大功率空冷汽轮发电机多风区流域内流型演变特性研究  

Investigation of Flow Pattern Evolution Characteristics inside Fluid Domain of Multi-ventilation Region for Large Scale Air-cooled Generator

作　　者：丁树业 江欣 朱敏 刘玮 DING Shu-Ye;JIANG Xin;ZHU Min;LIU Wei(School of Electrical and Automation Engineering,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]南京师范大学电气与自动化工程学院,南京210023

出　　处：《工程热物理学报》2020年第5期1199-1206,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51277045)。

摘　　要：为了阐明大型空冷汽轮发电机内部流体流动特性,进而获取有效冷却效果,以一台350 MW大型空冷汽轮发电机为例,根据该发电机多风路通风系统结构特征以及基本假设,选取整机1/4流体域作为流体场数值研究求解域,在给出相应的求解条件的基础上,采用有限体积法对电机稳态运行时空冷系统的三维流体场进行数值研究。在验证流体场数值研究正确的前提下,分别对发电机定转子径向通风道以及转子副槽等空间内流体场冷却介质的流量以及速度等流体参数进行了分析,揭示了大型空冷汽轮发电机多风区通风系统内的流型演变规律,为该类型发电机通风结构的设计以及性能优化提供了理论参考。In order to clarify the fluid flow characteristics inside large air-cooled turbo generator and obtain effective cooling effect,a 350 MW large air-cooled turbo generator is taken as an example.According to the structural characteristics and fundamental assumptions of the multipath ventilation system of the generator,the 1/4 fluid domain of the whole machine is selected as the numerical solved region of the flow field.On the basis of the corresponding solving conditions which are given,the threedimensional fluid field of the air-cooled system in steady-state operation of the motor is numerically studied by using the finite element method.Under the premise of verifying the correctness of the numerical study of the fluid field,the flow and flow velocity parameters of the cooling medium in the space of the generator such as the radial ventilation ducts of stator,the radial ventilation ducts of rotor and the sub-slot ventilation ducts of rotor are analyzed.The flow pattern evolution law of cooling medium which is in the multipath ventilation system of the large air-cooled turbo generator is revealed,by which a theory for design of ventilation structure and performance optimization for this type generator.

关 键 词：空冷汽轮发电机 有限体积法 通风结构 流体场 流动特性 

分 类 号：TM311[电气工程—电机]