The flow between shrouded corotating disks
The flow between shrouded corotating disks
复制标题
带护罩的同转盘之间的流动
DOI：
10.1063/1.857494
复制
发表时间：
1989
影响因子：
4.6
通讯作者：
D. Koga
中科院分区：
文献类型：
--
作者：
S. Abrahamson;J. Eaton;D. Koga
对带冠同旋盘之间的流动进行了实验研究。观察到了三个不同的流动区域：靠近轮毂的固体内部区域，由大的对旋涡主导的外部区域，以及护罩上的边界层区。内部和外部区域是非常二维的，在平行于自旋轴的方向上变化很小。覆盖层边界层区是三维的，包含一对涡度在±θ方向的环状涡。研究了不同的Ekman数(ν/R2Ω)和圆盘的轴向分离对圆盘形状的影响。Ekman数的减小或圆盘轴向间距的增大导致外部区域的大涡减少，内部区域的相对运动增加，从而导致整体混合的增加。在最大的轴向分离和最小的Ekman数处，观察到了内区的共旋涡结构。
An experimental investigation of the flow between shrouded corotating disks has been performed. Three distinct regions of flow are observed: a solid body inner region near the hub, an outer region dominated by large counter‐rotating vortices, and a boundary layer region on the shroud. The inner and outer regions were very two dimensional, with little variation in the direction parallel to the spin axis. The shroud boundary layer region was more three dimensional and contained a pair of toroidal vortices whose vorticity was in the ±θ direction. The effects of varying the Ekman number (ν/R2Ω) and the axial separation of the disks were studied. A decrease in the Ekman number or an increase of the axial separation of the disks resulted in fewer large vortices in the outer region yielding an increase in the relative motion in the inner region with a consequent increase in overall mixing. Corotating vortical structures were observed in the inner region at the largest axial separations and smallest Ekman numbers.