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題名 | 多孔性介質爐中熱增強燃燒現象之數值模擬=Two-Dimensional Modeling of Premixed Combustion in Porous Medium Burners |
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作者 | 曾重仁; 蔡桓宇; | 書刊名 | 力學 |
卷期 | 17:1 2001.06[民90.06] |
頁次 | 頁51-61 |
分類號 | 335.6 |
關鍵詞 | 多孔性介質; 燃燒; 熱輻射; Porous medium; Combustion; Radiation; |
語文 | 中文(Chinese) |
中文摘要 | 本文以數值方法探討二維多孔性介質燃燒爐中之火焰結構。流場為穩態層流流場;由於多孔性介質之熱輻射效應遠比氣體之熱輻射效應來得強,故不考慮氣體輻射;多孔性介質可放射、吸收及散射輻射熱。輻射熱傳方程式則以離散座標法(Discrete-ordinate method)解之;燃燒機制係由單步化學反應式模擬。結果顯示:當量比愈大時,火焰之溫度也愈高,同時火焰的位置也往下游移動;數值模擬與實驗量測的結果趨勢大致相符,惟溫度低了約100K左右。在多孔性介質燃燒爐中之燃燒熱釋放率較自由火焰的熱釋放率高出許多。 |
英文摘要 | Premixed combustion in a porous medium burner was investigate numerically. A two-dimensional steady, laminar flow model was used. A single-step reaction of methane was used for the chemical kinetic model. The model also includes thermal radiation transport of the porous media placed inside the burner. The radiative transport equation was solved by the discrete ordinate method. The results show that, for each equivalence ratio, the flame can be stabilized at various axial locations with different flame speeds. The flame temperature increases with the equivalence ratio and flame speed. Furthermore, the energy release rates are much higher than that of a free flame for the same equivalence ratio as a result of higher flame speed. |
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