柴油机微粒捕集器复合再生性能及其场协同分析

Composite regeneration performance of diesel particulate filter and analysis of field synergy

基于柴油机微粒捕集器瞬态复合再生机理,建立了CFD三维仿真模型,并利用漩涡破碎燃烧模型和场协同数学模型对柴油机微粒捕集器瞬态复合再生过程的速度矢量和温度梯度进行了数值模拟和场协同分析,结果表明,再生时间为175 s时的微粒捕集器过滤体后端壁面峰值温度达到1 184 K,且其过滤体内速度矢量和温度梯度的协同度最好,最优燃烧再生区域所占最大比值为0.58,表明此时微粒捕集器过滤体内再生燃烧速率最大,其再生效率最高。

Diesel particulate filter regeneration model is established based on the mechanism of transient composite regeneration for diesel particulate filter,and numerical simulation and analysis of field synergy on the velocity vector and temperature gradient during the transient composite regeneration process of the diesel particulate filter are carried out,using vortex crushing combustion model and field synergy mathematical model. The results show that the peak temperature of the particulate filter body rear wall reaches to 1 184 K when the regeneration time is 175 sec,the coordination index between velocity vector and temperature gradient of the filter body is best,the maximum ratio the best burning regeneration region shares is 0. 58,indicating that the regeneration combustion rate is the largest at this moment inside the particulate filter body,with the highest regeneration efficiency.