Separated Shear Layers of Rectangular Prisms in Turbulent Flows

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題名:	Separated Shear Layers of Rectangular Prisms in Turbulent Flows
作者:	Lu, Po-chien;Cheng, Chii-ming;Lai, Chien‐wan;Chang, Chang‐wei
貢獻者:	淡江大學水資源及環境工程學系;淡江大學土木工程學系
關鍵詞:	separated shear layer;turbulence intensity;turbulence length scale;phase average
日期:	2003-09
上傳時間:	2013-07-11 12:01:28 (UTC+8)
出版者:	Taipei : Chinese Institute of Chemical Engineers
摘要:	Rectangular prisms with different depth-to-width ratios (B/D) were placed in flow fields with various turbulence intensities (T.I.) and length scales to study the unsteady structures of separated shear layers. Velocity profiles, turbulence intensity profiles, velocity gradient profiles, and wake spectra of the prisms were measured. When B/D=.4 to 1., differences between the acceleration and deceleration phases of these profiles were prominent, indicating strong vorticities especially when B/D= .6. These differences, also supported by the spectra peaks, became less obvious when B/D=2. and 3.. The approaching field T.I. had a larger effect than the length scale. Higher T.I. led to increased intensity, flow mixing, and thickness of the boundary layer, but weaker wake vorticity.
關聯:	Journal of the Chinese Institute of Engineers=中國工程學刊 26(5), pp.721-727
DOI:	10.1080/02533839.2003.9670826
顯示於類別:	[土木工程學系暨研究所] 期刊論文 [水資源及環境工程學系暨研究所] 期刊論文

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