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研究生:巫政軒
研究生(外文):WU, CHENG-HSUAN
論文名稱:深寬比1及5的二維矩柱模型於加減速氣流下之氣動力行為探討
論文名稱(外文):Investigation of accelerating and decelerating flow effects on two-dimensional rectangular cylinders with depth/width ratios of 1 and 5
指導教授:羅元隆羅元隆引用關係
指導教授(外文):LO, YUAN-LUNG
口試委員:吳杰勳蕭葆羲羅元隆
口試委員(外文):WU, CHIEH-HSUNSHIAU, BAO-SHILO, YUAN-LUNG
口試日期:2023-07-17
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:土木工程系土木與防災碩士班
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2023
畢業學年度:111
語文別:中文
論文頁數:73
中文關鍵詞:加速氣流減速氣流附加質量係數複數風扇風洞矩形斷面
外文關鍵詞:accelerating flowdecelerating flow,added mass coefficientmultiple-fan wind tunnelrectangular prism
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本研究將聚焦於非定常性流場模擬,以二維方柱和深寬比5之矩柱作為目標結構物進行氣動力係數變化的探討,同時考慮流場靜壓定常性和非定常性的差異,並驗證莫里森方程式在這種情況下的適用性,最後重新定義在非穩態流場下二維鈍體承受瞬間風速變化時的風載重行為。本研究使用淡江大學複數風扇風洞實驗室,模擬低風速(4 m/s)與高風速(14 m/s)在2秒時間內變化的加速及減速氣流來進行實驗。實驗內容分為兩階段。第一階段先針對流場進行探討。首先了解風洞內由上游至下游的靜壓變化。第二階段則進行二維模型的表面風壓量測實驗。觀察在加減速氣流下模型表面風壓隨時間變化的氣動力行為。將流場內靜壓變化與模型表面風壓變化結合,並詳細探討影響設計風載重的氣動力特性。結果顯示。在方柱上,加速氣流引起的非穩態阻力係數變化比深寬比5之矩柱更顯著。深寬比5之矩柱因尾流發展較長,需要較長時間恢復至穩定狀態。加速氣流引起的非穩態擾動升力係數變化在方柱與深寬比5之矩柱上呈現類似的趨勢;但在減速氣流下,兩者則出現相反的結果。此外,由莫里森方程式假設所得出非穩態阻力與擾動升力,通過氣體密度和柱體橫截面積進行正規化,發現所得到的附加質量係數在非穩態流況下並不是固定值。
This study will focus on simulating unsteady flow fields and investigating the variations in aerodynamic coefficients of two-dimensional rectangular cylinders with depth/width ratios of 1 and 5 as target structures. It will also consider the difference between steady and unsteady flow field static pressure and verify the applicability of the Morrison equation. Lastly, the wind loading behavior of two-dimensional bluff bodies experiencing instantaneous changes in wind speed will be redefined under unsteady flow conditions. The experiments will be conducted using the multiple fan wind tunnel laboratory at Tamkang University, simulating low wind speeds (04 m/s) and high wind speeds (14 m/s), with accelerating and decelerating flow changes within a 2-second time frame. The experimental setup comprises two stages. In the first stage, the static pressure change from upstream to downstream in the wind tunnel will be examined. In the second stage, the aerodynamic phenomenon of the rectangular cylinders with depth/width ratios of 1 and 5 under accelerating and decelerating flows will be investigated. By combining the static pressure variations in the flow field with the surface pressure variations on the model, the aerodynamic characteristics affecting the design wind load will be thoroughly examined. The results show that on the square prism, the drag coefficient variations due to accelerating flow are more significant compared to the 1:5 rectangular prism. the reason is that 1:5 rectangular prism requires a longer time to recover to a stable state due to the longer development of the wake. The lift coefficient variations due to accelerating flow exhibit similar trends for both the square prism and the 1:5 rectangular prism, but opposite results are observed under decelerating flow. Additionally, the drag and lift force obtained from the Morrison equation, normalized by gas density and the cross-sectional area of the prism, are found to be non-constant under unsteady flow conditions.
摘要 i
Abstract ii
誌謝 iv
目錄 v
圖目錄 vii
表目錄 x
1 第一章 緒論 1
1.1 研究動機 1
1.2 研究方法與內容 1
1.3 論文架構 3
2 第二章 文獻回顧 4
2.1 二維方矩柱之穩態氣動力效應 4
2.2 介紹複數風扇風洞 6
2.3 非定常性氣流相關研究 7
3 第三章 理論背景 11
3.1 風洞流場特性 11
3.2 基礎鈍體空氣動力學 14
3.3 時頻分析理論 21
3.4 莫里森方程式 24
4 第四章 風洞實驗與數據分析 27
4.1 風洞簡介 27
4.2 儀器與模型介紹 30
4.3 風洞實驗設置 36
4.4 數據分析方法 39
5 第五章 實驗結果與探討 43
5.1 流場模擬結果 43
5.2 定常氣流下之靜壓變化 44
5.3 加減速氣流下的靜壓變化 45
5.4 定常氣流下之參考文獻比較 46
5.5 加減速氣流下之氣動力參數探討 50
5.6 莫里森方程式 65
6 第六章 結論與未來建議 69
6.1 結論 69
6.2 未來建議 70
7 參考文獻 71

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