中国电机工程学报2017，Vol.37Issue(3)：810-818,9.DOI:10.13334/j.0258-8013.pcsee.152562
水平槽道近壁面附近颗粒尾流特性的高分辨率PIV实验研究
Experimental Investigation on the Characteristics of Spherical Particle Wake in a Horizontal Channel Flow by High Resolution PIV
摘要
Abstract
The characteristics of sphere particle wake in a horizontal channel flow was experimentally investigated under different Reynolds numbers, using particle image velocimetry (PIV). A steel ball of size with 10mm in diameter was used as particle and atomized droplets with peak at about 2.5μm were used as ghost particle. Experiments were performed at Rep=900, 2500, 5000. Time-averaged velocity vectors, patterns of streamlines and vorticity were examined from the point of flow physics for different sphere locations in the range of 0≤G/D≤1.0 where G was the space between the bottom point of the sphere and wall. It was found that for the case of the sphere touching the wall atG/D=0, a large circulation region formed and covered whole the wake flow region, which size was about 1.5 times of particle diameter. At the gap ratios ofG/D=0.25 and 0.5, there is a tendency of the wake to move upward and the two recirculation regions become asymmetric about the sphere centerline. As the gap increased to a value of G/D=1.0, the effect of the wall become weaker dramatically and the asymmetry of streamline decreased. With increasing the gap ratio, the length of the recirculation zone decreased firstly, and then increased.关键词
球形颗粒/尾流结构/水平槽道/近壁面/粒子图像测速法/速度场Key words
spherical particle/wake structure/horizontal channel flow/particle image velocimetry (PIV)/near wall/velocity field分类
能源科技引用本文复制引用
薛志亮,王肖,吴学成,邱坤赞,樊建人,罗坤,岑可法..水平槽道近壁面附近颗粒尾流特性的高分辨率PIV实验研究[J].中国电机工程学报,2017,37(3):810-818,9.基金项目
国家自然科学基金项目(51136006). Project Supported by National Natural Science Foundation of China (51136006). （51136006）
