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Experimental Investigation of Juncture Vortex

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dc.contributor丁肇隆en
dc.contributor林銘崇en
dc.contributor.authorKuo, Ting-Weien
dc.creatorKuo, Ting-Weien
dc.date2004en
dc.date.accessioned2007-11-26T01:00:00Z
dc.date.accessioned2018-06-28T21:00:24Z
dc.date.available2007-11-26T01:00:00Z
dc.date.available2018-06-28T21:00:24Z
dc.date.issued2004
dc.description.abstractABSTRACT A Particle Image Velocimetry（P.I.V.）techniques was used in a circulation water tank to measure the juncture vortex which is formed near the intersection of two different models ( circular cylinder and NACA0018) on a flat plate. Four cases with different Reynolds numbers were tested. The results show a vortex system occurs at the symmetry plane of the flow field. It was found the center of main vortex is no fixed. However no obvious relation was found between the center positions and Reynolds numbers. It showed that the main vortex centers are distributed closer to models in NACA0018 cases than in cylinder cases. Therefore, it is concluded that the model geometry affects the locations of main vortex center. Based on the measured velocity field, the vorticity and total circulations were calculated. It shows that the maximum vorticity and total circulation increase as Reynold number increases. It also found that the total circulations obtained in NACA0018 cases are smaller than in the cylinder cases.en
dc.description.tableofcontents目 錄 ___________________________________________ 中文摘要 Ⅰ 英文摘要 Ⅱ 目錄 Ⅲ 圖目錄 Ⅵ 表目錄 Ⅹ 符號說明 ⅩI 第一章 緒論 1 1-1 研究動機………………….. …………………………...1 1-2 文獻回顧 3 1-3 本文組織 …………9 第二章 實驗設備佈置與方法 ..10 2-1 實驗設備 ………………………………………...…….....10 2-1.1 空蝕水槽……………………………………….....10 2-1.2 雷射.………………………………………………11 2-1.3 高速攝影機…………………….…………………11 2-1.4 光學透鏡組…………………………………….…12 2-1.5 懸浮顆粒…………………………………….……12 2-2實驗佈置及步驟……………………………………….13 2-2.1 實驗佈置……….……………………………..….13 2-2.2 實驗步驟…………..………………………….....15 第三章 影像分析及處理………………………….......21 3-1質點辨識…………………………….…….………………..21 3-2瞬時速度場分析……………………………….…………..23 3-2.1 應用相關運算原理之演算法……………………...24 3-2.2 應用類神經方法辨識質點運動………………….25 3-3流場渦度及環流量之分析……………..…….…………..28 3-4影像分析處理流程……..…………….……………………29 3-5渦心位置抓取之分析…..……………….………………...31 第四章 實驗結果與討論 …32 4-1 入流速度之率定 32 4-1.1入流速度之量測…………….………………………32 4-1.2入流端穩定流之量測………………………………36 4-2 接面渦漩之定性描述 40 4-2.1圓柱體之流場描述……….……………………..40 4-2.2 NACA0018翼形體之流場描述…………………..47 4-2.2渦旋中心變動分佈………………………………...49 4-3 接面渦漩之速度向量場分析 52 4-4接面渦漩之渦度場及環流量分析 59 4-4.1接面渦漩之渦度場分析……….…………………59 4-4.2接面渦漩之環流量分析…………………………...61 第五章 結論與未來展望 67 5-1 結論……………………………………………………….67 5-2 未來展望…………………………………………………..69 參考文獻…………………………………………… ….70zh_TW
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dc.format.mimetypeapplication/pdf
dc.identifierzh-TWen
dc.identifier.urihttp://ntur.lib.ntu.edu.tw//handle/246246/51103
dc.identifier.uri.fulltexthttp://ntur.lib.ntu.edu.tw/bitstream/246246/51103/1/ntu-93-R91525007-1.pdf
dc.languagezh-TWen
dc.language.isoen_US
