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|標題:||Vortex shedding and surface pressures on a square cylinder at incidence to a uniform air stream|
|期刊/報告no：:||International Journal of Heat and Fluid Flow, Volume 20, Issue 6, Page(s) 592-597.|
|摘要:||This article describes results of experiments on vortex-shedding frequencies and surface pressures of a square cylinder at non-zero angle of incidence. The range of Reynolds numbers was 2000-21 000, but the lower range was emphasized. For Reynolds numbers greater than 5300, the Strouhal number shows a similar trend with changing angle of incidence; that is, a rapid rise in Strouhal number occurs at an angle of around 13 degrees. The occurrence of such a jump in Strouhal number was found to be associated with onset of the flow reattachment, bringing in a strong pressure recovery on the lower side face of the cylinder. For lower Reynolds numbers Re = 2000-3300, the maximum Strouhal number occurs at a relatively higher angle of 17 degrees. Around this angle, the pressure measurements exhibit a rather weak pressure recovery, suggesting a less firm shear-layer reattachment to the side face of the cylinder. The nature of the reattaching flow was further examined by spectral analysis of the fluctuating pressure coefficients measured on the lower side face of the cylinder. (C) 1999 Elsevier Science Inc. All rights reserved.|
|Appears in Collections:||機械工程學系所|
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