Influence of Variable Section Rotor Ventilation Ducts on Temperature and Fluid Fields of a Full Air-Cooled Large Hydro-Generator Rotor
Li Weili1, Li Jinyang2, Li Dan1
1. School of Electric and Engineering Beijing Jiaotong University Beijing 100044 China. 2. School of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001 China
Abstract：Under the long term operation of a full air-cooled hydro-generator, due to the repeated magnetic and thermal stress on the rotor yoke, the rotor yoke ducts are deformed. As the cooling effect of the hydro-generator directly affects the performance and economic indicators. Therefore, it is important to study the influence of the ducts deformation on the a full air-cooled hydro-generator. Taken a 250MW air-cooled hydro-generator as an example, according to the special ventilation structure, the calculation area of the rotor was determined. The three dimensional coupling calculation models of rotor with deformed and normal ducts were respectively established. When the assumed and boundary conditions were given, the finite volume method is used to analyze the ventilation and heat dissipation of a hydro-generator. The regularities of influence of the rotor yoke ducts deformation on the fluid flow state and the excitation winding temperature were analyzed. When the ventilation ducts are normal, the calculation result of the excitation winding average temperature is compared with the measured data, and the method is verified.
李伟力, 李金阳, 李丹. 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[J]. 电工技术学报, 2017, 32(增刊2): 42-49.
Li Weili, Li Jinyang, Li Dan. Influence of Variable Section Rotor Ventilation Ducts on Temperature and Fluid Fields of a Full Air-Cooled Large Hydro-Generator Rotor. Transactions of China Electrotechnical Society, 2017, 32(增刊2): 42-49.
[1] 梁艳萍, 张沛, 陈晶, 等. 1 000MW空冷水轮发电机端部结构件涡流损耗[J]. 电工技术学报, 2012, 27(12): 213-218. Liang Yanping, Zhang Pei, Chen Jing, et al. Eddy current losses of end structures for 1 000MW air-cooled hydro-generator[J]. Transactions of China Elec- trotechnical Society, 2012, 27(12): 213-218. [2] 赵洋, 严波, 曾冲, 等. 大型汽轮发电机定子端部电磁力作用动态响应分析[J]. 电工技术学报, 2016, 31(5): 199-206. Zhao Yang, Yan Bo, Zeng Chong, et al. Dynamic response analysis of large turbogenerator stator end structure under electromagnetic forces[J]. Transactions of China Electrotechnical Society, 2016, 31(5): 199-206. [3] Li W, Wang D. The influence of additional loss on rotor surface heat transfer coefficient and temperature field of large air-cooled hydro-generator[C]//The 14th Biennial IEEE Conference on Electromagnetic Field Computation(CEFC), Chicago, USA, 2010: 1-1. [4] 梁艳萍, 于鸿浩, 边旭. 汽轮发电机三相突然短路故障转子动态电磁力计算[J]. 电工技术学报, 2016, 31(11): 91-96. Liang Yanping, Yu Honghao, Bian Xu. Calculation of dynamic electromagnetic force in the rotor of turbogenerator after three-phase sudden short circuit fault[J]. Transactions of China Electrotechnical Society, 2016, 31(11): 91-96. [5] 丁舜年. 大型电机的发热与冷却[M]. 北京: 科学出版社, 1992. [6] 付强, 满宇光, 卢春莲, 等. 大型电机VPI绝缘体系的关键技术研究[J]. 电气技术, 2016(2): 1-8. Fu Qiang, Man Yuguang, Lu Chunlian, et al. Research on essential technology of large generator VPI insulating system[J]. Electrical Engineering, 2016(2): 1-8. [7] 赵辉, 王亚菲, 王红君, 等. 基于滑模变结构控制的余热发电机机组励磁控制研究[J]. 电力系统保护与控制, 2015, 43(6): 8-13. Zhao Hui, Wang Yafei, Wang Hongjun, et al. Study of waste heat power generation units excitation control based on sliding mode variable structure control[J]. Power System Protection and Control, 2015, 43(6): 8-13. [8] 鲜霄, 寻志伟, 周道军. 大型汽轮发电机运行与无功控制[J]. 电工技术学报, 2015, 30(5): 98-105. Xian Xiao, Xun Zhiwei, Zhou Daojun. Operation and reactive power control of large turbine-generators[J]. Transactions of China Electrotechnical Society, 2015, 30(5): 98-105. [9] 李伟力, 陈玉红, 霍菲阳, 等. 大型水轮发电机转子旋转状态下磁极间流体流动与温度场分析[J]. 中国电机工程学报, 2012, 32(9): 132-139. Li Weili, Chen Yuhong, Huo Feiyang, et al. Fluid flow and temperature field analysis between two poles of a large air-cooled hydro-generator rotor in rotation[J]. Proceedings of the CSEE, 2012, 32(9): 132-139. [10] 温嘉斌, 孟大伟, 周美兰, 等. 大型水轮发电机通风发热场模型研究及通风结构优化计算[J]. 电工技术学报, 2000, 15(6): 1-4. Wen Jiabin, Meng Dawei, Zhou Meilan, et al. Field model research of ventilation and heat and optimal calculation of ventilation structure for large water wheel generator[J]. Transactions of China Elec- trotechnical Society, 2000, 15(6): 1-4. [11] 林亚一. 水轮发电机组的安装与检修[M]. 北京: 中国水利水电出版社, 2000. [12] 程相, 邓源, 罗小兵. 桐子林水电站发电机转子磁轭叠片工艺[J]. 大电机技术, 2016(6): 35-38. Cheng Xiang, Deng Yuan, Luo Xiaobing. Laminated assembly technique of the generators rotor yoke of tongzilin hydropower station[J]. Large Electric Machine and Hydraulic Turbine, 2016(6): 35-38. [13] Versteeg H K, Malalasekera W. An introduction to computational fluid dynamics the finite volume method[M]. An introduction to computational fluid dynamics: 世界图书出版公司, 2000. [14] 李俊卿, 许燕萍, 刘彦丰. 汽轮发电机定子流体场和温度场耦合计算与分析[J]. 大电机技术, 2012(4): 30-34. Li Junqing, Xu Yanping, Liu Yanfeng. Coupled calculation on stator fluid field and temperature field of turbogenerators[J]. Large Electric Machine and Hydraulic Turbine, 2012(4): 30-34. [15] 陶文铨. 数值传热学[M]. 西安: 西安交通大学出版社,2001. [16] John D, Anderson J R. 计算流体动力学入门[M]. 姚朝晖, 周强, 译. 北京: 清华大学出版社, 2010. [17] Klainerman S, Majda A. Compressible and incom- pressible fluids[J]. Communications on Pure & Applied Mathematics, 2006, 35(5): 629-651. [18] Li W, Zhang Y, Chen Y. Calculation and analysis of heat transfer coefficients and temperature fields of air-cooled large hydro-generator rotor excitation windings[J]. IEEE Transactions on Energy Conversion, 2011, 26(3): 946-952. [19] Lü C Y, Liang Y P, Chen J. Calculation of rotor temperature field for huge hydro-generator[C]//The 6th IEEE International Forum on Strategic Technology (IFOST), Harbin, China, 2011: 524-528.
2017, Vol. 32 
