Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2362
標題: 縱列圓柱-垂直平板間自激式振盪流場及下游水平板影響之實驗研究
Experimental study on self-excited oscillation of tandem cylinder-vertical plate and the influence of a downstream horizontal plate
作者: 廖景晨
Liao, Jing-Chen
關鍵字: Tandem cylinder-vertical plate;圓柱-垂直平板;self-excited oscillation;水平板;自激式振盪;小波分析
出版社: 機械工程學系所
引用: 1.Alam M.M., Moriya M., Takai K., Sakamoto H.,“Fluctuating Fluid Forces Acting on Two Circular cylinders in a Tandem Arrangement at a Subcritical Reynolds Number, Journal of Wind Engineering and Industrial Aerodynamics, 2003, Vol.91, pp.139~154. 2.Alam M.M., Zhou Y.,“Strouhal Numbers, Forces and Flow Structures around Two Tandem Cylinders of Different Diameters”, Journal of Fluids and Structures, 2008, Vol.24,pp.505~526. 3.Gu Z., “On Interference between Two Circular Cylinders at Supercritical Reynolds Numbers”, Journal of Wind Engineering and Industrial Aerodynamics, 1996, Vol. 62, pp.175-190。 4.Gerrard J.H., “The mechanics of the formation region of vortices behind bluff bodies”, Journal of Fluid Mechanics, 1966, Vol.25,pp.401~413. 5.Igarashi T., “Characteristics of the Flow around Two Circular Cylinders Arranged in Tandem: First Report”, Bulletin of the JSME, 1981, Vol.24, pp.323-331。 6.Igarashi T., “Characteristics of a Flow around Two Circular Cylinders of Different Diameters Arranged in Tandem”, Bulletin of the JSME, 1982, Vol.25, pp.349-357。 7.Jenkins L.N., Khorrami M.R., “Characterization of Unsteady Flow Structures around Tandem Cylinders for Component Interaction Studies in Airframe Noise”, 11th AIAA/CEAS Aeroacoustics Conference, 2005。 8.Kuo C.H., Chein S.M., Hsieh H.J.,“Self-Sustained Oscillations between Two Tandem Cylinders at Reynolds Number 1000”, Journal of Experiment in Fluids, 2008, Vol.44, pp.503~517. 9.Meneghini J.R., Carmo B.S., “Numerical Investigation of Flow around Two Circular Cylinders in Tandem”, Journal of Fluids and Structures, 2006, Vol.22, pp.979~988. 10.Ozono S., “Flow Control of Vortex Shedding by a Short Splitter Plate Asymmetrically Arranged Downstream of A Cylinder”, Physics of Fluids, 1999, Vol. 11, No. 10, pp. 2928~2934。 11.Ozono S., “Vortex Suppression of The Cylinder Wake by Deflectors”, Journal of Wind Engineering and Industrial Aerodynamics, 2003, Vol. 91, pp.91~99。 12.Rockwell D., Lin J.C. and Yang Y., “Flow Past Two Cylinders in Tandem:Instantaneous and Averaged Flow Structure”, Journal of Fluids and Structures, 2002, Vol.16, pp.1059-1071。 13.Sumner D., Price S.J. and Paidoussis M.P.,“Tandem Cylinders In Impulsively Started Flow”, Journal of Fluids and Structures, 1999, Vol.13, pp.955~965. 14.Xu G. and Zhou Y., “Strouhal Numbers in The Wake of Two Inline Cylinders”, Experiments in Fluids, 2004, Vol. 37, pp.248-256。 