高速电机定转子小间隙强迫风冷却数值模拟
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摘要
采用计算流体动力学方法进行了定转子小间隙三维热流耦合计算,分别考虑了定子槽、轴向冷却流,以及转速对风摩擦损耗的影响,并获得了转子表面对流换热系数。结果表明:定子槽和轴向流会使得风摩擦损耗增大;有轴向流时,对流换热系数在入口处最高,在出口处最低;轴向冷却流的对流换热效果要远大于其造成的损耗发热效果。研究结果为转子热设计提供了重要参考依据。
A thermal-flow coupling calculation of stator-rotor narrow gap 3 D model was carried out by computational fluid dynamics method in the paper. The effects of stator slots,axial cooling flow and rotational speed on the windage loss were taken into account respectively,and the rotor surface heat transfer coefficients were obtained. It shows that the windage loss will increase due to stator slots and axial cooling flow. For the case with an axial cooling flow,the rotor surface heat transfer coefficient is the highest at the entrance and the lowest at the exit,and the heat elimination effect of the axial cooling flow surpasses the heating effect brought by itself. Results provide a reference for the thermal design of rotor.
A thermal-flow coupling calculation of stator-rotor narrow gap 3 D model was carried out by computational fluid dynamics method in the paper. The effects of stator slots,axial cooling flow and rotational speed on the windage loss were taken into account respectively,and the rotor surface heat transfer coefficients were obtained. It shows that the windage loss will increase due to stator slots and axial cooling flow. For the case with an axial cooling flow,the rotor surface heat transfer coefficient is the highest at the entrance and the lowest at the exit,and the heat elimination effect of the axial cooling flow surpasses the heating effect brought by itself. Results provide a reference for the thermal design of rotor.
引文
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[2] COLES D. Transition in circular couette flow[J]. Journal of Fluid Mechanics,1965,21(3):385-425.
[3] FENSTERMACHER P R,SWINNEY H L,GOLLUB J P. Dynamical instabilities and the transition to chaotic Taylor vortex flow[J].Journal of Fluid Mechanics,1979,94(1):103-128.
[4] KING G P,LI Y,LEE W,et al. Wave speeds in wavy Taylor-vortex flow[J]. Journal of Fluid Mechanics,2016,141(1):365-390.
[5] Sébastien Poncet,Sofia Haddadi,Stéphane Viazzo. Numerical modeling of fluid flow and heat transfer in a narrow Taylor-Couette-Poiseuille system[J]. International Journal of Heat and Fluid Flow,2011,32(1):128-144.
[6] HAYASE T,HUMPHREY J A C,GREIF R. Numerical calculation of convective heat transfer between rotating coaxial cylinders with periodically embedded cavities[J]. Journal of Heat Transfer,1992,114(3):589-597.
[7] GARDINER S R M,SABERSKY R H. Heat transfer in an annular gap[J]. International Journal of Heat and Mass Transfer,1978,21(12):1459-1466.
[8] KUOSA M,SALLINEN P,LARJOLA J. Numerical and experimental modelling of gas flow and heat transfer in the air gap of an electric machine[J]. Journal of Thermal Science,2004,13(3):264-278.
[9] KUOSA M,SALLINEN P,REUNANEN A,et al. Numerical and experimental modelling of gas flow and heat transfer in the air gap of an electric machine. Part II:grooved surfaces[J]. Journal of Thermal Science,2005,14(1):48-55.
[10] FENOT M,BERTIN Y,DORIGNAC E,et al. A review of heat transfer between concentric rotating cylinders with or without axial flow[J]. International Journal of Thermal Sciences,2011,50(7):1138-1155.
[11] WANG F,ZHANG D,XING J,et al. Study on air friction loss of high speed PM machine[C]//IEEE International Conference on Industrial Technology,2009.
[12] ZHANG D H,WANG F X,KONG X G. Air friction loss calculation of high speed permanent magnet machines[C]//International Conference on Electrical Machines and Systems,2008.
[13]邢军强,王凤翔,张殿海,等.高速永磁电机转子空气摩擦损耗研究[J].中国电机工程学报,2010,30(27):15-19.
[14]汪远林,窦满峰.高功率密度永磁同步电动机散热设计及热场分析[J].微特电机,2013,41(5):23-31.
[15]庄礼贤,尹协远,马晖扬.流体力学[M]. 2版.合肥:中国科学技术大学出版社,2009.
[16] LARJOLA J,LINDGREN O,VAKKILAINEN E. Pienoisvoimalashk9teollisuuden ja laivojen hukkalmm9st(in Finnish)[R].Finnish:Lappeenranta university of technology,1990:246.
[17]曹君慈,李伟力,程树康,等.复合笼条转子感应电动机温度场计算及相关性分析[J].中国电机工程学报,2008,30(28):96-103.