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0 。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 01 8 倍叶轮直 径, 此方案的泵系统效率在 340 L/ s 达到 791 08% 。

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.

国家自然科学基金项目( 51279173) ; 江苏省水利科技项目( 2017031) ; 南四湖至东平湖段泵站运行性能测试与技术开发( DDYXB (YW)22018002)