南通大学学报（自然科学版）2017，Vol.16Issue(4)：34-39,6.
不同直径串列双圆柱的可视化实验研究
Visualization Experiments on the Circle Cylinders with Unequal Diameters in Tandem Arrangement
摘要
Abstract
The flow characteristics of circle cylinders with unequal diameters in tandem arrangements were studied.On the basis of an open-loop,recirculating water tunnel,the flow characteristics of circle cylinders with different spacing ratio (Ps/D) were investigated by the method of particular image velocimetry (PIV) for Re =200.It was found that:1)Two flow-pattern regimes including alternating behavior of reattachment and vortex shedding and independent vortex shedding behavior at various spacing ratios have been identified.2)With the increase of spacing ratio,different contours of Reynolds stress from the upstream smaller cylinders can be observed.3)The flow between the two cylinders is steady when the spacing ratio is small.With the increase of the spacing ratio the flow between the two cylinders is turbulent,but the turbulence intensity is lower than the downstream cylinder.When the spacing ratio further increases the turbulence intensity of the flow behind the two cylinders becomes stronger.The findings can provide theoretical reference for the further heat transfer research of circle cylinders with unequal diameters in tandem arrangements.关键词
尾流/双圆柱/流动特性/串列Key words
wake flow/circle cylinder/flow characteristics/tandem arrangement分类
能源科技引用本文复制引用
唐炼蓉,赵亮,周杰,颜锐,喜冠南..不同直径串列双圆柱的可视化实验研究[J].南通大学学报（自然科学版）,2017,16(4):34-39,6.基金项目
国家自然科学基金项目(51476080) （51476080）
