臺灣博碩士論文加值系統

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 本論文係以實驗的方式來觀測多重固態燃料之間火焰延燒與火焰互動，藉由改變燃料的排列方式、燃料間距和燃料寬度時之火焰型態與火焰傳播速度來討論。主要改變之固態燃料幾何排列，包括單一燃料、兩平行燃料、多平行燃料、L字型排列、ㄇ字型排列和口字型排列等六種排列方式，分析火焰與火焰之間的互動情況與對火焰傳播速度的影響。實驗結果發現，單一到多平行的燃料排列，火焰傳播速度隨寬度增加而增加。多平行燃料之火焰傳播速度則因火焰互動影響而與單一燃料時有所不同，其火焰傳播速度會隨間距的縮小而上升，並在某一間距下有最大火焰傳播速度，主要是受到固態燃料間流道縮小而流速增快的流場效應及火焰彼此間熱對流與熱輻射之交互影響，但隨著間距持續縮小，火焰傳播速度反而下降，乃因流場阻力增加，供氧量不足且燃燒熱膨脹與熱釋放受到限制。L字型紙片排列到ㄇ字型再變化到口字型排列時，火焰傳播速度呈現倍數的差距。六種紙片排列形式，若以相同燃料寬度的火焰傳播速度做比較其速度大小，依序為口字型排列、ㄇ字型排列、多平行燃料、兩平行燃料、L字型排列、單一燃料。
 This thesis presents the flame spread behaviors and flame interactions with multiple solid fuels by measuring the flame spread rates for different arrangements of solid geometry, separation distance between solids and the width of the solids. Six types of solid geometric configurations are investigated, including single solid, two parallel solids, several parallel solids, L shape of solids, n shape of solids, and enclosure type of solids.First, most of the solids the flames spread faster as the solid widths become wider. For parallel solids, the flame spread behaviors are quick different with the single fuel flame due to the flame interactions between solids. The flame spread rate increases as the separation distance between the parallel solids decreases. It is because the flow channeling effect and radiation interactions between flames and solids. The flame spread rate reaches the maximum at an intermediate separation distance and then decreases as the separation distance becomes smaller due to the flow resistance and limited thermal expansion. Less oxygen and less heat release hinder the flame spread rate. Secondly, from L shape to enclosure type solids, the flame spread rates show multiplicative increases. To compare the six types of solid geometry studied, the highest flame spread rate is enclosure type of solids, followed by n shape of solids, several parallel solids, two parallel solids, L shape of solids and single solid.
 指導教授推薦書口試委員審定書授權書 iii誌謝 iv中文摘要 v英文摘要 vi目錄 vii圖表目錄 ix第一章 緒論 11.1研究背景與動機 11.2文獻回顧 51.3研究目的 9第二章 實驗設備與方法 102.1測試支架 112.2紙片樣本 112.3點火系統 122.4數位錄影機 122.5實驗觀測箱 132.6風速計 132.7熱電偶 142.8資料擷取系統及個人電腦 142.9實驗步驟 142.10火焰影像觀測分析 152.11火焰傳播速度分析 162.12研究流程 16第三章 誤差分析 243.1固定誤差統計 253.1.1量測溫度誤差 253.1.2影像誤差 253.2實驗量測的不確定性 253.2.1紙片寬度量測誤差 253.2.2紙片長度量測誤差 263.2.3初始溫度量測誤差 263.2.4時間紀錄誤差 263.3實驗數據計算的不確定性 273.4實驗的重覆性 29第四章 結果與討論 484.1單一燃料 484.2兩平行燃料 564.3多平行燃料 734.4 L字型到口字型燃料排列 84第五章 結論 96參考文獻 98