长短叶片叶轮双吸离心泵径向力数值仿真

Numerical Simulation of Radial Force in Double-Suction Centrifugal Pump Impeller with Long and Short Vanes

将1200S56型单级双吸离心泵原型叶轮改型为长短叶片复合叶轮,以该改型双吸长短叶片复合叶轮离心泵为研究对象,基于CFD理论对该离心泵内部流场进行数值仿真。通过改变边界条件获得不同工况下叶轮出口与蜗壳耦合面的静压、速度分布。采用叶轮出口压力法分析该离心泵在不同工况下的径向力,并与原型叶轮离心泵径向力分析结果对比。结果表明:采用长短叶片复合叶轮使叶轮出口的静压力及绝对速度变大,增加了离心泵的扬程,有效的提高了泵的整体水力性能;短叶片的增加使该泵径向力的最小值点向大流量偏移,出现在1.2倍额定流量工况,最小值由原型叶轮的5574N减小到1494N;采用长短叶片复合叶轮改善了泵在大流量工况下的径向受力情况。

The 1200S56 double-suction centrifugal pump impeller was modified as the impeller with long and short vanes, taking the double-suction centrifugal pump impeller with long and short vanes as research object, the three-dimensional flow field of the centrifugal pump was simulated based on the CFD theory. By changing the boundary conditions, the static pressure and velocity distribution of the impeller-volute coupling surface on different conditions was obtained. The radial force Of centrifugal pump under the different conditions was analyzed based on the outlet pressure method. Comparing the impeller with long and short vanes of analysis results with prototype impeller of analysis results, the results show that the static pressure and absolute velocity of the impeller-volute coupling surface are increased, the head of the centrifugal pump is increased also, and the overall hydraulic characteristics of the centrifugal pump is effectively improved by using the impeller with long and short vanes. The minimum value of the radial force is shifted to the large flow, and appeared under 1.2 times of design flow condition. The minimum value is redueed from the 5574N of the prototype impeller to the 1494N of the impeller with long and short vanes. The radial force state of the prototype centrifugal pump with large flow conditions is improved by using the impeller with long and short vanes.