摘要
为改善从多沙河流取水的大型泵站进水前池内不良水流流态,以甘肃省景泰川电力提灌工程典型泵站的某侧向进水前池为研究对象,构建不同边墙收缩角体型结构的侧向进水前池三维模型,采用FLUENT软件基于Realizable k-ε模型和Mixture多相流模型开展数值模拟计算,获得了侧向进水前池流场结构和水流流速随边墙收缩角的变化规律.结果表明:水流由渠道进入前池后,受机组吸水的影响,水流迅速转向,在侧向进水前池形成划分明显的流场结构区域,进水前池中央形成高流速主流区,主流区两侧产生大小不一的旋涡,并形成低流速回流区.随着侧向进水前池边墙收缩角的增大,水流直线运动距离增大,偏转角度减小,入池水流沿流程发展和扩散效果增强,主流区面积明显增加,回流区面积和旋涡尺度显著削减,边墙收缩角α=5°时的综合均匀度较工程原型泵站提高了5.58%,有效改善了多泥沙河流引水泵站前池的泥沙淤积问题,研究成果可为同类泵站的设计和更新改造提供指导和参考.
To improve the adverse flow pattern in the forebay of a large pumping station drawing water from a sandy river,a typical pump station of the Jingtai River Diversion Power and Irrigation Project in Gansu Province was selected as research object.A three-dimensional model of the forebay with varying side wall contraction angles was constructed,and numerical simulations were conducted using Fluent software,based on the realizable k-ε model and the mixture multiphase flow model.The simulations yielded the flow field structure and changes in water flow velocity with variations in the side wall contraction angle.The results show that after water enters the forebay from the channel,it rapidly turns due to the suction from the pump units,forming a divided flow field structure in the lateral forebay.A high-velocity mainstream area forms in the center of the forebay,with vortices of varying sizes on either side creating low-velocity recirculation areas.As the side wall contraction angle increases,the linear motion distance of the water increases,the deflection angle decreases,and the flow development and diffusion effects along the flow path are enhanced.The area of the mainstream zone significantly increases,while the recirculation zone area and vortex size are markedly reduced.At a side wall contraction angle of α=5°,the overall uniformity is improved by 5.58%compared to the original project pump station,effectively mitigating sediment accumulation problems in the forebay of a pump station drawing water from a sediment-laden river.These research findings can provide guidance and reference for the design and retrofitting of similar pump stations.
作者
樊新建
姚薇
董春海
李龙基
贾广钰
孙江河
FAN Xinjian;YAO Wei;DONG Chunhai;LI Longji;JIA Guangyu;SUN Jianghe(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730000,China;Jingtaichuan Electric Power Lift Irrigation Administration Bureau of Gansu Province,Jingtai,Gansu 730400,China;Gansu Water Resources and Hydropower Survey and Design Institute Limited Company,Lanzhou,Gansu 730000,China)
出处
《排灌机械工程学报》
北大核心
2025年第8期803-811,共9页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(513798128)
甘肃省自然科学基金资助项目(21JR7RA238)
甘肃省水利科学试验研究及技术推广项目(甘水建管发〔2020〕46号第70,23GSLK038)。
关键词
泵站
侧向进水前池
边墙收缩角
流场结构
泥沙淤积
pumping station
lateral inflow forebay
side wall contraction angle
flow field structure
sediment deposition
