汽轮发电机转子端部及槽内供风量分布特性  

Distribution Characteristic of Air Flow Rate in Rotor End and Inner Slot of Turbo Generator

作　　者：路义萍[1] 阴文豪[1] 李俊亭[2] 韩家德[1] 曹文[2] 

机构地区：[1]哈尔滨理工大学机械动力工程学院,哈尔滨150080 [2]哈尔滨电机厂有限责任公司,哈尔滨150040

出　　处：《电工技术学报》2010年第4期38-43,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50976027);黑龙江省自然科学基金(E200807);黑龙江省教育厅科学研究基金(11541056)资助项目

摘　　要：随着空冷汽轮发电机容量不断增加,线圈尺寸加长,通风系统复杂,转子通风系统属多风路冷却系统。为减小因通风不均引起的轴向温差,本文以某大型空冷汽轮发电机半转子为研究对象,建立两个槽包括径向副槽通风、轴向通风及端部通风的多风路通风结构物理模型,基于计算流体动力学(CFD)原理,运用有限体积法进行三维紊流流场的数值模拟,得出进入转子端部、轴向及副槽通风道的空气量,分析多种结构对转子上述三部分风量分配的影响。针对本体,提出单位绕组轴向长度供风量评价风量分布均匀性。本文的方法及结论对大型电机转子本体部分轴向通风与副槽通风长度优化设计提供理论依据。With the turbo generator’s capacity increasing, the size of rotor coil is lengthened. The ventilation system becomes complicated, and the rotor ventilation system belongs to the multi-path cooling system. In order to reduce axial temperature difference due to the non-uniform ventilation, a physical model of multi-path ventilation structure is presented, combined with a given example of half rotor in the large turbo generator with air cooling; the multi-path ventilation consists of the radial sub slot ventilation, the axial ventilation and the rotor end ventilation. Based on computational fluid dynamics（CFD） principle, the three dimensional turbulent flow field is simulated by finite volume method, and the air mass flow rate of entering rotor end segment, axial ducts and sub slot is obtained. The effect of some structures on the air flow rate distribution of various ventilation segments mentioned above is analyzed. In view of the rotor body, the air flow rate per unit axial length of windings is presented to evaluate the uniformity of ventilation cooling. The method and the conclusion will provide theoretical guidance to the optimization design of the length of the axial and sub slot ventilation of the large generator rotor.

关 键 词：汽轮发电机 转子 多路通风 空气冷却 轴向通风长度优化 

分 类 号：TM311[电气工程—电机]