本研究是建立一平面火焰爐實驗裝置用以研究在不同當量比、低溫壁面溫度及壁面間距下對層流預混甲烷/空氣火焰結構的影響。實驗方法在定性上，以V8直接拍攝及schlieren光學觀察火焰在兩平行低溫側壁內的火焰結構，定量上則利用S-type熱電偶作溫度場量測。實驗中利用水及矽油的沸點不同改變低溫槽壁面溫度，固定甲烷/空氣混合氣進口速度在室溫下為0.2m/s，改變燃氣當量比及平板間距進行觀察量測。觀測結果顯示，預混火焰在兩低溫壁間，會在schlieren影像中產生一類邊界層區域。V8直接拍攝影像顯示，火焰沿著低溫壁面有拉伸現象產生，在當量比1.0時的火焰拉伸現象明顯。當量比降低則火焰拉伸減弱，至當量比0.7以下拉伸又開始增強。在Φ接近0.4時，火焰會產生不穩定震盪而熄滅。此外，當量比大於1.1時，火焰離開測試區內部，於測試區出口形成雙層火焰。火焰的拉伸現象在兩壁間距較小時較為明顯。當兩壁間距減為7mm時，火焰在點燃後，會迅速傳至爐面附近，並在發生聲響後快速熄滅。矽油槽低溫壁的火焰拉伸較水低溫壁為小。在相同平板間距及當量比時，矽油槽低溫壁內部整體溫度高於水低溫槽。觀察V8直接拍攝影像顯示在兩壁間距為15mm及10mm、當量比1.0∼0.9時，在垂直低溫壁上段有二次火焰的存在。量測的溫度分佈與V8直接拍攝影像的結果相符；溫度分佈亦可解釋schlieren中類邊界層區域形成的原因。此外，在Φ＝0.9、W＝10mm時的溫度分佈量測顯示，二次火焰附近有一局部增溫區域。本研究亦採用甲烷在貧油及富油下的反應機制不同，解釋了何以當Φ≧1.1時火焰無法傳入平板之間、何以Φ＝1.0時火焰在低溫壁附近呈現明顯拉伸，以及何以文獻中甲烷火焰的熄滅間距的極限Φ值（Φ∼1.3）明顯小於其可燃極限Φ＝1.64。

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