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以立式离心泵渐缩式直锥形吸水室为研究对象,采用数值模拟方法,应用FLUENT软件,基于N-S方程,采用重整化k-ε模型、SIMPLE算法和MRF模型对设计工况下的9组离心泵模型进行了仿真分析,预测了泵的性能,研究了渐缩式直锥形吸水室内部的流动状况及其锥角对泵性能的影响.结果表明,靠近吸水室内壁面区域和靠近叶轮进口区域流场较紊乱且随吸水室锥角变大逐步加剧;吸水室中心线附近区域沿水流方向流速变化率不大,靠近内壁面区域沿水流方向流速变化率较大且随吸水室锥角变大流速变化率逐渐增加;泵的轴功率随着吸水室锥角的增大而变大,扬程和效率随着吸水室锥角的变大略有下降.通过仿真可以为直锥形吸水室的设计提供一定的理论参考.
In this paper, the centrifugal tapered suction chamber with vertical centrifugal pump is taken as the research object. The numerical simulation method is adopted. The FLUENT software, the NS equation, the regularized k-ε model, the SIMPLE algorithm and the MRF model 9 centrifugal pump model were simulated and the performance of the pump was predicted.The flow conditions inside the tapered straight conical suction chamber and the influence of its taper angle on the performance of the pump were studied.The results show that close to the inner wall surface of the suction chamber and near The flow field in the impeller inlet area is more turbulent and gradually aggravates with the taper angle of the suction chamber; the rate of change of flow velocity in the area near the center line of the suction chamber along the flow direction is not large, and the rate of change of flow velocity along the flow direction near the inner wall surface is large, The rate of change of the angle becomes larger and the rate of change of the flow rate gradually increases.The pump shaft power increases with the increase of the taper angle of the suction chamber and the lift and efficiency decreases slightly with the increase of the taper angle of the suction chamber.Through the simulation, The design provides some theoretical reference.