立式轴流泵装置叶轮与导叶间非定常流场分析

Unsteady Flow Field Analysis of Impeller and Guide Vane in Vertical Axial Flow Pump

为了分析立式轴流泵装置叶轮和导叶体的非定常流场特征,采用ANSYS CFX对立式轴流泵装置全流道进行三维非定常数值计算,预测泵装置的能量性能,并通过物理模型试验进行验证。结果表明,各流量工况时,叶轮进口圆周测线的轴向速度分布均呈类正弦分布,波峰、波谷数与叶轮的叶片数相一致。小流量工况时,叶轮进口面的速度分布受叶轮的影响明显,速度加权偏流角与导叶体出口的平均涡角均最大。随着流量的增大,肘形进水流道的能量损失逐渐增大;导叶体的能量损失随着流量的增大呈先减小后增大的趋势,在最优工况时导叶体的能量损失最小,在小流量工况时60°弯管和虹吸式出水流道的能量损失之和最大。研究结果有利于立式轴流泵装置的结构优化与能效提高。

In order to analyze the unsteady flow field of the impeller and guide vane of the vertical axial flow pump device,the three-dimensional unsteady numerical calculation of the whole flow channel of the vertical axial flow pump device is carried out by ANSYS CFX,and the energy performance of the pump device are predicted,and verified by physical model test.The results show that the axial velocity distribution of the circumferential measurement line at the inlet of the impeller is sinusoidal,and the number of peaks and valleys is consistent with the number of impeller blades.Under the condition of small flow rate,the velocity distribution on the impeller inlet surface is significantly affected by the impeller,with the maximum weighted velocity deviation angle and the maximum average vortex angle at the outlet of the guide vane.With the increase of flow rate,the energy loss of elbow inlet increases gradually.The energy loss of the guide vane first decreases and then increases with the increase of flow rate.The energy loss of the guide vane is the smallest under the optimal condition,and the sum of the energy loss of the 60°elbow and siphon outlet is the largest under the small flow condition.The research results are beneficial to structure optimization and energy efficiency improvement of vertical axial flow pump.