數值模擬甲烷在多孔性介質爐燃燒現象及氫氣對其影響之研究

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陳文鈞(Wen-Chen Cheng ) 查詢紙本館藏

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論文名稱

數值模擬甲烷在多孔性介質爐燃燒現象及氫氣對其影響之研究

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摘要(中)

本文以二維模式模擬、計算氣體燃料在多孔性介質燃燒爐中之燃燒現象。文中之數值模擬係利用熱流試算軟體STAR─CD，並於數值模型中加入額外的副程式，以離散座標法解，包含放射、吸收、非等向散射及非灰效應的完整之輻射熱傳方程式。
探討甲烷與空氣混合之燃燒與加入氫氣時對甲烷在多孔性介質爐中燃燒現象之影響。討論當量比、流速、火焰位置對火焰結構的影響。亦探討陶瓷塊之堆疊方式、孔隙率、散射比、光學厚度等不同參數的影響。對氫氣而言，氫氣反應速率較快，需較高入口速度；吹熄或回火狀態下，添加氫氣的火焰位於較下游的位置，最高溫度幾乎不變，但整體爐體溫度有較高的趨勢。

關鍵字(中)

★ 多孔性介質爐
★ 熱輻射
★ 燃燒
★ 當量比

關鍵字(英)

論文目次

目錄
誌謝I
摘要II
目錄III
表目錄VI
圖目錄VII
第一章緒論1
1.1前言1
1.2文獻回顧4
1.2.1多孔性介質爐4
1.2.2輻射模式：離散座標法10
1.3本文研究方向12
第二章數學模式14
2.1基本假設14
2.2統御方程式15
2.3邊界條件18
2.4參數定義20
2.4.1當量比20
2.4.2吹熄極限與回火極限21
2.4.3消散係數22
2.4.4散射比22
2.4.5光學厚度22
2.4.6孔隙率22
2.4.7圓球的平均直徑23
2.4.8熱傳導係數24
2.4.9穿透率25
2.5輻射熱傳方程式25
2.6模擬燃燒的方法30
第三章數值方法33
3.1爐體模型與格點系統33
3.2解題方法34
第四章結果與討論36
4.1程式驗證與實驗結果比較36
4.2吹熄極限與回火極限比較37
4.3當量比之影響38
4.4流速之影響38
4.5火焰位置之影響39
4.6不同爐體結構之影響40
4.6.1不同陶瓷塊堆疊之影響40
4.6.2孔隙率之影響41
4.6.3不對稱因子之影響41
4.6.4散射比之影響43
4.6.5光學厚度之影響45
4.7添加氫氣之影響46
4.7.1吹熄與回火極限比較46
4.7.2不同氫氣比率之影響47
4.7.3不同入口速度之影響48
第五章結論與建議50
5.1結論50
5.2未來研究方向與建議52
參考文獻77

參考文獻

[ 參考文獻]
參考文獻
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指導教授

曾重仁(Chung-Jen Tseng)

審核日期

2001-7-9

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