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研究生:藍斌豪
研究生(外文):Lan Bin-Hao
論文名稱:多向斜衝燃燒器之衝擊效應數值分析
論文名稱(外文):A Numerical Study of Flow Impinge Effect in Hybrid-Entry Impinging Burners
指導教授:楊鏡堂楊鏡堂引用關係
指導教授(外文):Yang, Jing-Tang
學位類別:碩士
校院名稱:國立清華大學
系所名稱:動力機械工程學系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
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:CFDRCflow impinging
相關次數:
  • 被引用被引用:5
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  • 下載下載:20
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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
第七章 參考文獻
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