| Citation: | BAO Feng, ZENG Hualun, ZOU He, et al. Mechanism and experimental research on fluid flow in annulus of coaxial rotating conical cylinders[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(8): 1577-1586. doi: 10.13700/j.bh.1001-5965.2017.0614(in Chinese)
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The research on the flow fluid in the annulus of coaxial rotating conical cylinders originates from the classical Taylor Couette flow in the annulus of two coaxial rotating conical cylinders. This paper uses flow visualization experiments and PIV to display and quantify the internal flow field in the annulus of conical cylinders, and the periodic trends of vortex motions are studied to explore the effect of in-annulus Reynolds stress distribution and water level on the flow field. The study indicates that the periodic trends of vortex column move downward over time, and a series of alternate clockwise and anticlockwise vortices are uniformly distributed inside the annulus where pulse number is 100 pulse/s. There exists the alternating vortex fracture periods where pulse number is between 200-500 pulse/s. Under three different water levels, there exists obvious periodic fracture, but the periodic time and number of vortices are different. There are two types of flow (up-convex outward flow and down-concave inward flow) in the mean flow field, and the type of flow is decided by centrifugal force and static pressure. Radial normal stress dominates in Reynolds stress distribution and mainly exists in the middle of the annulus.
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