摘要
为探究扩散段立面双向扩张的侧式进/出水口水力特性,采用数值模拟方法,在立面扩张角总和不变时,分析进/出水口拦污栅断面流速分布规律及内部流态特征,讨论扩散段立面双向扩张的优势。结果表明:(1)出流工况,随着顶板扩张角减小、底板扩张角增大,拦污栅断面主流由底部向顶部移动,流速不均匀系数先减小后增大;(2)进流工况,不同扩散段立面双向扩张下的拦污栅断面流速分布规律基本相同;(3)立面扩张角总和不变时,顶板和底板扩张角比值宜在0.5~2.0范围内;(4)扩散段采用立面双向扩张有助于改善拦污栅断面流速分布、降低进/出水口水头损失和减少工程开挖量。研究成果为进/出水口设计提供新思路。
To explore the hydraulic performance of a side inlet/outlet with vertical bidirectional expansion in the diffusion section,numerical simulations were conducted to analyze the velocity distribution at the trash rack section and the internal flow patterns under a constant total vertical expansion angle.The advantages of vertical bidirectional expansion in the diffusion section were also examined.The results show that:①Under outflow conditions,with the decrease of the roof expansion angle and the increase of the floor expansion angle,the mainstream at the trash rack section shifts from the bottom toward the top,and the velocity nonuniformity coefficient decreases first and then increases.②Under inflow conditions,the velocity distribution at the trash rack section remains essentially consistent across different vertical bidirectional expansion conditions.③When the total vertical expansion angle is fixed,the ratio of the roof expansion angle to the floor expansion angle should be in the range of 0.5-2.0.④The vertical bidirectional expansion in the diffusion section effectively improves the velocity distribution at the trash rack section,reduces inlet/outlet head loss and decreases the excavation volume.These findings provide new insights for the design of inlet/outlet structures.
作者
朱洪涛
田端鹏
高学平
ZHU Hongtao;TIAN Duanpeng;GAO Xueping(State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300072,China)
出处
《水科学进展》
北大核心
2026年第1期185-196,共12页
Advances in Water Science
基金
国家自然科学基金项目(52179077)。
关键词
水力特性
侧式进/出水口
立面双向扩张
拦污栅断面流速分布
抽水蓄能电站
数值模拟
hydraulic performance
side inlet/outlet
vertical bidirectional expansion
velocity distribution at the trash rack section
pumped storage power plant
numerical simulation
