【摘要】 多孔介质发动机是一种新概念内燃机,它能实现均质和稳定燃烧。用改进的KIVA-3V对一种特定结构的多孔介质发动机的工作过程进行了模拟,并讨论了多孔介质初始温度、多孔介质结构特点对其燃烧与工作特性的影响。计算结果表明,在压缩比一定时,多孔介质初始温度是多孔介质发动机能否压燃着火的决定性因素;不同结构的泡沫陶瓷直接影响多孔介质内气固两相的换热,影响燃烧后期缸内温度和多孔介质固相的平均温度。更多还原

【Abstract】 Homogeneous and stable combustion can be realized in a porous medium engine where the combustion chamber is mounted with a chemically inert porous medium(PM).Combustion and working processes of the PM engine fueled with natural gas were simulated by an improved CFD software KIVA-3V.The effects of initial temperature and structure characteristics of the porous medium on the performance of the PM engine were also discussed.Computational results show that the initial temperature of PM is the critical factor in determining the compressed mixture ignitability at a specified compression ratio.The structure characteristics of the PM can directly affect the convective heat transfer between the gas and solid as well as the dispersion effect of the PM,resulting in a substantial impact on the in-cylinder gas temperature distribution and the average temperature of the porous solid phase.更多还原