1.Offshore Oil Engineering Co Ltd;2.Research Center of Fluid Machinery Engineering and Technology,Jiangsu University
高效大流量排水泵是突水抢险排水的重要设备,为进一步理解排水泵的内部流动特性,以离心式排水泵水力模型为研究对象,采用ANSYS CFX数值模拟方法,基于三维不可压缩流体的N-S方程和RNG k-ε湍流模型,对不同工况下的离心式排水泵水力模型的内部流场进行了数值模拟。通过数值计算获得的水力性能数据与试验数据进行对比,验证了数值计算方法的可靠性。计算结果表明：当流量较小时,泵内部存在流动旋涡,随着流量的增大,流动漩涡现象得到一定程度改善；叶轮径向力随流量增加而减小,轴向力随着流量增加而递增,且叶轮径向力具有较大幅值的周期性变化,而叶轮轴向力周期波动的幅值较小；泵内各监测点的压力脉动主频为一倍叶频,且高幅压力脉动均集中在低频区,主频脉动幅值随流量的增大而减小。研究结果探明了排水泵的内部流动特性,可为类似泵优化设计提供有益参考,进而提高其运行效率。
High efficiency large flow drainage pump is an important equipment for water inrush rescue drainage. In order to further understand the internal flow characteristics of the drainage pump, the hydraulic model of centrifugal drainage pump is taken as the research object, the ANSYS CFX numerical simulation method is adopted, based on the N-S equation of three-dimensional incompressible fluid and RNG k- ε Turbulence model is used to simulate the internal flow field of the hydraulic model of centrifugal drainage pump under different working conditions. The results show that when the flow rate is small, there is a flow vortex in the pump. With the increase of the flow rate, the flow vortex phenomenon is improved to a certain extent; The radial force of impeller decreases with the increase of flow rate, and the axial force increases with the increase of flow rate; The main frequency of the pressure pulsation at each monitoring point in the pump is one time of the blade frequency, and the high amplitude pressure pulsation is concentrated in the low frequency area, and the amplitude of the main frequency pulsation decreases with the increase of the flow rate. The research results prove the internal flow characteristics of the drainage pump, which can provide a useful reference for the optimization design of similar pumps, and thus improve their operating efficiency.