摘要
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%。
In order to ensure a good flow pattern when the water flows into the curve,the end cross-section of the inlet of the elbow inlet flow channel usually has a small height,and is called 'the throat'.Based on CFD numerical simulation,we carried out scheme design and modeling calculation,conducted quantitative analysis on the height of the throat section of the flow channel,and studied the internal flow state and pump system performance in each scheme.The results showed that the scheme with a large throat height had a slow flow velocity at the curve and small hydraulic loss,but the flow velocity changed rapidly with uneven distribution.The small height scheme had a fast flow velocity and large hydraulic loss,but the flow velocity changed slowly,with high uniformity at the outlet.The optimal solution for the throat height in the study was 0.8times the impeller diameter.The pump system efficiency of this scheme reached 79.08% at 340L/s.
作者
严天序
刘超
查智力
黄佳卫
YAN Tianxu;LIU Chao;ZHA Zhili;HUANG Jiawei(College of Hydraulic&Power Engineering,Yangzhou University,Yangzhou 225009,China)
出处
《南水北调与水利科技》
CAS
北大核心
2019年第1期186-192,共7页
South-to-North Water Transfers and Water Science & Technology
基金
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)-2018002)~~
关键词
肘形进水流道
喉部高度
数值模拟
内部流态
泵系统
elbow inlet flow channel
height of throat section
numerical simulation
internal flow state
pump system
