多孔介质内气/液燃料过滤燃烧的试验

摘要： 研究了小球自由堆积型多孔介质内丙烷/空气混合气的低速过滤燃烧过程，分析了燃烧室内温度、燃烧波传播速度和排放特性，以及当量比、入口气体速度等参数对过滤燃烧与排放特性的影响；实现了常压下柴油在多孔介质内的预蒸发自维持过滤燃烧，并研究了液体燃料过滤燃烧的温度特性.结果表明：在燃烧的不同阶段，预混合气燃烧波的传播速度与燃烧室内高温区域的范围差别较大；随着当量比增加，燃烧波的平均传播速度降低，燃烧温度升高，排放量增加；随着入口气体速度增大，燃烧波的传播速度增大，排放量降低；液体燃料过滤燃烧的最高温度低于气体燃料的最高温度，且燃烧器的中心温度与壁面温度差异较大.

An Experimental Study of Filtration Combustion of Gas and Liquid Fuel in Porous Medium

Abstract： An experimental study on the premixed filtration combustion of propane/air mixtures in a packed bed consisting of inert ball free accumulated with low velocity was conducted. The condition of combustion chamber temperature, combustion wave propagation speed, and emission load were analyzed, and the influence of gas flow velocity and equivalence ratio on the combustion and the emission characteristics were clarified. Based on the premixed filtration combustion, the pre evaporated self sustaining combustion of diesel in porous media at normal pressure was realized, and the temperature characteristics of liquid fuel filtration combustion were studied.Experimental results show that there are great differences between the combustion wave propagation speed and the region of high temperature in various stages of combustion. With the increase of the equivalence ratio, the average speed of combustion wave is reduced, the combustion temperature is raised, and the emission load is increased. With the increase of the gas flow velocity, the average speed of combustion wave is increased and the emission load is reduced. The highest temperature for liquid fuel filtration combustion is lower than that of gas, and the central temperature of the burner is much higher than that on the wall.
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