大型空冷汽轮发电机定子内流体速度与流体温度数值计算与分析

Calculation and Analysis of Fluid Velocity and Fluid Temperature in Large Air-cooled Turbo-generator Stator

随着空冷汽轮发电机设计制造技术和工艺水平的提高,发电机单机容量不断增大,但由于相同体积的冷却介质,空气冷却能力较氢气和水相差较大,且空冷发电机的风摩损耗较大,因此定子温升及定子内通风系统的流场研究对保证空冷发电机高效、可靠和安全的运行具有重要意义。文中根据计算流体力学理论,应用有限体积法对定子通风沟流体速度和温度进行计算与分析。基于多元流计算的温度场结果与实测结果进行比较,说明该方法的正确性。计算了通风沟内不同风速在流体的速度和温度,并进行比较,得出一些有益的结论。

Design, manufacture technology and technological level in air-cooling turbo-generator have been improved increasingly, so unit capacity is increasingly enlarged. However, because the cooling capability of air is rather less than that of hydrogen gas or water at the same volume of cooling medium, and wind friction loss is rather larger, so researching on temperature field and ventilation system in the stator plays an important part in guaranteeing high effective, reliable and secure operation. According to the theories of the computational fluid dynamics, this paper applies the Finite Volume Method to compute the multidimensional fluid velocity and temperature distribution inside stator radial ventilation ducts. By comparing the result on the basic of fluid field with the measured value, this method is testified correctly. Some useful conclusions are achieved.