English  |  正體中文  |  简体中文  |  Items with full text/Total items : 49378/84106 (59%)
Visitors : 7360731      Online Users : 65
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/36359


    Title: 二維矩形柱所受之橫風向風力
    Other Titles: Acrosswind Forces on Two Dimensional Rectangular Cylinders
    Authors: 鄭啟明;盧博堅;陳紹來
    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: 邊界層;橫向風力;矩形柱;長寬比;升力;渦漩流失;Strouhal數;紊流;壓力係數;Boundary Layer;Acrosswind Force;Rectangular Cylinder;Depth-Width Ratio;Lift Force;Vortex Shedding;Strouhal Number;Turbulence;Pressure Coefficient
    Date: 1991-12-13
    Issue Date: 2010-01-11 10:46:50 (UTC+8)
    Abstract: 本文係以風洞實驗方法探討矩形柱在均勻 紊流場中所受橫風向風力作用之各項特性。實 驗以矩形柱之長寬比,及紊流強度及長度尺度為 參數,量測矩形柱所受之側面風壓 C/sub p/,橫風向 昇力係數C/sub 1/,史特赫數St和橫風向風力頻譜等 ,實驗結果顯示代表幾何形狀的長寬比為影響矩 形柱風向風力的最主要參數。當長寬比接近0.6 時昇力係數會達到一極大值。長寬比愈大則渦 散現象將因分離剪力層流的再附著現象而產生 渦散頻率降低及渦散強度減弱的現象。
    The fluctuating wind loads acting on high rise structures in atmospheric boundary layer is a complex aerodynamic phenomenon. There exists no credible analytical model which can predict wind loads accurately. This research project studied the acrosswind forces on rectangular cylinders in smooth and homogeneous turbulent flows through wind tunnel studies. Depth-width ratio of cylinders and turbulence features were chosen to be the controlled parameters. Pressure coefficient, lift coefficient, Strouhal number and power spectral density of acrosswind forces were measured. The results indicate that the depth-width ratio is the dominant factor in terms of vortex shedding process and the corresponding acrosswind forces. The lift force reaches maximum when depth-width ratio is about 0 .6. For large depth-width ratio the vortex shedding process will be damped significantly due to surface reattachment mechanism.
    Relation: 中華民國力學學會第十五屆全國力學會議論文集(一)=Proceedings of the 15th National Conference on Theoretical and Applied Mechanics (I),頁137-144
    Appears in Collections:[土木工程學系暨研究所] 會議論文
    [水資源及環境工程學系暨研究所] 會議論文

    Files in This Item:

    File Description SizeFormat
    二維矩形柱所受之橫風向風力 _中文摘要.docx摘要15KbMicrosoft Word116View/Open
    二維矩形柱所受之橫風向風力 _英文摘要.docx15KbMicrosoft Word110View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback