剪力流中矩柱之渦散現象研究

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Title:	剪力流中矩柱之渦散現象研究
Authors:	盧博堅;鄭啟明;梁弘昇
Contributors:	淡江大學水資源及環境工程學系;淡江大學土木工程學系
Keywords:	渦散;剪力流;矩柱;剪力流;Vortex Shedding;Shear Flow;Square Prism;Shear Flow
Date:	1996-09
Issue Date:	2010-01-11 10:47:06 (UTC+8)
Publisher:	臺北市：中華民國結構工程學會
Abstract:	本文主要以風洞實驗探討不同高寬比(H/D)之矩柱,在靜止及振動下分別受兩種剪力參數.beta.=0.024及.beta.=0.032 (.beta.=du/dy*D/Uc)之剪力流場作用下,矩柱後方所產生的渦散現象及各格元間之渦散特性,並與在均勻流場中作比較。結果顯示,剪力流場的速度梯度剖面產生縱向渦漩,破壞了渦散現象的二維性,進而在軸向上的渦散頻率呈現階梯狀的格元(cell)現象且隨著矩柱高寬比的增加而格元分界(cell boundary)愈往高速端移動,在同一模型中隨著剪力參數增大而格元分界愈往低速端移動。並由於剪力流速度梯度造成相位變化,在剪力參數增大時相位差拉大且高速端格元長度變長。
Relation:	中華民國第三屆結構工程研討會論文集(二)=Proceedings of the 3th National Conference on Structural Engineering，頁1313-1326
Appears in Collections:	[Graduate Institute & Department of Water Resources and Environmental Engineering] Proceeding [Master's Program, Graduate Institute of Educational Psychology and Counseling] Proceeding

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