Experimental observations of an unsteady detached shear layer in enclosed corotating disk flow
Experimental observations of an unsteady detached shear layer in enclosed corotating disk flow
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DOI：
10.1063/1.858756
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发表时间：
1993-10
影响因子：
4.6
通讯作者：
J. Humphrey;D. Gor
中科院分区：
文献类型：
--
作者：
J. Humphrey;D. Gor
在固定的圆柱形封闭空间中高速旋转的一对圆盘之间的无障碍空间中的流动可以分为五个区域，符合理论分析[C.A.Schuler，博士论文，加州大学伯克利分校(1990)；C.A.Schuler等，Phys.流体A2,1760(1990)]。其中一个，图2中的区域III，是由分析预测的轴向排列的分离剪切层，位于RIII/R2≊Γ1/2处，厚度为δIII/R2≊(2 Re)−1/4，其中R2是圆盘的半径，Re是基于R2和圆盘尖端旋转速度(ωR2)的雷诺数，Γ是实验确定的常数。通过粘性扩散，分离的剪切层允许在磁盘间空间中的大部分三维流动(区域II)和围绕旋转磁盘的轮毂的固体旋转中的二维流动(区域IV)之间必须发生的过渡。目前的发现，基于流动显示，证实了这些迄今未测试过的测试结果。
The flow in the unobstructed space between a pair of disks corotating at high speed in a fixed cylindrical enclosure can be divided into five regions amenable to theoretical analysis [C. A. Schuler, Ph.D. Thesis, University of California at Berkeley (1990); C. A. Schuler et al., Phys. Fluids A 2, 1760 (1990)]. One of these, region III in Fig. 2, is an axially‐aligned detached shear layer predicted by the analysis to be located at rIII/R2≊Γ1/2 and of thickness δIII/R2≊(2 Re)−1/4, where R2 is the radius of the disks, Re is the Reynolds number based on R2 and the tip speed of rotation of the disks (ωR2), and Γ is an experimentally determined constant. Through viscous diffusion, the detached shear layer allows the transition that must take place between the bulk of the three‐dimensional flow in the interdisk space (region II) and the two‐dimensional flow in solid body rotation surrounding the hub that spins the disks (region IV). Present findings, based on flow visualization, confirm these hitherto untested t...