带分流短叶片离心泵内流场分析

Research on Inner Flow Field of Centrifugal Pump with Splitter Blades

设置3种不同叶片数的低比转速离心泵叶轮,选取性能较优的模型为原型泵,设计添加不同长短分流叶片的研究方案。对各方案中带分流叶片离心泵进行全流场三维非定常模拟计算,分析压力及速度分布,揭示内部流动规律。通过对蜗壳内监测点数据分析得出流场压力脉动时域和频域特性。结果表明:添加分流叶片后,低比转速离心泵压力和速度分布更趋均匀,蜗壳出口及隔舌位置压力脉动幅值明显减小,泵内流体损失减少,扬程和效率平均提高22.3%和8.1%;当分流短叶片进口直径取0.65 D2、进口偏置角取5°和出口偏置角取0°时泵的性能最优。

Three different long blades of low-specific-speed centrifugal pump were chosen by performance characteristics contradistinction,and the different splitter blades were based on the prototype pump. The inner flow law was discovered due to the pressure and velocity distribution of flow field unsteady simulation of centrifugal pump with splitter blades. By the analysis of monitoring points of inner volute,the pressure pulsation time domain and frequency domain characteristics were acquired. The results showed that pressure and velocity distribution are improved,and the pressure pulsation amplitude in volute outlet and cut-water were obviously reduced. As the pump flow loss reduced,head and efficiency were also improved by 22. 3% and 8. 1%. The pump performance was best when the splitter blades inlet diameter is 0. 65 D2,inlet bias angle was 5°,and outlet bias angle was 0°.