%0 Journal Article
%A FANG Shi-long
%A CHEN Hong
%A SHI Xiao-fei
%T Flow Patterns and Turbulence Characteristics Around a Submerged Vertical Circular Cylinder
%D 2016
%R 10.11988/ckyyb.20150991
%J Journal of Yangtze River Scientific Research Institute
%P 55-60
%V 33
%N 12
%X Although submerged vertical circular cylinders have been widely applied in  engineering fields, there are no  systematic study on the flow pattern and turbulence characteristics in the flow field around the submerged vertical circular cylinders.In view of this,we carried  out indoor flume experiment with  different slopes and accurately measured the   instantaneous velocity field around the submerged vertical circular cylinders. According to the test result, we analyzed  the impact of the submergence ratio on the vertical distribution of three-dimensional  flow velocity and turbulence intensity along upstream and downstream vertical symmetry plane of the submerged vertical circular cylinders.On this  basis, we researched the  variations of  scour strength of   downstream flow, horseshoe vortex and tail flow  vortex with  submergence ratio, and revealed  the  mechanism  of submergence ratio affecting  local scour by clear water around the submerged vertical circular cylinders. Research results show that 1)  increasing  submergence ratio could reduce the  effective  length of vertical circular cylinder above water surface  and weaken the resistant  flow and disturbance of the cylinder on water; 2) the  scour capacity of downward flow in the upstream of cylinder, horseshoe vortex around the cylinder, and tail flow vortex obviously decreases, which reduces the  probability of   sediment around vertical circular cylinder being  eroded by vortex.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20150991