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对甲烷-空气、丙烷-空气及用惰性气体稀释的甲烷-氧气层状气体间边界面的火焰传播现象进行了实验。燃烧室长度为10cm。使用纹影法及热线风速计对火焰结构进行了详细研究。在有限制的燃烧室中,预混火焰、扩散火焰及对流火焰都出现某些时间滞后。扩散火焰在预混火焰通过后约80ms出现。在通常情况下这些火焰的间隔约为10cm。预混火焰由双重火焰面形成,即在最初的反应带出现之后又出现一个反应带。这些反应面间的温度是固定的,反应面的宽度在理论混合比附近最小,离开理论混合比则逐渐增大。在本实验中经常形成正常传播火焰,测量了各种条件下的传播速度。
Experiments were conducted on the flame propagation of methane-air, propane-air and methane-oxygen lamellar gas diluted with inert gas. The length of the combustion chamber is 10 cm. Flame structure was studied in detail by using the schlieren method and hot wire anemometer. In a limited combustion chamber, there is some time lag between the premixed flame, the diffusion flame, and the convection flame. The diffusion flame appears about 80ms after the premixed flame passes. In general, these flames are spaced about 10 cm apart. The premixed flame is formed by a double flame surface, that is, a reaction zone appears after the first reaction zone has appeared. The temperature between these reaction surfaces is fixed, the width of the reaction surface is the minimum around the theoretical mixing ratio, and gradually increases from the theoretical mixing ratio. In this experiment, a normal propagation flame is often formed and the propagation velocity under various conditions is measured.