浸润式混合强迫内冷的蒸发冷却汽轮发电机定子三维温度场的仿真分析

汽轮发电机采用定子浸润与强迫内冷的蒸发冷却方式优越于传统的其它冷却方式,可以为电机的运行提供安全、可靠和高效的绝缘及冷却效果,相应的温度场分析计算值得深入研究.本文以一台50MW汽轮发电机的定子为研究对象,首次提出了完整的采用铁芯浸润式与强迫循环绕组内冷结合的蒸发冷却电机的定子三维温度场的仿真计算模型,并分析了负荷变化以及定子绕组内冷对电机温度场的影响,对仿真计算与试验的结果进行了对比分析,为更大容量蒸发冷却汽轮发电机的设计、制造提供了理论依据.

Simulation of 3D temperature distribution of immersion evaporative cooling turbo-generator combined with forced inner cooling system

Evaporative cooling Combined with inner-cooling system used in turbo-generator has ascendancy over other traditional cooling methods. It offers a more safe, reliable and effective result of insulation and cooling. So it is worthy to have a deep research in temperature distribution calculation. Based on analysis of a 50MW turbo-generator which has been run successfully for ten years, a complete simulation model in three dimensional for temperature calculating of the state with evaporative cooling core and forced inner cooling coil winding has been established for the first time. Effect on the temperature distribution of stator concerned with the change of load and inner cooling of stator coil winding has also been analyzed by numerical simulation. Result of simulation has been tested by experimented investigations and coincides well with experiment. Analysis of this paper should be provided as academic foundation for design and manufacture turbogenerator of higher capacity with evaporative cooling system,