摘要
为探讨方形桥墩周围紊动特性和墩后尾涡区尺寸变化规律,基于粒子图像测速(PIV)技术对方形桥墩附近水流结构进行了测量,并对不同雷诺数(7500≤Re≤20000)下方形桥墩附近紊动特性和墩后尾涡区尺寸进行了分析。结果表明:墩侧紊动强度沿横向先增大至极大值,而后迅速减小至零附近,且随着雷诺数的增大,墩侧水流紊动的影响范围逐渐扩大;根据实测数据,拟合出桥墩相对紊流宽度和墩后尾涡区相对时均体积与弗劳德数的关系式,两者与弗劳德数分别存在较好的幂函数和二次函数关系,同时拟合得到了墩后尾涡区相对时均面积与相对水深和弗劳德数的关系式,且相关性良好。
In order to study the rule of turbulence characteristics and tail vortex zone scale around a square pier,the flow structure surrounding a square pier was measured by the technique of particle image velocimetry(PIV).The turbulence characteristics at the middle water-depth horizontal planes near the square pier and the tail vortex zone scale of the square pier were analyzed in detail under different Reynolds numbers(7500≤Re≤20000).The results show that turbulence intensity at the pier side increases to the maximum value and then decreases to near zero rapidly along the transverse direction.With the Re increases,flow turbulence at the pier side become more affected.According to the experiments,the relations between the relative turbulent flow width and the time averaged relative volume of the tail vortex zone with varied Fr have been fitted,which show a good correlation with a power relation and a quadratic relation respectively.An empirical formula for the time-averaged relative area of the tail vortex zone with different water-depth planes under the impact of Fr was also proposed with good correlation.
作者
刘洋
徐毅
王茂枚
赵钢
王远
LIU Yang;XU Yi;WANG Maomei;ZHAO Gang;WANG Yuan(Hydraulic Research Institute of Jiangsu Province,Nanjing 210017,China;Jiangyin Water Conservancy Engineering Company,Jiangyin 214400,China)
出处
《水利水电科技进展》
CSCD
北大核心
2022年第4期55-60,共6页
Advances in Science and Technology of Water Resources
基金
江苏省科技厅创新能力建设计划省属公益类科研院所自主科研经费项目(BM2018028)
江苏省水利科技项目(2019001,2020007)。
关键词
方形桥墩
紊动特性
尾涡区
粒子图像测速技术
square pier
turbulence characteristics
tail vortex zone
particle image velocimetry technology
