不同叶片包角对螺旋形单蜗壳离心泵叶轮径向力特性的影响

Effect of Different Blade Wrap Angle on Impeller Radial Force for a Helical Single Spiral Volute Centrifugal Pump

为研究叶片包角对螺旋形单蜗壳单级单吸离心泵叶轮径向力特性的影响,应用CFD软件对某模型泵内部流场进行了数值计算,在保证蜗壳和其他叶轮几何参数不变的前提下,设计了3种叶片包角分别为110°、120°、130°的叶轮,模拟得到不同工况下叶轮所受径向力分布特性,并用外特性试验验证了数值模拟的可靠性。结果表明:设计工况下,作用在叶轮上的径向力最小,0.4 Q下的径向力最大,且脉动幅值最大;叶片包角对叶轮所受径向力影响较大,以在额定工况下运行为例,叶片包角取130°时,径向力脉动最为紊乱,叶片包角取110°时,径向力脉动幅值较大;整体来看,叶片包角120°的方案性能最优。该研究可为低振动离心泵的水力优化设计、增强泵的运行稳定性提供参考。

In order to investigate the effects of impeller wrap angle on the impeller radical force of the single-stage and single-suction centrifugal pump with single spiral volute,the software CFD is applied to conduct the numerical calculation on the inner flow field of a model pump. Three kinds of impellers with different wrap angle are designed on the premise that the other geometric parameters of impellers and volutes are the same,and the wrap angle is designed as 110°,120° and 130°. Then,the distribution characteristics of radical force on the impeller under different conditions can be acquired through simulation. Besides,The reliability of numerical simulation is verified by the experiment of external characteristics. The results show that the radical force on the impeller is minimum under the designed condition and maximum under 0. 4 Q. Furthermore,the pulsating amplitude is also the biggest under 0. 4 Q. Therefore,the impeller wrap angle has a significant effect on the radical force. Taking the case under the designed condition for example,when the wrap angle is 130°,the fluctuation of radical force is maximum. When the wrap angle is 110°,the fluctuation of radical force is also big. On the whole,when the wrap angle is 120°,the performance of the scheme is optimal. This research can give reference for the hydraulic optimized design of centrifugal pump with low vibration and the improvement on operation stability of pumps.