屏蔽泵冷却循环回路的热流耦合

Thermal-fluid coupling of cooling cycle loop in canned-motor pump

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.