Abstract
Through visualization and measurement on the cylinder-plate junction flow, we show the horseshoe vortices can be significantly modified by altering the section shape of the cylinder. Both smoke-wire and Laser-Induced-Fluorescence (LIF) are employed to visualize the vortex structures. Laser Doppler velocimeter is used to measure the velocity field in the symmetry plane upstream of the cylinder. Electrical pressure-scanning valve is applied to acquire the pressure on the plate. It is found that, the sharper the frontal shape of the cylinder, the closer the vortex shedding position and the primary horseshoe vortex location to the cylinder. We quantitatively show the variation of the scale and strength of the primary horseshoe vortex, as well as the maximum wall shear stress, when the section shape of the cylinder is varied. The reduced streamwise adverse pressure gradient explains why the horseshoe vortices are significantly suppressed when the frontal shape of the cylinder becomes sharper. At last, we present a swept thin cylinder installed in front of the primary cylinder can be used to suppress the horseshoe vortices, which is greatly effective and easy to implement.
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Qing-Ding Wei: He graduated in the Department of Mathematics and Mechanics from Peking University in 1963. He worked in 7th Institute of Aerodynamic Academy of China as a researcher from 1968 to 1976, and then he worked at Peking University up to now. He received his Ph. D degree in 1981 from the University of Tokyo. Now he works at State Key Laboratory of Turbulence and Complex System (Peking University) as a professor. His research interests are environmental fluid dynamics, experimental fluid mechanics and wind engineering.
Jian-Ming Wang: He is pursuing a PhD in Peking University.
Guang Chen: He received his Master’s Degree in Mechanics in 1999 from the Department of Mechanics and Engineering Science of Peking University. He is currently pursuing a PhD in Johns Hopkins University.
Zhan-Bin Lu: He received his Master’s Degree in Fluid Mechanics from Peking University (China) in 2000, and PhD in Mechanical Engineering from Northwestern University (USA) in 2003. Currently, he is an assistant professor at the Institute of Applied Mathematics and Mechanics, Shanghai University. His research interests are computational fluid dynamics and combustion.
Wei-Tao Bi: He obtained his PhD degree from the Department of Mechanics and Engineering Science of Peking University in 2002. After that, he went to the University of Tokyo and then Universite de Rennes 1 as a postdoc. Now he works as a research scientist at the College of Environmental and Energy Engineering of Beijing University of Technology. His research interests include experimental fluid mechanics, heat and mass transfer, and physics of granular media.
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Wei, Q.D., Wang, J.M., Chen, G. et al. Modification of junction flows by altering the section shapes of the cylinders. J Vis 11, 115–124 (2008). https://doi.org/10.1007/BF03181926
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DOI: https://doi.org/10.1007/BF03181926