水科学进展2017，Vol.28Issue(1)：67-75,9.DOI:10.14042/j.cnki.32.1309.2017.01.008
出渗对均匀大粒径泥沙附近水动力特性影响
Effect of upward seepage on hydrodynamic characteristics around uniform coarse grains
摘要
Abstract
In order to study the influence of upward seepage on the flow characteristics around uniform coarse grains,we experimentally measured the flow structures around uniform coarse grains under the impact of upward seepage by the technique of Particle Image Velocimetry (PIV),we subsequently analyzed the two-dimensional vertical flow struc ture around the particle group with different relative upward seepage intensities.The results show that upward seepage decreases the velocity along the mainstream direction and increases the vertical upward velocity around the particle group.With the relative upward seepage intensity increases,both of them become more affected.We also proposed an empirical formula for the longitudinal current velocity distribution under the impact of upward seepage based on the measurements.We finally found that the upward seepage could enhance the turbulence intensity and energy dissipation around the particle group,and the value of vorticity around uniform coarse grains decreases with the increase of rela tive upward seepage intensity.关键词
水动力特性/出渗/颗粒群/粒子图像测速技术Key words
hydrodynamic characteristics/coarse grains/flow structure/particle image velocimetry分类
建筑与水利引用本文复制引用
蒋昌波,刘洋,邓斌,刘易庄,陈家源..出渗对均匀大粒径泥沙附近水动力特性影响[J].水科学进展,2017,28(1):67-75,9.基金项目
国家自然科学基金资助项目(51179015 （）
51239001) （）
The study is financially supported by the National Natural Science Foundation of China (No.51179015 （）
No.51239001). （）
