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研究生: 藍斌豪
Lan Bin-Hao
論文名稱: 多向斜衝燃燒器之衝擊效應數值分析
A Numerical Study of Flow Impinge Effect in Hybrid-Entry Impinging Burners
指導教授: 楊鏡堂
Yang, Jing-Tang
口試委員:
學位類別: 碩士
Master
系所名稱: 工學院 - 動力機械工程學系
Department of Power Mechanical Engineering
論文出版年: 2004
畢業學年度: 92
語文別: 中文
論文頁數: 55
中文關鍵詞: 流場衝擊多向斜衝燃燒
外文關鍵詞: CFDRC, flow impinging
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  • 本論文以數值方式分析不同流場衝擊下的燃燒現象,使用兩向衝擊型燃燒器與三向衝擊型燃燒器,不同幾何形狀下改變流場型態,並與前人實驗結果做部份比對,比對結果,由於忽略熱輻射影響,導致溫度極值普遍高於實驗值300k,而速度極值也因此較實驗值高出1.4(m/s)。
    由於幾何外型的不同,導致流場型態的不同,進而改變燃氣間的混合方式與熱傳效應,在兩向衝擊型燃燒器方面,凹槽開口內流場型態分為流場衝擊區與低速迴流區,因為此兩區的三維性,使得低速高溫產物堆積於凹槽擋板內,使得燃燒器出口,凹槽擋板形成一個個低速預熱火源,而三向衝擊型燃燒器,則因為第三向開口的緣故,使得凹槽開口原本存在的低速迴流消失,取而代之的是整體向上速度分佈,而凹槽擋板處的流場型態,存在因流場衝擊區擴散而來的流體,和第三向開口向上流體,整體橫向速度較為平整。
    燃燒效率部份,兩型燃燒器由於溫度分佈與溫度極值相差不大,故改以丙烷消耗長度當做燃燒效能指標,二向衝擊型燃燒器使得丙烷分佈短於三向衝擊型燃燒器。


    目 錄 摘 要 i 誌 謝 ii 目 錄 iii 圖表目錄 vi 符號說明 viii 第一章 前 言 1 第二章 文獻回顧 3 2.1 燃料選擇 3 2-2 燃燒模型 7 2-3 火焰模式 7 2-4 流場結構 8 2-5 預熱效應 11 2-6 二次空氣 11 2-7 不完全燃燒 12 2-8 燃燒不穩定 12 2-9 紊流燃燒 13 2-10 火焰間的影響 14 2-11 衝擊效應 14 第三章 物理模式 18 3-1 問題假設 18 3-2 氣相統御方程式 19 3-3 化學反應模式 20 3-4 紊流模式 20 3-5 邊界條件 21 第四章 數值方法 22 4-1 有限體積法簡介 22 4-1-1 對流項離散 24 4-1-2 物理量離散 24 4-1-3 擴散項離散 25 4-1-4 源項線性化 25 4-2 有限差分方程式 26 4-3 SIMPLEC 演算法 26 4-3-1 求解步驟 28 4-3-2 收斂標準 29 第五章 結果與討論 30 5-1 燃燒器幾何外形 30 5-2 兩向衝擊燃燒器當量比(Φ=2.44)分析 32 5-2-1 兩向衝擊燃燒器當量比(Φ=2.44)溫度場分析 32 5-2-2 兩向衝擊燃燒器當量比(Φ=2.44)速度場分析 35 5-3 三向衝擊燃燒器當量比(Φ=2.44)分析 41 5-3-1 三向衝擊燃燒器當量比(Φ=2.44)溫度分析 41 5-3-2 三向衝擊燃燒器當量比(Φ=2.44)速度場分析 44 5-4 燃燒器性能評估 47 第六章 結論與未來展望 49 6-1 兩向與三向衝擊型燃燒器之比較 49 6-2 未來展望 50 第七章 參考文獻 52

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