进水流道对立式混流泵装置能量特性的影响

Influence of suction box on energy characteristics of vertical mixed-flow pumping systems

采用计算流体力学方法,对三个不同的进水流道设计方案所组成的立式混流泵装置进行了内流数值模拟.在分析进水流道基本流态的基础上,对进水流道出口水流条件以及水泵装置能量特性进行了定量计算.数值计算结果表明,水泵的设计进水条件与水泵装置中的水泵进水条件存在明显差异,进水流道水力设计对立式混流泵装置的能量特性有显著的影响,工程设计中应重视进水流道的选型以及进水流道与水泵性能最佳匹配的研究.进水流道水力设计优化可有效地改善进水流道出口流态,确保水泵有良好的进水条件,大幅度提高水泵装置效率.

The computational fluid dynamics was adopted to simulate the internal flow of mixed-flow pumping systems with three suction box design schemes. Based on the analysis of the basic flow patterns, the outlet flow conditions of the three suction boxes and energy characteristics of the corresponding pumping system were quantitatively calculated. The simulated results indicate that the designed flow conditions for pumps are obviously different from those supplied for the pumps in real pumping systems, and the hydraulic design of suction boxes has notable influence on the energy characteristics of mixed-flow pumping systems. Therefore, attentions should be paid to the selection of suction box type, and researches be conducted on the optimal match of suction boxes with pump performances, The optimal hydraulic design of suction box can effectively improve the outlet flow pattern of suction box to ensure better flow conditions for pumps, and raise the pumping system efficiency substantially.