摘要
为了研究用耦合网络模型替代有限元模型来节约计算时间和内存空间,本文针对三峡发电机定子局部铁心段分别建立了计及轴向、周向热传导的非线性热-流体耦合网络模型和基于热-流体耦合单元的三维非线性有限元温度场模型。采用这两种模型计算了多种工况下的温度分布,并用统计方法对两者温度计算结果的偏差作对比分析,结果表明两种模型的计算结果是接近的;且与实测值也比较接近,说明两种模型的有效性。前者的计算时间和内存空间比后者大为减少,且随着模型解算规模的增加并没引起计算结果偏差的增加。该方法为以耦合网络模型代替有限元模型来求解具有复杂的冷却结构的大型发电机全定子温度场提供理论基础。
In order to save the calculating time and memory, this paper researches into substituting thermal-liquid coupled network model for FEM model. On the basis of same principle of modeling, the nonlinear thermal-liquid coupled network model of stator＇s partial core taking account of the axial-/circle-direction of heat transfer and the 3D nonlinear FEM model of stator＇s partial core with thermal-liquid coupled element are built respectively. With statistic method, the results of temperature distribution of several typical ranges of unit stator core section in several conditions calculated by using two models are analyzed and compared. It is shown that the calculation accuracy of the two models is close. Meantime, the calculation results of two models are in or close to the range of real-running data. But the former＇s calculating time and memory is far less than the latter＇s. With the increasing of solution scale, the errors between the two models are not raised. So, substituting thermal-liquid coupled network mode/for FEM mode/ gives the theory foundation of calculating the thermal field of large generator＇s whole-stator with complicated cooling structure.
出处
《电工技术学报》
EI
CSCD
北大核心
2008年第7期1-8,共8页
Transactions of China Electrotechnical Society
关键词
热-流耦合网络模型
三维有限元模型
计及轴向周向热传导
定子局部温度场
Thermal-liquid coupled network model, 3D FEM model, with the axial-/circle-heat transfer, thermal field of partial stator
