立式泵肘形进水流道喉部高度对性能的影响

为保证水流进入弯道时的流态良好,肘形进水流道进口段末端断面的高度通常较小,被称为"喉部"。基于CFD数值模拟进行方案设计和建模计算,对流道喉部断面的高度定量分析,对各方案的内部流态和泵系统性能进行研究。结果表明,喉部高度大的方案进入弯道的流速慢,水力损失小,但流速变化快,分布不均匀;高度小的方案进入弯道流速快,水力损失大,但流速变化慢,流道出口流速均匀性好;文中喉部高度的最优方案为0.8倍叶轮直径,此方案的泵系统效率在340L/s达到79.08%。

Influence of height of throat section of elbow inlet channel on performance of vertical pump system

In or der to ensure a goo d flow patter n when the w ater flows into the curv e, the end cr oss2 sectio n of the inlet of the el2 bow inlet flow channel usua lly has a small heig ht, and is called "t he thro at". Based on CFD numerica l simulatio n, we carried o ut scheme desig n and modeling calculatio n, co nduct ed quantitative analysis on the heig ht of the thr oat sect ion of the f low channel, and studied the inter nal flow stat e and pump system perfo rmance in each scheme. The r esults showed that t he scheme w ith a lar ge thro at height had a slow flow velocit y at the cur ve and small hydraulic lo ss, but the flow v elocity changed rapidly w ith un2 ev en distribution. The small height scheme had a fast flow velo city and larg e hydraulic loss, but t he flow v elocit y changed slow2 ly, with high uniform ity at t he o utlet. T he optima l solution fo r the throat heig ht in the study w as 01 8 times t he impeller diame2 ter. T he pum p system efficiency o f this scheme reached 791 08% at 340 L/s.