复合叶轮对部分流泵流动稳定性的影响  

Influence of composite impeller on flow stability of partial flow pump

作　　者：刘振鹏 LIU Zhenpeng(Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学流体机械工程研究中心,江苏省镇江市212013

出　　处：《农业装备与车辆工程》2023年第6期76-80,共5页Agricultural Equipment & Vehicle Engineering

摘　　要：为探究小流量工况下复合叶轮对部分流泵流动稳定性的影响,基于CFD技术对部分流泵在全流量工况下进行了数值计算。采用能量梯度理论分别对采用传统叶轮和复合叶轮的部分流泵计算结果进行处理,主要对0.1Q_(d)工况下部分流泵的叶轮及蜗壳内的流动进行深入研究。结果表明:在小流量工况下,相比传统叶轮,采用复合叶轮的部分流泵对叶轮流道内的轴向漩涡控制效果更好,环形蜗壳内二次流现象得以改善,叶轮的能量梯度函数分布更均匀,且在喉部喷嘴及叶轮出口处的分布面积更小。In order to explore the influence of the composite impeller on the flow stability of the partial flow pump under the condition of small flow,the numerical calculation of the partial flow pump under the condition of full flow was carried out based on the CFD technology.Then the energy gradient theory is used to process the calculation results of the partial flow pump using the traditional impeller and the composite impeller respectively.The flow in the impeller and volute of the partial flow pump under the 0.1Q_(d) working condition is mainly discussed in depth.The result shows that,under the condition of small flow rate,the partial flow pump using the composite impeller has better control effect on the axial vortex in the impeller channel than using the traditional impeller;Compared with the traditional impeller,the partial flow pump with compound impeller improves the secondary flow phenomenon in the annular volute;Compared with the traditional impeller,the energy gradient function distribution of the composite impeller is more uniform,and the distribution area at the throat nozzle and the impeller outlet is smaller.

关 键 词：部分流泵 流动稳定性 能量梯度 小流量工况 叶轮 

分 类 号：TH31[机械工程—机械制造及自动化]