屏蔽泵冷却循环回路的热流耦合
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摘要
为了研究屏蔽泵冷却循环回路与泵内部温升关系,模拟计算了屏蔽电动机内部温度场与压力场的分布以及冷却循环回路中的温升,分析了冷却液与电动机定转子之间的对流换热信息.以冲压成型屏蔽泵实型样机为研究对象,利用工程仿真软件CFD,对屏蔽泵叶轮前后腔体、冷却循环回路等全流场进行热流耦合数值分析.结果表明:屏蔽套间隙内的温升在不同流量工况下温度变化较小,最大温差为0. 97℃;额定流量工况下,轴孔径的大小对屏蔽电动机的温升影响较小.随着轴孔径的逐渐增大,电动机内的最大温度逐渐减小;在额定流量工况下,由屏蔽泵数值与理论计算两种情况的循环流量与轴孔径的关系可以得出:数值计算与理论计算的结果基本一致,研究结果为屏蔽泵冷却循环回路的设计提供理论依据.
To investigate the relationship between cooling cycle loop of canned-motor pumps and the internal temperature rising,the distribution of temperature field and pressure field in the canned-motor and the temperature rise in the cooling circulation loop were simulated and the convective heat transfer information between the coolant and the rotor was analyzed. The thermal-fluid coupling numerical analysis of the whole flow field of the impeller,the chamber and the cooling cycle loop of the canned-motor pump was carried out by using the engineering simulation software CFD based on the real prototype of the stamping-welding canned-motor pump. The results show that under different working conditions,the temperature rise in the shielding gap is very small,the maximum temperature difference is only0. 97 ℃. Under the design condition,the different shaft aperture has little effect on the temperature rise of the canned-motor. With the increase of axial aperture,the maximum temperature of cannedmotor is decreasing. Under the design condition,the relationship between cooling cycle flow and axial aperture is compared with the numerical and theoretical calculations. It is concluded that the results of numerical and theoretical calculations are basically the same,which provides a theoretical basis for the design of cooling cycle loop of canned-motor pump.
To investigate the relationship between cooling cycle loop of canned-motor pumps and the internal temperature rising,the distribution of temperature field and pressure field in the canned-motor and the temperature rise in the cooling circulation loop were simulated and the convective heat transfer information between the coolant and the rotor was analyzed. The thermal-fluid coupling numerical analysis of the whole flow field of the impeller,the chamber and the cooling cycle loop of the canned-motor pump was carried out by using the engineering simulation software CFD based on the real prototype of the stamping-welding canned-motor pump. The results show that under different working conditions,the temperature rise in the shielding gap is very small,the maximum temperature difference is only0. 97 ℃. Under the design condition,the different shaft aperture has little effect on the temperature rise of the canned-motor. With the increase of axial aperture,the maximum temperature of cannedmotor is decreasing. Under the design condition,the relationship between cooling cycle flow and axial aperture is compared with the numerical and theoretical calculations. It is concluded that the results of numerical and theoretical calculations are basically the same,which provides a theoretical basis for the design of cooling cycle loop of canned-motor pump.
引文
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[3]孔繁余,高翠兰,张旭锋,等. PBN65-40-250型屏蔽泵轴向力平衡计算及其试验[J].农业工程学报,2009,25(5):68-72.KONG Fanyu,GAO Cuilan,ZHANG Xufeng,et al. Calculation and test of axial force balance of PBN 65-40-250 shield pump[J]. Transactions of the CSAE,2009,25(5):68-72.(in Chinese)
[4]孔繁余,蒋万明,王文廷,等.低温高速屏蔽泵汽蚀性能的流热耦合分析[J].华中科技大学学报(自然科学版),2012,40(5):24-28.KONG Fanyu,JIANG Wanming,WANG Wenting,et al. Coupled heat and heat coupling analysis of cavitation performance of low temperature and high speed shield pump[J]. Journal of Huazhong University of Science and Technology(natural science edition),2012,40(5):24-28.(in Chinese)
[5]徐文峰,王者文. KQPL型屏蔽泵循环量与孔径的计算[J].通用机械制造,2012(4):90-92.XU Wenfeng,WANG Zhewen. Calculation of circulating quantity and pore size of KQPL shield pump[J].General machinery,2012(4):90-92.(in Chinese)
[6]季建刚,孔繁余,孔祥花.屏蔽泵发展综述[J].水泵技术,2006(1):15-17,20.JI Jiangang,KONG Fanyu,KONG Xianghua. Development of shield pumps[J]. Pump technology,2006(1):15-17,20.(in Chinese)
[7]孔祥花,孔繁余,季建刚,等.屏蔽泵能耗的计算与试验[J].排灌机械,2006,24(4):10-13.KONG Xianghua,KONG Fanyu,JI Jiangang,et al.Calculation and test of energy consumption of shield pump[J]. Drainage and irrigation machinery,2006,24(4):10-13.(in Chinese)
[8]戴锅生.传热学[M].北京:高等教育出版社,2008.
[9]陶文铨.数值传热学[M]. 2版.西安:西安交通大学出版社,2001.
[10]许明宇,温嘉斌,吴桂珍,等.防爆型高功率密度电机温度场与流体场综合计算[J].防爆电机,2008,43(3):30-34.XU Mingyu,WEN Jiabin,WU Guizhen,et al. Comprehensive calculation of temperature field and fluid field of explosion-proof high power density motor[J]. Explosionproof electric machine,2008,43(3):30-34.(in Chinese)
[11]张晓晨,李伟力,曹君慈,等.屏蔽电动机屏蔽损耗与电机性能的计算与分析[J].哈尔滨工业大学学报,2007,39(9):1422-1426.ZHANG Xiaochen,LI Weili,CAO Junci,et al. Calculation and analysis of shielding loss and motor performance of shielded motor[J]. Journal of Harbin Institute of Technology,2007,39(9):1422-1426.(in Chinese)
[12]LIAO Ningbo,YANG Ping. Numerical simulation of heat transfer at the interface of dissimilar materials[J].International journal of numerical methods for heat&fluid flow,2010,20(1):84-95.
[13]TOH K C,CHEN X Y,CHAI J C. Numerical computation of fluid flow and heat transfer in microchannels[J]. International journal of heat and mass transfer,2002,45(26):5133-5141.
[14]蒋万明.对称布置型多级屏蔽泵的研究[D].镇江:江苏大学,2013.