Numerical simulation of flow in centrifugal pump with complex impeller
Numerical simulation of flow in centrifugal pump with complex impeller
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DOI：
10.1007/s11630-011-0433-1
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发表时间：
2011-02
影响因子：
2.5
通讯作者：
B. Cui;Yong-gang Lin;Ying-zi Jin
中科院分区：
文献类型：
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作者：
B. Cui;Yong-gang Lin;Ying-zi Jin
基于Navier-Stokes方程和Spalart-Allmaras湍流模型，对长、中、短叶片复合叶轮离心泵内三维湍流流场进行了数值计算和分析。得到了过流部分的相对速度和压力分布。研究发现，由于蜗壳与叶轮的共同作用，复合叶轮流道内的流动是不对称的。回流区位于长叶片吸力面进口、长叶片压力面中部附近和短叶片吸力面出口。蜗壳对喉部附近的流动影响较大。蜗壳喉部附近的复合叶轮出口处相对速度大，容易产生回流。在叶轮中，静压和总压从入口到出口均匀地上升。在叶轮出口处，压力从压力侧到吸力侧呈周期性下降，然后在喉部附近静压急剧上升。实验结果表明，叶轮内的回流对泵的性能有重要影响。
Based on the Navier-Stokes equations and the Spalart-Allmaras turbulence model, three dimensional turbulent flow fields in centrifugal pump with long-mid-short blade complex impeller are calculated and analyzed numerically. The relative velocity and pressure distributions in the flowpart are obtained. It is found that the flow in the passage of the complex impeller is unsymmetrical due to the joint action between volute and impeller. The back-flow region is at inlet of long-blade suction side, near middle part of long-blade pressure side and outlet of short-blade suction side. The flow near volute throat is affected greatly by volute. The relative velocity is large and it is easy to bring back flow at outlet of the complex impeller near volute throat. The static and total pressure rise uniformly from inlet to outlet in the impeller. At impeller outlet, the pressure periodically decreases from pressure side to suction side, and then the static pressure sharply rise near the throat. The experimental results show that the back flow in the impeller has an important influence on the performance of pump.