柴油机微粒捕集器加热再生过程的数值模拟

基于车用柴油机微粒捕集器过滤体孔道内的加热再生模型,采用数值模拟的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的分布规律以及不同再生条件下柴油机微粒捕集器再生过程的规律进行了研究.结果表明:过滤体的壁面温度从过滤体前端向后端逐渐升高,且整个过滤体的峰值温度出现在过滤体后端;提高过滤体初始温度,适当地增大再生气流质量流量、气流含氧量以及微粒沉积量都可加快再生过程,但过大的含氧量和微粒沉积量会造成壁面峰值温度过高,过大的气流质量流量会减慢再生过程.

Numerical Simulation of Pyrogenation Regeneration Process in Particulate Filter of Vehicle Diesel

Based on the pyrogenation regeneration model for a channel of diesel particulate filter,the distribution laws of soot combustion and wall temperature in the axial direction during the pyrogenation regeneration process,as well as the effect of regeneration condition on pyrogenation regeneration process,are investigated by numerical simu-lation.The results indicate that the wall temperature gradually increase from the front-end to the rear-end of the monolith,with a maximum value at the rear-end;and that,with the increase in the initial temperature of the monolith and with the appropriate increase in the gas mass flux,the gas oxygen content and the soot deposit mass,the regeneration process can be effectively speeded up.However,too much oxygen and soot deposit will lead to a much higher wall temperature,and a much larger gas mass flux may slow down the regeneration process.