过滤燃烧火焰锋面不稳定性的实验研究

实验研究甲烷/空气预混气体在多孔介质燃烧器中燃烧的火焰锋面不稳定特性.结果表明，给定一个初始非均匀预热区域，在当量比为041，流速为042m/s时，在6mm的小球填充床内，火焰锋面由较为规则的对称火焰逐渐演变为倾斜火焰，并最终分裂为上下两个区域.在布置填充床的同时，对填充床进行夯实，降低孔隙率分布不均匀性.在孔隙率均匀的填充床内，初始的非均匀预热区域，使得火焰的传播极其不稳定，最终导致熄火；即使给定初始均匀的预热区域，火焰锋面依然具有一定的不对称性.填充床的结构不均性是过滤燃烧火焰锋面倾斜的主要原因，而初始的不均匀因素将加剧火焰传播的不稳定性.

Experimental Studies on the Flame Front Instability Characteristics in Filtration Combustion

The flame front instability characteristics of the combustion of the methane/air pre mixed gas in the porous media burner were investigated. The experiment results showed that in a particle bed with the ball diameter of 6mm， the flame front changes from the regular symmetrical flame to the inclined flame gradually and split into two areas finally in a given initial uneven preheated zone when the equivalent ratio is 041， and the flow velocity is 042m/s. When the particle bed was arranged， the balls were tamped down to decrease the uneven distribution of porosity. The initially uneven preheated areas in the even distribution of the porosity caused the flame propagated unstably and misfired in the end. Even though the given initial preheated area was even， the flame front was still somewhat unsymmetrical. The results showed that the uneven structure of the particle bed is the main reason that the flame front inclines in the filtration combustion and the initial uneven factor accelerates the instability of the flame propagation.