Calculation And Analysis Of Temperature And Flow Field In Stator Of Large Air-cooling Turbo-generator

With the development of national economy, the demand for power is increasing, so the construction scales of electricity grid must be upgraded. Air-cooling turbo-generator is more and more popular because of its simple system, convenient start, operation and maintenance. The heat load increases with the increase of capacity, which can influence its life-span and security when running. Therefore, the study of heat and cooling problem on large turbo-generator is very important, which is significant to secure operation of generator.The 200MW air-cooling turbo-generator with multi-path ventilation system is taken as example in the paper, the fluid and temperature field of stator are calculated based on the fluid dynamics theory in order to get the temperature distribution among the generator. Firstly, turbo-generator with Multi-path Ventilation System fluid field solution model of generator is established according to the structure of ventilation cooling system, basic assumptions and boundary conditions of fluid flow and temperature field are given, and then coupled equations can be solved using finite volume method according to hypothesis and related boundary conditions in order to get the fluid velocity and temperature of radial ventilation ducts. According to the result of computation, Temperature distribution of the motor is analyzed. Then, fluid velocity and temperature of radial ventilation ducts are analyzed again, when flux of stator and air-gap are changed and total flow is constant. the result is compared with test value.Based on the studies of the subject, it is concluded that the highest temperature of stator and the difference in the highest and lowest temperature of stator are decreased by air flow increased properly.It provides important theoretical base for design of ventilated structure of Large Air-cooling Turbo-generator.