摘要
为探讨坝头形式对丁坝附近水流结构的影响,建立三种坝头形式的正挑丁坝,采用三维数学模型进行模拟,分别从自由液面、流速分布、回流场尺寸、漩涡及紊动能5个方面分析.研究表明:方形直头丁坝附近自由液面变化趋势与其他两种形式丁坝略有不同;坝头形式对丁坝近底床流速影响显著;圆弧直头丁坝的影响程度与扇形直头丁坝相差不大,其有效影响范围较方形直头丁坝小;各丁坝坝后均形成横轴漩涡,扇形直头丁坝与其他两种丁坝不同,形成两个不同方向的横轴漩涡;方形直头丁坝、圆弧直头丁坝、扇形直头丁坝的紊动能最大值依次减小,并且紊动区域呈现出向上游移动的趋势.
In order to study the influence of head types of spur dike on near flow characteristics,three head types of spur dikes are established.Three-dimensional mathematical model is established to simulate and analyze the free surface elevation,flow velocity distribution,size of backflow region,whirlpool and turbulent kinetic energy respectively.The study shows that the variation trend of free surface elevation near square straight spur dikes is slightly different from that of the other two types of spur dikes.Head types have a significant influence on the flow velocity near the bottom bed.The arc straight spur dike has little different from that of fan-shaped straight spur dike,and the effective range of influence is smaller than that of square straight spur dike.Transverse whirlpool is formed behind each spur dike.The transverse whirlpool of fan-shaped straight spur dike has two different directions which is different from the other two spur dikes.The maximum turbulent kinetic energy of square straight spur dike,arc straight spur dike and fan-shaped straight spur dike decrease successively.The turbulent region shows a tendency of moving upstream.
作者
方强
黄赛花
王继保
陈艳超
Fang Qiang;Huang Saihua;Wang Jibao;Chen Yanchao(College of Hydraulic&Environment Engineering,China Three Gorges Univ.,Yichang 443002,China;College of Hydraulic&Environment Engineering,Zhejiang Univ.of Water Resources&Electric Power,Hangzhou 310018,China)
出处
《三峡大学学报（自然科学版）》
CAS
北大核心
2019年第6期7-11,共5页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金面上项目(51478417)
关键词
坝头形式
自由液面
流速
回流场
漩涡
紊动能
head type
free surface elevation
flow velocity
backflow region
whirlpool
turbulence kinetic energy
作者简介
通信作者:王继保(1976-),男,副教授,博士,硕士生导师,主要从事水力学及河流动力学方面的教学和研究.E-mail:wjbtina@ctgu.edu.cn。
