本文以貧油燃燒為研究主軸，利用實驗方法探討三環燃燒器中，透過三股環形預混火焰間交互作用，拓展貧油可燃極限之效果，並以此為參考基礎，獲得三環非單一當量比之燃燒流場特性，包括火焰型態、溫度場分佈、流場結構、燃燒氣體濃度。結果發現，三股火焰間之交互作用行為，確實有助於貧油燃燒進行，並可拓展貧油燃燒極限，達超貧油燃燒之目標。
二股接近貧油可燃極限之環形火焰彼此輔助燃燒進行，若內環火焰燃料比例過低，會影響外環原先可燃之燃氣，導致整體火焰熄滅。利用內環當量比較高之火焰幫助外環當量比低之燃氣，能使原先不可燃之外環燃氣變得可燃。在流場穩定之大型三環燃燒器中，設定出口流速1 m/s，總當量比及外環當量比0.6，改變內、中環當量比可歸納出四種火焰型態，分別是外無焰、中高型、中低型、及內無焰。其中，中高型中環火焰f =0.45已超出其本身貧油可燃極限0.6，達到利用火焰間保護與交互作用，拓展貧油可燃極限之目的。
四種火焰型態之燃燒特性與當量比息息相關，顯示主宰著初始火焰強度的當量比，影響各項燃燒及流場特性。四種火焰型態中，外無焰溫度分佈不均，一氧化碳生成量過高，燃料轉換率不佳，不是理想的燃氣搭配。中高型、中低型、及內無焰，在溫度場分佈、汙染物濃度表現相近，而中高型燃料轉換率最高，表現優於其餘二者。

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