以火焰作為加熱源係目前最廣泛的熱源取得方法，而平焰式的燃燒器可以產生一均勻的平火焰，其火焰緊貼於火焰爐嘴出口，火焰形態不會受到上層鍋具的靠近而產生擠壓等變化，這時爐嘴孔隙的大小與爐嘴間的距離的關係就相形重要。
　　本研究是利用兩個矩形噴流燃燒器，用來進行貧油燃燒，來探討兩預混火焰間的距離，對火焰結構、火焰溫度分佈、燃燒器可燃極限的影響。
　　結果發現火焰結構在當兩預混火焰接近至一定距離後，火焰會開始互相擠壓，而兩預混火焰之間的溫度也因為熱散失的減少，而有熱集中的現象，造成了火焰面的偏移。而開始產生相互作用的距離則是當兩火焰間的後火焰互相接觸。
　　隨著兩火焰的接近，會有內側火焰穩駐，外側火焰吹熄的現象，換句話說火焰間的相互作用也增加了可燃極限的範圍。

　　Currently flame is the most common way used by human beings for heating. The flat flame burner could produce a even flame which attaches above the outlet of the burner and would not be distributed by the approaching bottom of the pans down stream the flame. Therefore the burner size and the distance between the exit of two burners is relative important to the geometry.
　　For simplifying the problem of flat flame burner, in this research, we used two retangular burner to investigate the effects of the distance between two burner on the temperature distribustion, flame structure and operation range of the premixed flame burners.
　　The results show that when the two burner move closely to each other, the two premixed flame will reject mutually. The heat loss of this phenomenon will be reduced and the heat of combustion will be centralized between the two offset flame sheets. When the two flames’ post-flame contact each other, flames start to interaction.
　　As the two burners keep approach, the flame would be stable in the inner side and blow off in the outer side. In other words, the mutual interaction increases the operation range.

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