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多孔介质发动机能够实现发动机内的均质和稳定燃烧.为加深对多孔介质发动机特性的了解,用改进的KIVA-3V对一种形式的多孔介质发动机燃用气体燃料的工作过程进行了模拟,并讨论了多孔介质初始温度和多孔介质结构及燃料喷射时刻对多孔介质发动机实现压燃着火的影响.针对Zhdanok等人的甲烷预-空气预混合气过滤燃烧的实验,用改进的KIVA-3V进行了数值计算以检验模型的合理性,燃烧波的计算结果与实验结果吻合得很好.计算结果表明在压缩比一定时,多孔介质初始温度是决定多孔介质发动机能否压燃着火的重要因素;改变多孔介质的结构会影响多孔介质内气固两相的换热和多孔介质的弥散作用,多孔介质孔隙大小是影响多孔介质发动机压燃着火的主要因素;在上止点附近起喷燃料不能实现多孔介质发动机的压燃着火.
Porous media engines can achieve homogeneous and stable combustion in the engine.In order to deepen the understanding of engine characteristics in porous media, the working process of gaseous fuel for one type of porous media engine is simulated with a modified KIVA-3V The effects of initial temperature of porous media, porous media structure and fuel injection timing on the compression ignition of porous media engines were discussed.According to Zhdanok et al.’s experiments on the filtration and combustion of methane pre-air premix gas, the improved KIVA-3V The numerical calculation is carried out to test the rationality of the model, and the calculated results of the combustion wave are in good agreement with the experimental results. The calculation results show that the initial temperature of the porous media is an important factor that determines whether the porous media can ignite the fire at certain compression ratio. The structure of porous media will affect the heat and gas-solid two-phase heat transfer in porous media and the dispersion of porous media. The pore size of porous media is the main factor that affects the compression ignition of the engine by porous media. In the vicinity of top dead center, Dielectric ignition of the engine.