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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN 印刷: 1065-3090
ISSN オンライン: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v9.i2-3.40
13 pages

FLOW VISUALIZATION BEHIND THREE CYLINDERS OF EQUAL AND UNEQUAL SPACING

X. W. Wang
Department of Mechanical Engineering, North China Institute of Astronautic Engineering, Langfang, Hebei, P.R. China
H. J. Zhang
Department of Mechanical Engineering The Hong Kong Polytechnic University Hung Horn, Kowloon, Hong Kong
Yu Zhou
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Institute for Turbulence-Noise-Vibration Interaction and Control Shenzhen Graduate School, Harbin Institute of Technology Shenzhen, 518055, China
J. Y. Tu
Centre for Advanced Numerical Computation in Engineering and Science, The University of New South Wales, Sydney 2052, Australia

要約

Turbulent near wakes of three side-by-side circular cylinders with equal or unequal spacing have been experimentally investigated using flow visualization and the hot-wire anemometry. The work aims to understand the effect of unequal cylinder spacing on the vortex streets behind the three cylinders. When the cylinder centre-to-centre spacing is identical, i.e., T1/d = T2/d - 1.5, the flow is symmetric about the centreline, with a wide wake behind the central cylinder and two narrow wakes on each side of the wide wake. The dominant frequency in the narrow wakes is about 5.4 times that in the wide wake. However, as T2/d is slightly increased to 1.6, a remarkable change occurs in terms of the dominant frequencies, vortex formation and downstream evolution. The vortex generation mechanism is also discussed.


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