dc.relation.reference參考文獻 1. Agui, J.H. and Andreopoulos, J. “ Experimental Investigation of a Three-Dimensional Boundary Layer Flow in the Vicinity of an Upright Wall Mounted Cylinder ,” Journal of Fluids Engineering ,December, Vol. 114, pp.566-576, (1992). 2. Baker, C.J. “ The laminar horseshoe vortex ,” Journal of Fluid Mechanics, vol. 95, part2, pp.347-367, (1979). 3. Baker, C.J. “ The Oscillation of Horseshoe Vortex Systems ,” Journal of Fluids Engineering September , Vol. 113, pp489-495, (1991). 4. Dargahi “ The turbulent flow field around a circular cylinder ,” Experiments in Fluids 8, pp.1-12, (1989). 5. Eckerle, W.A. and Awad, J.K. “ Effect of Freestream Velocity on the Three-Dimensional Separated Flow Region in Front of a Cylinder ,” Journal of Fluids Engineering, March, Vol. 113, pp37-44, (1991). 6. Ballio, F. , Bettoni, C. and Frsnzetti, S., “ A Survey of Time-Averaged Characteristics of Laminar and Turbulent Horseshoe Vortices ,” Journal of Fluids Engineering, June, Vol. 120., pp233-242,(1998). 7. Goldstein, R. J.; Karni, J., “ The effect of wall boundary layer on local mass transfer from a cylinder in crossflow ,” J. H. Transfer 106, 260-267,(1984). 8. Graf, W.H. and Yulistiyanto, B., “ Experiments on flow around a cylinder；the velocity and vorticity fields ,” Journal of Hydraulic Research, Vol. 36, No.4, pp. 637-653, (1998). 9. Hassan, Y.A. and Philip, O.G., “ A New Artificial Neural Network Tracking Technique for Particle Image Velocimetry ,” Experiments in Fluids , Vol.23, pp.145-154, (1997). 10. Mason, P.J., and Morton, B.R. “ Trailing Vortices in the Wakes of Surface-Mounted Obstacles ,” Journal of Fluid Mechanics, Vol. 175, pp. 247-293,(1987). 11. Mohamed Gad-el-Hak and Dennis M. Bushnell “ Separation Control：Review ,” Journal of Fluids Engineering, Vol. 113, pp.5-29, (1991). 12. Roger L. Simpson “ Junction flows ,” Annu. Rev. Fluid Mech. 2001, 33, pp. 415-443, (2001). 13. Ronald, J. Adrian “ PARTICLE-IMAGING TECHNIQUES FOR EXPERIMENTAL FLUID MECHANICS ,” Annu. Rev. Fluid Mech. , Vol.23, pp261-304, (1991). 14. Schwind, R. “ The three-dimensional boundary layer near a strut. ,” Gas Turbine Laboratory. Report No. 67, MIT. (1962). 15. Seal, C.V. , Smith, C. R., Akin, O., and Rockwell, D., “ Quantitative Characteristics of Laminar, Unsteady Necklace Vortex System at a Rectangular Block-Flat Plate Juncture , ” Journal of Fluid Mechanics, Vol. 286, pp. 117-135(1995). 16. Seal, C.V. , Smith, C. R. and Rockwell, D., “ Dynamics of the Vorticity Distribution in Endwall Junctions ,” AIAA Journal, Vol. 35, No. 6, June pp. 1041-1047, (1997). 17. Th. Dracos (Ed.) “ Three-Dimensional Velocity and Vorticity Measuring and Image Analysis Techniques ,” KLUWER ACADEMIC PUBLISHERS, (1996). 18. Tritton, D.J. “ Physical Fluid Dynamics ”, second edition, OXFORD SCIENCE PUBLICATIONS, (1988). 19. Thomas, A. S. W. “ The Unsteady Characteristics of Laminar Juncture Flows ,” The Physics of Fluids, Vol. 30 (2) , pp. 283-285, (1985). 20. 曾慶深 「應用類神經網路在流場影像質點運動辨識」國立台灣大學工程科學及海洋工程學研究所碩士論文，2002年。 21. 彭修慶 「PIV在高速高雷諾數流場量測系統之建立與應用」國立台灣大學工程科學及海洋工程學研究所碩士論文，2003年。 22. 林呈，張國棟，陳謹偉及黃智政「 應用PIV與FLDV於矩形柱體來流端馬蹄型渦流流場特性及渦流結構之研究 」，第22屆海洋工程研討會論文集，第342-349頁，2000年。 23. 林呈，何宗浚，謝世圳和張國棟「 低雷諾數條件下直立平板來流端之穩態馬蹄型渦流特性探討 」，中國土木水利工程學刊，第十四卷，第一期，第53-66頁，2002年zh_TW
dc.subject接面渦漩,渦漩,圓柱體,粒子影像速度儀en
dc.subjectJuncture Vortex,Vortex,NACA0018,P.I.V,Cylinderen
dc.titleExperimental Investigation of Juncture Vortexen
dc.typethesisen
dspace.entity.typePublication

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