| The synchronous generator has been considered as one of the most important elements in electrical power system and much attention has been paid to air-cooling turbo-generator 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 research 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, and 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, the end 3-D fluid field solution model of generator is established according to the structure of ventilation cooling system and then the fluid equatins are solved using the finite volume method, by which the fluid flow of winding path can be calculated. Secondly, electromagnetic loss of air-cooling turbo-generator is calculated and analyzed according to electromagnetic theory in the electric machine and all parts losses of generator stator with full-load are also computed. Thirdly, the 3-D fluid and temperature coupled field model of the stator radial ventilation ducts is established according to characteristics of fluid flow and heat transfer. Then coupled equations can be solved using finite volume method according to hypothesis and related boundary conditions, and the fluid velocity and temperature of radial ventilation ducts can be computed. Finally, the temperature field is analyzed and the result is compared with test value. Furthermore, the influence of air-gap flow on the stator coupled field is ayalyzed and some useful conclusions are drawn.
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