貧油燃燒符合節能低污染的能源利用方式，但是貧油預混火焰不像擴散火焰有較大的操作區間，當量比過低後火焰也無法穩駐。若使用多個燃燒器， 當燃燒器間距縮小至一定距離後，火焰間有使火燄互相加熱，減少熱散失，進而穩駐火焰的現象。預混貧油火焰如應用此設計原理，使用陣列式的噴嘴，使火燄相互作用並互相穩駐，應可提升操作極限與穩定性。
一般預混噴流火焰低於貧油極限無法穩駐存在，所以相關次極限火焰研究幾乎付之闕如，本論文以實驗研究以預混噴流火焰相互作用的設計來穩駐一低貧油(甚至低於貧油極限)的火焰及其特性，實驗參數包含燃燒器間距離、當量比、預混燃料出口流速以了解火焰的型態、特性、可燃極限及污染量等火焰特性。
結果發現火燄互相作用下有互相擠壓、穩駐的效果，並可利用可穩駐的貧油火燄去幫助當量比低於可燃極限的火燄，使整體當量比下降，降低污染量。

Lean combustion is the most widely used method of obtaining thermal energy with high efficiency and low emissions. However, due to the flammability limit and lean combustion instability, a lean premixed jet flame cannot be sustained when the equivalence ratio is lower than a critical value. Moreover, due to their unstable properties, lean combustion and ultra lean combustion are not easy to be quantitatively investigated. In our previous study, it has been found that lean flames can be stabilized on double rectangular jet burners even when the equivalence ratio is a little bit less than the lean flammability limit.
In the present study, flame characteristics stabilized on a burner composed of three rectangular slot jets is experimentally studied. The effects of equivalence ratio in different jet exits, distance between jets, jet exit velocity on flame stabilization phenomena are studied. The results show that the flammability and stabilization phenomena of central flame can be greatly enhanced by the assistance of the neighboring jets as they move close to the central jet with a distance less than L/d <2. Moreover, the mutual interaction of the flames could help to sustain and stabilize the ultra lean central flame, reduce the total equivalent ratio and decrease the pollution.

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