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研究生:林彥伸
研究生(外文):Yen-Shen Lin
論文名稱:以風洞試驗探討氣懸性排放源通過不同排列密度之規則性結構物群之濃度擴散特性
論文名稱(外文):Wind Tunnel Study on the Dispersion Characteristics of Airborne Discharges through Regular Groups of Structures with Different Arrangements.
指導教授:蕭葆羲蕭葆羲引用關係
指導教授(外文):Bao-Shi Shiau
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:河海工程學系
學門:工程學門
學類:河海工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:89
中文關鍵詞:風洞氣懸性擴散排列密度
外文關鍵詞:wind tunnelairborne gasdispersiondifferent arrangements.
相關次數:
  • 被引用被引用:2
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本文研究係利用環境風洞實驗進行模擬固定源排放氣懸性污染物於不同疏密排列之結構物群之濃度擴散特性。利用立方體結構物之不同排列間距G/H=1、2、3 (G:排列間距; H結構物高度) 以規則性排列出25%、11%、6%之不同排列密度,產生三種較具代表性之紊流特性流場型態。並探討不同風向角0、15、30、45度對於氣懸性污染物之煙流通過三種排列密度所造成濃度擴散特性變化。
實驗分析結果顯示:(1)當氣流通過不同排列地形時,因風速及紊流強度的改變,而導致排列密度較大時,會出現排放之污染物水平濃度擴散範圍變大。(2)氣流通過第一列結構物時,會出現濃度抬升現象。(3)於下游斷面X=13H處水平向濃度擴散較平緩,且高程Z=3H以上風場變化已較不受結構物排列密度的不同所影響,另外在垂直向濃度變化也呈現較平緩。
The wind tunnel experiments were conducted to study the effects of different structure group of area density on the dispersion characteristics of continuous discharge of airborne gas. Various area densities (25%、11% and 6%) and different wind directions (0°、15°、30°and 45°) cases were run experimentally.
Experimental results show that when the flow pass through the different arrangement of structure group, the changes of wind speed and turbulence intensity affect signification the airborne gas concentration of the horizontal distribution. Results also indicate that the airborne gas plumes were elevated in the first row of structure group. The arrangement of structure groups is found to be less influenced for the wind field and the airborne gas concentration at the downwind distance and the height exceed 13H and 3H.
摘要 I
Abstract II
目錄 III
圖表目錄 VI
符號說明 X
第一章 導論 1
1.1研究動機 1
1.2研究目的 2
1.3文獻回顧 2
1.4 研究方法及內容 4
第二章 風洞模擬之理論分析 5
2.1 中性大氣紊流邊界層 5
2.1.1大氣邊界層厚度 5
2.1.2平均風速剖面 6
2.1.3紊流強度 8
2.1.4雷諾應力 9
2.1.5紊流速度擾動頻譜 10
2.2 風洞模擬之相似性法則 10
2.2.1 幾何相似性 (geometrical similarity) 11
2.2.2動力相似性 (dynamic similarity) 11
2.2.3熱力相似性 (thermal similarity) 13
2.2.4起始與邊界條件相似性(initial and boundary condition similarity) 13
2.3地形與結構物對煙流擴散之影響 14
2.4高斯擴散理論 15
2.4.1 非高斯分佈之擴散尺度 16
2.5濃度之因次分析 17
第三章 實驗設計與配置 19
3.1實驗程序 19
3.2實驗設計 20
3.2.1迫近流場模擬設計 20
3.2.2迫近流場量測設計 20
3.2.3 結構物模型設計與排列配置 21
3.2.4追蹤氣體排放設計 23
3.2.5濃度場採樣點設計 23
3.2.6速度場偵測點設計 24
3.2.7實驗物理條件設計 25
3.3實驗儀器 27
3.3.1環境風洞 27
3.3.2迫近流場量測系統 28
3.3.3濃度場量測系統 30
第四章 實驗結果與分析討論 34
4.1迫近流場模擬結果 34
4.1.1平均風速剖面 34
4.1.2紊流強度 35
4.1.3雷諾應力 35
4.1.4風速頻譜 36
4.2速度場分佈特性 37
4.3氣懸性氣體擴散特性 38
4.3.1濃度場分佈特性 39
4.3.2擴散尺度的分佈特性 42
第五章 結論 44
參考文獻 46
附表圖 49
謝誌 89
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