本研究發展高速粒子影像測速技術，量測火焰與流場交互作用時的動態特性，利用每秒1000張影像之擷取速度，計算其即時速度場分佈，並進行流場中渦度場分佈、速度變化量分佈、速度擾動量分佈、紊流強度分佈及雷諾剪應力分佈等流場特性分析。所探討之主題為兩向斜衝擊及三向斜衝擊火焰中多股火焰間的交互作用及對穩焰特性之效應，也深入研究鈍體雙噴流燃燒器中，不同空氣噴流速度所形成的流場結構與非預混火焰間的交互作用。
兩向衝擊火焰經相互衝擊後，產生火焰間的交互作用，此交互作用使得兩股火焰產生相互的質量傳遞及熱量傳遞，改變了火焰本身的預熱模式與反應物擴散模式，火焰面反應區之預熱現象除了自身火焰前緣之熱釋放，也同時包括另一火焰之熱釋放，使得反應區預熱效應大幅提升，加上迴流結構效應更加強穩焰效果，反應物之擴散也不只是來自火焰本身之上游，也同時來自另一股預混燃氣，同時，火焰前緣受到流場衝擊拉伸作用，使得火焰前緣產生劇烈變化，火焰型態從分離火焰變化成合併火焰及接觸火焰。
三向衝擊火焰，為兩向衝擊火焰中加入垂直方向之第三股預混火焰，三股預混燃氣的相互衝擊增加了流場中速度的擾動量，更有助於燃氣之混合效益，提高燃燒反應，而三股預混火焰間的交互作用，使得□值為1.0之火焰產生0.75 m/s的垂直方向速度變化量，為其他當量比火焰的2-3倍，火焰型態也從□值為1.5的錐形火焰變為□值為1.0的接觸火焰，火焰面從完整的錐形轉變為內縮至凹槽內，成為三股相鄰的預混火焰。
在鈍體燃燒器中，固定中心燃料噴流的速度並改變外環空氣噴流的速度，形成不同的流場結構並與預混火焰進行交互作用，所形成的流場主要結構分別為環形渦漩及迴流結構，不同的流場結構主導著燃料與空氣的混合特性，因此形成不同的火焰型態，分別為層流火焰、過渡火焰及迴流火焰。在低的空氣噴流速度時，迴流結果並不完整，因此，環形渦流主導流場特性，在高的空氣噴流速度時，則為迴流結構主導著火焰型態。本文同時發現，非預混火焰的振盪行為中，St數隨著外環空氣噴流雷諾數(Rea)增加，但隨著中心燃料噴流雷諾數(Rec)的增加而降低，顯示外環空氣噴流速度及中心燃料噴流速度，對於火焰振盪特性存在著完全不同的效應，並且St數與中心燃料噴流雷諾數(Rec)的倒數存在著St．Rec = C St的關係。
本研究所發展的粒子影像測速儀技術，具有高時序解析及高空間解析能力，能夠獲得時間間隔為1 ms之連續暫態速度分佈，每張粒子影像的畫素為1280× 1024，能夠解析流場中的小尺度結構，除了量測火焰內部之速度分佈，並並進一步將此技術運用於發展微粒子影像測速儀(micro-PIV)，量測微混合器(micro-mixer)及微液珠(micro-droplet)的中暫態流場，有助於了解微流體之運動行為及混合機制。

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