English  |  正體中文  |  简体中文  |  Items with full text/Total items : 66984/66984 (100%)
Visitors : 22924984      Online Users : 82
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU 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://ir.lib.ncu.edu.tw/handle/987654321/523


    Title: 矩形建築物高寬比對其周遭風場影響之研究
    Authors: 高昇敬;Shin-Jing Gou
    Contributors: 土木工程研究所
    Keywords: 風洞實驗;邊界層流;裂膜探針;風場;分離剪力層;雷諾剪應力;紊流動能;紊流動能消散率
    Date: 2000-07-18
    Issue Date: 2009-09-18 17:07:02 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 本研究利用風洞實驗來探討一個矩形建築物位於邊界層流中周遭風場流況,研究的目的在於探討建築物風場之影響區域與建築物寬度及高度對風場之影響。實驗是在中央大學的大型邊界層風洞中進行,並使用熱線測速儀配合裂膜探針來量測風場速度,以探討迴流區之流況。實驗結果顯示:(1)?隨建築物寬度增加,建築物前方且Z/H = 0 ~ 1 內之水平風速的減速現象亦增加,一倍柱體高以內建築物上方的加速趨勢也隨之增加,後方流場在寬高比W/H = 1與2之兩組在X/H = 0.5 ~ 4 ,Z/H = 0 ~ 1 之間為低風速區,寬高比W/H = 4與28之兩組建築物後方風速影響範圍在X/H > 5;?寬度改變對風速變化範圍向下游延伸,但高度改變卻不明顯;(2)由建築物前緣邊角發展出之分離剪力層有最大雷諾剪應力與最大紊流動能;(3)建築物後方並無明顯之渦流逸散,無法觀測出逸散頻率;(4)紊流動能消散率隨建築物加寬或加高,影響範圍逐漸變大。 The flow field around surface-mounted obstacles were experimentally investigated in this study. The experiments were conducted in large-scale wind tunnel. The turbulent velocity, kinetic energy, dissipation rate and vorticity distribution were measured by a split-film thermal anemometer and an automatic transversing system. The influence of the aspect ratio of obstacle was systematically studied in this research. The experimental results reveal that the separated shear layer on the top of the obstacle grows stronger as the width and height ratio increases. Also, the wake flow of the obstacle does not have periodic vortex shedding like that of cylindrical wake.
    Appears in Collections:[土木工程研究所] 博碩士論文

    Files in This Item:

    File SizeFormat
    0KbUnknown720View/Open


    All items in NCUIR are protected by copyright, with all rights reserved.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback  - 隱私權政策聲明