双叶片离心泵内固液两相流径向力特性研究

A Study of Radial Force Characteristics of Solid-liquid Two-phase Flow Double-blade Centrifugal Pump

径向力特性是泵运行稳定性的一个重要指标。为了研究固体颗粒物性对固液两相流泵径向力的影响,采用Mixture多相流模型对双叶片泵内部流动进行三维非定常模拟计算,并分析了不同工况和颗粒物性下泵径向力特性的变化规律。研究结果表明:固液两相流工况时的叶轮径向力峰值及其峰峰值均比对应流量的清水工况时要大,最大增幅分别达到7.8%和8.2%;两相流条件下,一个叶轮旋转周期内前后半个周期的叶轮径向力分布重合部分均较少;随颗粒密度、体积分数和粒径的增大,叶轮径向力大小和方向波动的越来越剧烈,叶轮径向力矢量中心有从坐标系第二象限向第四象限移动的趋势。

Radial force characteristics are an important indicator of pump stability. In order to study the influence of solid particle physical properties on the radial force of solid-liquid two-phase flow pump,the mixture multiphase flow model is used to perform three-dimensional unsteady simulation calculations on the internal flow of a two-blade pump,and the variation law of pump radial force characteristics under different working conditions and particle properties is analyzed. The results show that the peak value of the impeller radial force and its peak-to-peak value in the solid-liquid two-phase flow condition under each flow rate is more than those in the corresponding flow rate,and the radial force peak and its peak-to-peak maximum increase by 7.8% and 8.2%. Under the condition of two-phase flow,the overlap of the radial force distribution of the impeller in the first half cycle of one impeller rotation period is less. With the increase in particle density,volume fraction and particle size,the impeller radial force magnitude and direction fluctuations are more intense. The impeller radial force vector center has a tendency to move from the second quadrant to the fourth quadrant in the coordinate system.