大型水轮发电机温度场与热应力分析  

Analysis of Temperature Field and Thermal Stress of Large Hydro-generator

作　　者：寇攀高[1] 李超顺[2] 李如海[2] 魏巍[2] 

机构地区：[1]国网湖南省电力公司电力科学研究院,湖南长沙410007 [2]华中科技大学水电与数字化工程学院,湖北武汉430074

出　　处：《水电能源科学》2017年第3期163-166,共4页Water Resources and Power

摘　　要：近年来水轮发电机的单机发电容量愈来愈大,水轮发电机的电磁负荷和热负荷也随之增加,研究大型水轮发电机的电磁分析、温度与热应力尤为重要。以某大型水轮发电机组为例,采用ANSYS-Rmxprt组件建立某大型水轮发电机的等效模型,再通过ANSYS的Maxwell2D仿真模块对水轮发电机电磁有限元模型进行瞬态电磁场分析,分别求解水轮发电机定子系统在空载和额定负载两种工况下产生的铜耗及铁耗。然后建立水轮发电机定子系统三维结构模型并导入电磁损耗密度进行电磁稳态温度场耦合分析,求解水轮发电机定子系统在空载和额定负载工况下的温度分布。最后将温度场分析与结构热力学分析耦合,求解水轮发电机热应力分布,为降低大型水轮发电机工作温升和预防结构热应力变形提供理论依据。In recent years,the capacity of single generator becomes larger and larger,and the electromagnetic load and heat load of the hydro-generator are increasing.Therefore,it is important to study of electromagnetic field,temperature and thermal stress of large hydro-generator.Taking a large hydro-generator as the research objects,ANSYS-Rmxprt component was used to build equivalent model of large hydro-generator.And then the electromagnetic model is analyzed by ANSYS Maxwell 2Dmodule in transient electromagnetic field.The copper loss and iron loss of stator system were calculated under no-load and rate-load conditions of hydro-generator.Three-dimensional model of hydro-generator stator system was established and the temperature distribution of the stator of the generator with electromagnetic loss was analyzed.Finally,coupling the temperature field analysis and structural analysis,the thermal stress distribution of hydro-generator was obtained.Thus it provides theoretical basis for reducing the working temperature of large hydro-generator and prevention mechanism of the thermal stress deformation.

关 键 词：水轮发电机 电磁损耗 电磁场 温度场 热应力 

分 类 号：TV734.2[水利工程—水利水电工程]