紊流場中振動矩柱之尾跡現象研究

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Title:	紊流場中振動矩柱之尾跡現象研究
Authors:	盧博堅;鄭啟明;高忠人
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;紊流;柱斷面長寬比;紊流強度;Vortex Shedding;Turbulent Flow;Aspect Ratio;Turbulent Intensity
Date:	1996-09
Issue Date:	2010-01-11 16:49:59 (UTC+8)
Publisher:	臺北市：中華民國結構工程學會
Abstract:	本文探討二維矩柱靜止及振動下於均勻紊流場中之渦散(vortex shedding)變化情形,控制參數為矩柱的深寬比;逼近流場的紊流強度與紊流尺度;振動頻率及固定振幅。量測項目為模型軸中間側面和背面中點之單點壓力及尾跡中單點速度量測。實驗結果顯示,紊流強度的增加,會增加剪力層的混合,因而減弱渦散作用,所以平均側面壓力係數(-C/sub p/),背面壓力係數(-C/sub pb/)及擾動性側壓(C/sub p/')及背壓(C/sub pb/')值下降,壓力頻譜,速度頻譜之尖峰值下降且變為寬頻。此變化現象在共振時及H/D=0.6的情況下變化最大。紊流強度的增加,會使壓力係數及頻譜峰值上升。
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1327-1337
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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