15.Yang K.S., Hwang J.Y., “Drag Reduction on a Circular Cylinder using Dual Detached Splitter Plates”, Journal of Wind Engineering and Industrial Aerodynamics, 2007, Vol.95, pp.551-564。 16.Yue D.K.P., Papaioannou G.V., Triantafyllou M.S., Karniadakis G.E., “Three-Dimensionality Effects in Flow around Two Tandem Cylinders”, Journal of Fluid Mechanics, 2006, Vol.558, pp.387-413。 17.Zdravkovich M.M., “Flow Induced Oscillations of Two Interfering Circular Cylinders”, Journal of Sound and Vibration, 1985, Vol.101, pp.511-521。 18.周士欽, “具不同直徑與淨間距之並列雙圓柱尾流鎖定特性之研究”, 國立中興大學, 機械工程研究所碩士論文, 2001。 19.簡賢明, “縱列與錯列雙圓柱尾流結構之實驗分析”, 國立中興大學, 機械工程研究所碩士論文, 2002。 20.謝宏杰, “縱列雙鈍體間自激式流場之實驗探討”, 國立中興大學, 機械工程研究所碩士論文, 2007。 21.鄭大瑋, “下游圓柱後方加設隔板對縱列雙圓柱間自激式振盪特性的影響”, 國立中興大學, 機械工程研究所碩士論文, 2008。 22.李政桓, “不同紊流強度作用下圓柱跡流發展之實驗研究”, 國立海洋大學, 河海工程研究所碩士論文, 1996。 23.邱國賢 , “不同紊流強度作用下雙圓柱後跡流場發展之實驗研究”, 國立海洋大學, 河海工程研究所碩士論文, 1997。 24.陳秉祥 , “不同紊流強度作用下雙方柱後跡流場發展之實驗研究”, 國立海洋大學, 河海工程研究所碩士論文, 1997。
摘要: 
本論文係以雷諾數為1000時,探討在圓柱-垂直平板的下游放置水平板與否對鈍體間流場結構的影響。本實驗在低速循環式水槽中進行,以流場可視化先對流場結構作定性方面的觀察,再以光纖雷射都普勒測速儀來為流場作定量量測,藉由小波分析來了解流場瞬間頻率變化。最後,搭配質點影像測速系統進行流場結構的瞬間渦度分布圖以及環流量等之量測,進一步了解圓柱-垂直平板下游加裝水平板與否對雙鈍體間自激式振盪流場特性之影響。實驗結果顯示:在下游無水平板的情況下,圓柱-垂直平板的中心間距範圍為Xc/D=2.5~3.0時,兩鈍體間的流場結構為平順剪力層的結構,而在Xc/D=3.5~5.0時,流場為自激式振盪特性的發生範圍。另外,當下游設置水平板的情況下,則圓柱-垂直平板的中心間距為Xc/D≦2.5是平順剪力層形成的範圍,而中心間距範圍為Xc/D=3.0~5.0是自激式振盪特性發生之範圍。若圓柱-垂直平板的中心間距為Xc/D≧5.5時,則不管下游有無水平板,其流場結構皆是以交替脫離的渦漩結構為主。

This experimental study focuses on the self-excited oscillation between tandem cylinder-vertical plate various streamwise spacings and its influence of a horizontal plate behind the tandem cylinder-vertical plate as the Reynolds number was 1000. The experiments are performed in a low-speed recirculation water channel. The qualitative flow structures were observed by the dye flow visualization technique, and the quantitative velocity were performed by the FLDV systems and analyzed by wavelet transformation. Further, utilizing PIV system acquires the instantaneous vorticity and circulation of the flow structures.It is found that the structures of smooth shear layers occurs between two tandem bluff bodies when the streamwise spacing ranges between 2.5D~3.0D for tandem cylinder-vertical plate without a horizontal feat plate. But, in case with a horizontal plate, the structure of the smooth shear layers exist while the spacing is less than 2.5D.As the streamwise spacing ranges between 3.5D~3.0D, the flow structrure exhibits a self-excited oscillation between the tandem cylinder-vertical without a horizontal plate. However, in case with a horizontal plate, the self-excited oscillation flow structure occurs around 3.0D~5.0D.The flow structure of vortex shedding street occurs while the streamwise spacing in range of Xc/D=5.5~6.5. whether it is with a horizontal plate or not.
URI: http://hdl.handle.net/11455/2362
其他識別: U0005-2508200922351200
Appears in Collections:機械工程學系所

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