湍流模型变化对汽轮发电机转子热流场影响  

Effect of turbulence models on temperature and flow field for turbo-generator rotor

作　　者：路义萍[1] 潘庆辉 孙雪梅[1] 韩家德[1] 

机构地区：[1]哈尔滨理工大学机械动力工程学院,黑龙江哈尔滨150080

出　　处：《电机与控制学报》2014年第11期72-77,共6页Electric Machines and Control

基　　金：国家自然科学基金(50976027)

摘　　要：以某大型空冷汽轮发电机转子为例,建立了包括护环在内的半转子风路最长的线圈整槽三维物理模型,基于计算流体动力学原理,采用有限体积法,在相同的计算条件、网格划分前提下,研究了3种不同的湍流两方程模型——Standard k-ε模型、Realizable k-ε模型和RNG k-ε模型对转子三维流场和温度场的影响。结果表明:采用不同湍流模型对转子温度分布及峰值位置计算结果影响显著,RNG k-ε模型计算的温度结果偏高,Standard k-ε模型计算的温度结果偏低,Realizable k-ε模型计算出的温度结果更接近实际情况。结论可为大型空冷汽轮发电机转子数值模拟提供理论参考。The whole three-dimensional physical model of single coil of the longest ventilation duct of half a rotor was establised when protective ring and a large air-cooled turbine generator rotor was taken as an example. Finite volume method was used to study three models of different turbulent two equation——Standard k-ε model,Realizable k-εmodel,RNG k-ε model——impacting on three dimensional flow field and temperature field of the rotor,according to the computational fluid dynamics method with the same rated conditions and meshing. The results show that,the results of rotor temperature distribution and peak position are significantly affected by using different turbulent model——temperature calculated with RNG k-ε model is higher,temperature calculated with Standard k-εmodel is lower,temperature calculated with Realizable k-ε model is close to reality. The total air volume of the rotor is not significantly affected with different models,while the influence on the flow distribution in the air duct is greater. The conclusion provides theoretical references for numerical simulation of large air-cooled turbo generator rotor.

关 键 词：湍流模型 空冷汽轮发电机 转子 温度场 数值模拟 

分 类 号：TM311[电气工程—电机]