力的作用,造成了转子磁轭通风沟结构的形变。由于全空冷水轮发电机的冷却效果直接影响了电机的性能和经济指标,因此研究转子磁轭通风沟结构的形变对全空冷水轮发电机的影响十分重要。本文以一台250MW全空冷水轮发电机为例,根据该电机特殊的通风冷却结构,确定转子旋转情况下的计算区域,并分别建立在转子磁轭通风沟结构发生形变和未发生形变时的转子三维流体-温度场的耦合计算模型。在给定相应的基本假设条件与边界条件下,采用有限体积法对全空冷水轮发电机的通风和散热问题进行计算与分析。重点研究转子磁轭通风沟结构形变对磁极间隙内空气流动速度和温度以及励磁绕组温度的影响,并得出相应的变化规律。同时,在转子磁轭通风沟结构未发生形变时,将转子励磁绕组平均温度的计算结果与实测数据进行对比来验证方法的正确性。
[Abstract]:Under the long-term operation of an air-cooled hydrogenerator, the rotor yoke is subjected to the effect of magnetic stress and thermal stress repeatedly for a long time, which results in the deformation of the ventilation ditch structure of the rotor yoke. Since the cooling effect of an air-cooled hydrogenerator has a direct impact on the performance and economic index of the generator, it is very important to study the deformation of the rotor yoke ventilation ditch structure on the all-air-cooled hydrogenerator. In this paper, taking a 250MW fully air-cooled hydrogenerator as an example, according to the special ventilation cooling structure of the motor, the calculation area under rotor rotation is determined. The coupled fluid-temperature field of the rotor with and without deformation in the ventilation ditch structure of the rotor yoke is established respectively. Given the corresponding basic assumptions and boundary conditions, the finite volume method is used to calculate and analyze the ventilation and heat dissipation of an air-cooled hydrogenerator. The influence of rotor yoke ventilation ditch structure deformation on air flow velocity, temperature and excitation winding temperature in magnetic pole gap is studied, and the corresponding variation law is obtained. At the same time, the calculation results of the average temperature of the rotor excitation winding are compared with the measured data to verify the correctness of the method when the ventilation ditch structure of the rotor yoke is not deformed.
【作者单位】：北京交通大学电气工程学院;哈尔滨工业大学电气工程学院;
【基金】：国家自然科学基金资助项目(51477049、51477005)
【分类号】：TM312

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