本文主要目的在探討多環燃燒器中，各環間隔距離對燃燒流場的影響，以瞭解其燃燒機制的異同。本文採用CFDRC公司所研發之CFD-ACE+套裝軟體，進行多環燃燒器流場模擬，比照各組設計之效能好壞，以做為較佳的設計依據。找到最佳設計參數後，建立實驗平台與燃燒器模型，逐一測試檢驗各參數對火焰結構及操作性能之效應，並作為未來實驗所需模型製作時的參考依據。根據執行結果歸納之設計準則，設計開發高效能之多環燃燒器。
多環燃燒器在改變各環間距時，改變的流場及熱傳效果會直接反映在火焰特性上，進而造成火焰長度與火焰溫度的變化。由數值模擬與實驗結果可知，當燃燒器間距縮短時，火焰間的預熱效果會造成火焰溫度上升，流場溫度均勻化，但同時也會使擴散火焰增長，不利於完全燃燒。在燃燒器的調整上，適當的間距範圍會產生較佳的燃燒效果。由一步有限反應之數值模擬結果得知，當S/d值為2.33時，燃燒器具有較佳之效能表現。在二步反應之模擬結果，其火焰溫度分佈與一步反應也具有類似趨勢，但其分佈位置略有不同，較佳之效能表現落於S/d值為1.67處。
在燃燒器的設計上，改變預混燃氣濃淡時需搭配不同的間距，以提供足夠之二次空氣並達到最佳效能。由本文結果可推論，多環燃燒器在預混燃氣當量比為1.5時，最佳之間距係數S/d值介於2~2.5之間。

The project on multi-ring burner is focused on the effect of the distance between each ring on the combustion performance and flame stabilization mechanism. Both numerical analysis and simple experimental diagnosis have been systematically carried out. The governing equations for the combustor model are solved by a CFD-RC software. Changing the variable in simulation, the results are used to be the design basis in the future. When the distance between each ring of the burner is systematically varied, the reacting flow field and heat transfer alter drastically, and which directly affect the flame structure, flame length and flame temperature. When the burners’ gap decreases, flame temperature rises and flow temperature becomes uniform, but flame length increases. The overall effect is negative to combustion performance. The optimal value of the range between each burner and the re-distribution of the equivalence ratio result in better combustion effect. The best operating range of S/d value was around 2.33 in one-step reaction but around 1.67 in two-step reaction. In the design rule, the best design region of S/d value locates between 2 and 2.5 in the case which equivalence ratio is 1.5.

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