Visualization of three-dimensional flow structures in the wake of an inclined circular cylinder |
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Authors: | Email author" target="_blank">Matsuzaki?K?Email author Shingai?M Haramoto?Y Munekata?M Ohba?H |
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Institution: | 1.Dept. of Mechanical Engineering and Materials Science,Kumamoto University,Kumamoto,Japan;2.Mitsui Miike Machinery Co., LTD,Ohmuta, Fukuoka,Japan |
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Abstract: | In the previous measurements of the aerodynamic sound generated from an inclined circular cylinder, it is reported that the
sound pressure level (SPL) changes with the aspect ratio and the inclined angle. Therefore, we have investigated the changes
in the vortex structure of the wake considered as one of the causes of the SPL variation. Using the low-noise wind tunnel,
the velocity fluctuation in the wake is measured to obtain the correlation length. Moreover, the flow visualization is performed
with a hydrogen bubble method and a numerical analysis method in order to clarify how the wake structure changes by variations
of aspect ratio and inclined angle. As a result of this investigation, it is shown that the spanwise structure of Karman’s
vortex is highly influenced by the interference of Karman’s vortex with the bottom endplate, and that the influence on the
spanwise structure in the wake becomes greater as the aspect ratio decreases and the inclined angle increases. |
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Keywords: | |
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