空间导叶面积变化规律对井用潜水泵性能的影响

Research on Variation Law of Space Guide Vane on Performance of Submersible Well Pumps

为了研究空间导叶叶片进出口有效过流面积比和其过水断面面积变化规律对潜水泵性能的影响,保证导叶其他参数不变,设计了9种面积比模型,以效率最优的面积比导叶为基础模型,设计了4种过水断面面积变化规律的导叶,包括线性式、上凸式、下凹式和S形。运用CFD数值模拟方法对其内部流场进行了计算,模拟计算结果与试验结果较为吻合,设计工况下的扬程和效率的误差均在3%以内。通过对潜水泵外特性分析表明:导叶过水断面面积变化规律在设计工况下对泵的效率有显著影响,变化过程中效率的增幅约为4%,但对其扬程影响甚微,最大扬程差仅为0.7 m;各个方案导叶流道的内流场分布结果表明:下凹式面积变化规律能有效改善导叶内流体的流动状态,降低导叶内的能量损失。非线性下凹式面积变化规律优于线性,S形及上凸式面积变化规律,但如何寻找最优变化规律仍需继续探索。

In order to study the influence of the effective flow area ratio between the inlet and outlet of the space guide vane blade and the change law of its cross-section area on the performance of submersible well pump,nine possible configurations have been considered by changing the area ratio while keeping all the other parameters unchanged.Based on the area ratio guide vane model with optimal efficiency,four kinds of guide vanes are designed,including linear,convex up,concave down and S-shaped.The CFD numerical simulation method is used to calculate the internal flow field.And the simulation results are in good agreement with the experiment results,the errors of head and efficiency under design conditions are less than 3%.By analyzing the characteristics of submersible pump,the variation law of guide vane cross-section area has a significant effect on pump efficiency under design condition,efficiency increased by about 4%.But it has a weak influence on the head,the maximum head difference is only 0.7m.The results of the internal flow field distribution in the guide vane passages of different schemes show that the concave down area change law can effectively improve the flow state of fluid in the guide vane and reduce the energy loss.The law of area change of concave down is better than linear,S-shaped and convex up,but how to find the optimal law of area change still needs to be further explored in the future.