浸润式与强迫内冷结合的蒸发冷却汽轮发电机定子三维温度场计算

汽轮发电机定子采用浸润式与强迫内冷结合的新型蒸发冷却技术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,相应地有必要对定子温度场进行准确的计算分析以满足进一步应用的要求。该文以1台应用该冷却系统运行的50MW汽轮发电机的定子为研究对象,首次建立了较完整的定子三维温度场的仿真数学模型,采用数值模拟与试验对比分析的方法,对定子绕组内冷、负荷变化以及冷凝器工况等因素对电机温度场的影响进行了研究,得到了新型蒸发冷却电机定子温度场的分布规律。仿真结果与试验数据吻合较好,为蒸发冷却技术在大型汽轮发电机中的进一步应用提供了理论依据。

Calculation of 3D Thermal Field in the Stator of Turbo-generator with Immersion Evaporative-cooling System and Forced Inner-cooling

The new type of evaporative cooling technique combined with inner cooling system used in the stator of turbo-generator has ascendancy over other traditional cooling methods.It offers a more safe,more reliable and effective result of insulation and cooling.So it is worthy to have a deep research on temperature distribution calculating for more application.Based on analysis of a 50MW turbo-generator stator with the new evaporative cooling system,a complete simulation model in three dimensions for temperature calculating of the stator was developed for the first time.Effect on the temperature distribution of stator concerned with the change of load,inner cooling of stator winding and capacity of condenser was also analyzed by numerical simulation and tests. Distribution rule of stator temperature field has been obtained and result of simulation was tested agree well with experiment. Conclusion of this paper can be provided as academic foundation for more application in design and manufacture high-capacity turbo-generator with evaporative cooling system.