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本文对甲烷预混气在多孔介质中的火焰传播特性进行了实验研究,在开口竖直管中充填多孔介质,通过改变预混气氧含量使火焰在不同多孔介质中传播并测量火焰传播速度。预混气中氧含量最高达到29％。实验结果表明:多孔介质中甲烷可燃预混气火焰传播速度大于其层流火焰传播速度,可达到5倍以上(当量比的甲烷-空气预混气);多孔介质当量孔直径越大,或预混气层流火焰速度越高,则预混气火焰传播速度越高;多孔介质中可燃混气的火焰传播界限变小,当量孔直径大的多孔介质其界限值较大。实验结果与Babkin提出的多孔介质中的火焰传播机理相符。
In this paper, the flame propagation characteristics of methane premixed gas in porous media were experimentally studied. The open vertical tube was filled with porous media. The flame was propagated in different porous media by changing the oxygen content in the premixed gas and the flame propagation velocity was measured. Premix gas content of up to 29% of oxygen. The experimental results show that the flame propagation velocity of methane-combustible premixed gas in porous media is higher than that of laminar flame by more than 5 times (methane-air premixed gas with equivalent ratio). The larger the equivalent pore diameter of porous media is, The higher the laminar flow flame velocity is, the higher the propagation speed of the premixed flame is. The flame propagation limit of the combustible mixture in the porous medium becomes smaller, and the limit of the porous medium with larger pore diameter is larger. The experimental results are consistent with the flame propagation mechanism in porous media proposed by Babkin.