基于全模拟的水泵装置模型虹吸出水流道水力特性分析

Simulation analysis of the pump device model hydraulic performance of siphon discharge conduit

虹吸式出水流道是大型泵站出水流道的主要形式之一,由于实际工程地形条件的限制,南水北调东线水源工程江都一站所采用的虹吸出水流道在工程设计中并不常见。针对江都一站泵装置模型虹吸出水流道,通过CFX软件对该泵装置全流道进行数值模拟,研究虹吸出水流道内部水流的运动特性、预测水力性能。计算结果表明管路水头损失主要来自于弯管段的水头损失,从出水流道进口至出水流道出口涡量呈现下降趋势,但是在出水流道出口,由于截面面积过大导致出口截面速度分布不均且引起了涡量的增加。对该泵装置进行外特性预测得到的结果与试验数据的整体趋势基本一致,表明计算结果真实可信。

Siphon outlet conduit is one of the main forms of outlet conduit of large pumping station.Due to the limitation of actual engineering topographic features,the siphon outlet conduit adopted by the South-to-North Water Diversion Project--Jiangdu NO.1pumping station is not common in engineering design.According to the siphon discharge conduit in Jiangdu NO.1pumping station,numerical simulation of the whole flow passage was conducted by CFX,the internal water flow movement characteristics of the siphon outlet conduit were studied and the hydraulic performance was predicted.The results showed that the lower head loss mainly came from the head loss of bending section.In outlet passage,vorticity showed a downward trend,but the cross section area was too large to cause the uneven distribution of the velocity of the outlet section and increase of the vorticity.External characteristics of the pump device prediction results were consistent with the test data of the overall trend,demonstrating that the calculation results were reliable.