摘要
为了提高大型汽轮发电机温度场计算的精度,提出采用混合单元(混合坐标系)计算电机温度场的方法。根据传热学和流体力学的基本原理,建立汽轮发电机定子三维温度场的数学模型;采用热平衡原理对定子温度场的偏微分方程进行离散化处理,形成电机的等效热网络。给出采用混合单元对电机进行网格划分的方法,并推导了不同坐标系下热导的求解方法,进而给出采用等效热网络方法求解定子温度场的非线型方程组。将其应用于一台QFSN-200-2型汽轮发电机定子温度场的计算,并将计算结果与实测值进行了比较,结果表明所提出的方法是正确可行的。
In order to increase the calculating precision of temperature field of turbo-generators, the method is proposed in which the temperature field of generators is calculated by dual elements （in other words in dual coordinate systems）. In accordance with the theory of heat transfer and fluid mechanics, the stator 3D temperature field model of turbo-generators was established. The partial differential equations of stator temperature field model were dispersed with thermal equilibrium theory and as a consequence their equivalent thermal net was obtained. Mesh division method and the thermal conductivity expression in dual coordinate systems were represented. Thus the non-linear equations about stator temperature field were obtained by equivalent thermal net method. These methods have been used for the calculation of stator 3D temperature distribution in QFSN-200-2 turbo-generators operating on different loads. The results show that the model and calculation methods are correct.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第18期78-82,共5页
Proceedings of the CSEE
基金
河北省自然科学基金项目(08B005)
关键词
汽轮发电机
定子
温度场
混合单元
等效热网络
turbo-generators
stator
temperature field
dual elements
equivalent thermal net
