摘要
基于CFX软件,运用N-S方程和RNG k-ε湍流模型,对某泵站正向进水前池流态进行数值模拟,分析无整流措施下前池的流动特性,研究增设“V”形导流墩的位置、长度、分叉角度等因素对前池流态和机组进口轴向速度分布均匀度的影响。计算结果表明:无整流措施时,泵站前池面层流态较好,底层两侧存在大区域回流;“V”形导流墩具有良好的分流扩散作用,但单个“V”形导流墩方案难以使每台机组进口的轴向速度分布均匀度均得到提升,设置两个相同的“V”形导流墩常导致1号机组前的水流发生偏斜,导致其进水流态差,设置两个不同的“V”形导流墩更有利于前池不良流态的消除。当导流墩A、导流墩B分别距进水池进口15D、20D,距2号机组中心线7.5D、5D,长度均为3D,分叉角度分别为15°、30°时,对前池两侧的回流区具有较好的改善作用,使1、2、3号机组进口的轴向速度分布均匀度分别提高17.8%、2.7%、9.8%。
Based on CFX software,N-S equation and RNG k-ε turbulence model were used to simulate theflow pattern of the forebay of a pumping station. To analyze the flow pattern of the forebay without rectification,and study the influence of the position,length and bifurcation angle of the V-shaped diversion pier on the flow pattern of the forebay and the uniformity of axial velocity distribution at the inlet of the unit. The results show that the laminar flow pattern of the forebay surface of the pumping station is better without rectifying measures,and there is a large area of the backflow on both sides of the bottom. V-shaped diversion pier have good diversion and diffusion effect on the incoming flow,but a single V-shaped diversion pier scheme is difficult to improve the uniformity of axial velocity distribution of each unit. The setting of two identical V-shaped diversion piers often leads to the deviation of the water flow in front of the No.1 unit,resulting in the poor inflow state. Setting two different V-shaped diversion piers is more beneficial to the elimination of the bad flow pattern in forebay. When pier A and pier B are respectively 15 D and 20 D away from the inlet of the inlet pool,7.5 D and 5 D away from the centerline of Unit No.2,the lengths are both 3 D,and the bifurcation angles are respectively 15° and 30°,the backflow area on both sides of the front pool has A better improving effect. The uniformity of axial velocity distribution at the inlet of No.1,No.2 and No.3 units increases by 17.8%,2.7% and 9.8%,respectively.
作者
刘志泉
成立
卜舸
袁连冲
施伟
LIU Zhi-quan;CHENG Li;BU Ge;YUAN Lian-chong;SHI Wei(College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,Jiangsu Province,China;Jiangsu Surveying and Design Institute of Water Resources Co.,Ltd.,Yangzhou 225127,Jiangsu Province,China;The Eastern Route of South-to-North Water Diversion Project Jiangsu Water Source Co.,Ltd.,Nanjing 210029,Jiangsu Province,China)
出处
《中国农村水利水电》
北大核心
2022年第3期183-188,共6页
China Rural Water and Hydropower
基金
国家自然科学基金(51779214)
江苏水利科技项目(2019014)
江苏水利科技项目(2020027)。
关键词
泵站
前池
“V”形导流墩
数值模拟
pumping station
forebay
V-shaped diversion pier
numerical simulation
