大型水-氢-氢冷汽轮发电机通风系统的计算及端部通风流道变化对结构件温度的影响  

Calculation of Ventilation Systems and Influence of Ventilation Duct Area on Temperature of Copper Shield in the End Region of Large Water-hydrogen-hydrogen Cooled Turbo-generators

作　　者：李伟力[1] 周醒夫[2] 霍菲阳[1] 李勇[3] 韩继超[2] 

机构地区：[1]北京交通大学电气工程学院,北京市海淀区100044 [2]哈尔滨理工大学电气与电子工程学院,黑龙江省哈尔滨市150080 [3]北京北重汽轮电机有限责任公司,北京市石景山区100161

出　　处：《中国电机工程学报》2013年第21期109-116,199,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51077031)~~

摘　　要：根据330 MW大型水–氢–氢冷汽轮发电机通风结构的特点,建立了半个轴向段电机的通风网络模型,采用流体网络方法计算得到电机运行时的总风量、各通风沟和进风室的风量和压力。为了验证流体网络方法计算的准确性,给出了端部区域内的流体与传热耦合三维数学模型,以流体网络计算出的压力和风速作为给定汽轮发电机端部求解域中的边界条件,采用有限体积法计算了铜屏蔽的温度分布,将耦合场计算结果与电机实测结果进行比较,误差满足工程要求。在此基础上,对电机端部区域内铜屏蔽和压圈之间的通风流道面积进行调整,在电机额定运行下,分析调整后铜屏蔽温度的变化,为大型汽轮发电机结构设计提供了可靠的依据。According to the features of ventilation structure in 330 MW water-hydrogen-hydrogen cooled turbo-generator,the ventilation network model of half axial section was built,the total flow,the flow and the pressure of the ventilation ducts and the wind chambers were obtained with the fluid network method.To validate the accuracy of calculation with fluid network method,three-dimensional flow-heat transfer coupling model of end region was established.The flow velocity and the pressure from the ventilation system calculations were applied to the physical model of end region as boundary conditions,the distribution of the temperature on the copper shield was obtained with the finite volume method under rated operating conditions.Comparing the calculated temperature results with the test values,the errors meet the engineering requirement.Based on these,the change of temperature on the copper shield was analyzed by adjusting the flowing area of the ventilation duct between the copper shield and the press plate.All of the aforementioned will provide an effective basis for designing the structure of a large turbo-generator accurately.

关 键 词：汽轮发电机 水–氢–氢冷却 流体网络 三维端部区域模型 流体场与温度场 

分 类 号：TM301[电气工程—电机]