地下泵站进水流道数值模拟与方案优化
Numerical simulation and design optimization on flow passage of underground pump station
李甲振 1王涛 1薛兴祖 2郭永鑫 1付辉 1纪昌知3
作者信息
- 1. 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京 100038
- 2. 吉林省水利水电勘测设计研究院,吉林长春 130021
- 3. 中国三峡建工(集团)有限公司,四川成都 610023
- 折叠
摘要
以典型地下泵站的进水流道为研究对象,建立数值仿真模型,分析设计方案的水力特性及存在不足,并给出优化方案.研究结果表明:在原方案中,外侧水泵进水管入口中心和圆洞出口中心的连线与来流方向的夹角达到7 0 °,水流大角度偏转,并在进水管入口出现脱流现象,水头损失系数达到2.31～2.44,水泵进水管出口的流速分布均匀度为95.09％～96.80％,速度加权平均角为86.51°～87.41°,原方案的圆洞突扩进入压力罐,然后突缩进入水泵的进水管,且压力罐内无任何导流措施,致使局部流道产生了较大的水头损失;优化方案提出了"集管+岔管"的分流措施,通过2个60°弯头实现水流流向的偏移,平面和垂直方向均没有突扩或突缩结构,水头损失系数减小至0.93～1.07,优化方案不仅改善了流道的水力性能,也避免了开挖、衬砌压力罐.研究结果可为类似地下泵站进水流道设计提供一定依据.
Abstract
Taking the flow passage of an underground pump station as a case study,the numerical si-mulation model were established.The hydraulic performance and defects of designed layout was ana-lyzed,moreover,the optimal layout was presented.The results show that the flow separation occurres at the entrance of inlet pipe in the designed layout,which resultes from the large intersection angle of 70° between the inflow direction and the connection line from the center of inlet pipe entrance to that of the circular tunnel outlet.The head loss coefficient reaches 2.31-2.44,while the flow velocity distribu-tion uniformity and velocity weighted average angle are 95.09％-96.80％and 86.51°-87.41°,respec-tively.The pressure tank connectes the foregoing circular tank using sudden expansion cross-section and the following inlet pipe using abrupt contraction,without any guidance structure,which lead to large head loss coefficient.The optimal layout adoptes manifold tube and branch pipes to distribute wa-ter flow and two 60° elbows to offset the flow.There is no sudden expansion or contraction structure,and the head loss coefficient is largely reduced to 0.93-1.07.The hydraulic performance is improved,and the excavation and lining of pressure tank are avoided.The research results can serve as guidance for other similar projects.
关键词
地下泵站/进水流道/水力性能/评价指标/数值模拟Key words
underground pump station/flow passage/hydraulic performance/evaluation index/numerical simulation引用本文复制引用
基金项目
国家自然科学基金资助项目(52179082)
国家自然科学基金资助项目(51609265)
国家重点研发计划项目(2016YFC0401808)
出版年
2024
国家科技期刊平台
NSTL
万方数据