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 |
相關次數: | 點閱:3 下載:0 |
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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。
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