方柱體在紊流中之風力特性研究(II):三維方 柱在紊流邊界層流場之氣動力特性

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Title:	方柱體在紊流中之風力特性研究(II):三維方柱在紊流邊界層流場之氣動力特性
Other Titles:	Wind Loads on a Square Cylinder in Turbulent Flows (II): Aerodynamics of Three Dimensional Prism in Turbulent Boundary Layer Flows
Authors:	鄭啟明;盧博堅;陳俊吉
Contributors:	淡江大學土木工程學系
Keywords:	風力負載;紊流邊界層流場;長寬比;速度梯度;壓力係數;Wind Load;Turbulent Boundary Layer Flow;Aspect Ratio;Velocity Gradient;Pressure Coefficient
Date:	1992-12
Issue Date:	2014-02-08 19:38:09 (UTC+8)
Abstract:	本文為利用風洞實驗探討在二種不同的邊界層流場中,三維方柱體在不同高寬比條件下, 風力係數及風力頻譜的變化,並藉由實部交相關頻譜、及相關長度等,進行相關性方面之研究。由實驗結果得知,不同逼近流場中之平均速度梯度,為造成不同風力特性之主因。即於高紊流強度之邊界層流場,將減弱週期性渦漩渦散作用,且隨著高寬比之降低,渦散減弱之現象愈為明顯,結果使得建築物橫風向之相關性因而降低。 Experimental studies were conducted to investigate aerodynamics of 3-D square prisms in turbulent boundary layer flows. The neutral atmospheric boundary layer flows were simulated in wind tunnel to represent natural wind passing over open country and urban terrains. The mean and r.m.s. force coefficients, pressure coefficients, power spectral densities and correlation length scales were studied during this research program. Results indicate that the velocity gradient and aspect ratio of square prism are two important factors that affect the wind load characteristics of the square building models.
Relation:	中華民國力學學會第十六屆全國力學會議論文集(一)=Proceedings of the 16th National Conference on Theoretical and Applied M=echanics (I)
Appears in Collections:	[Graduate Institute & Department of Civil Engineering] Proceeding

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