过滤体结构对柴油机微粒捕集器加热再生过程影响的数值研究

针对车用柴油机微粒捕集器过滤体孔道内的加热再生模型,采用数值模拟方法,对加热再生过程中过滤体孔道内微粒燃烧与壁面温度沿轴向分布以及过滤体结构参数对再生过程的影响规律进行数值研究。结果表明:过滤体的壁面温度从过滤体前端向后端依次升高,且整个过滤体的峰值温度出现在过滤体后端;较小的过滤体壁面厚度会增加过滤体前端的再生时间,缩短后端的再生时间;较小的过滤体长度及较大的过滤体孔道宽度都可使整个过滤体的再生时间缩短。研究结果可为微粒捕集器再生过程的优化提供重要的理论指导。

Numerical study of effect of monolith structure on pyrogenation regeneration process in diesel particulate filter

Based on the pyrogenation regeneration model for a channel of diesel particulate filter,the distribution laws of soot combustion,wall temperature along axis direction during pyrogenation regeneration process and the law of effect of monolith structure on pyrogenation regeneration process were obtained by numerical simulation.The results indicate that,the wall temperature begins to increase in turn from front-end to rear-end and there exists maximum wall temperature in rear-end of monolith.Smaller wall thickness increases the regeneration time of front-end,but decreases the regeneration time of rear-end.Smaller length of monolith and larger channel width decrease the regeneration time of the whole monolith.The results can provide an important theoretical guidance on optimizing the regeneration process.