摘要
研究柴油机微粒捕集器(DPF)再生时碳烟燃烧产生的热冲击对提高载体寿命具有重要的意义。利用AVL FIRE建立DPF模型,并验证模型的有效性。分析了在喷油助燃再生条件下DPF载体内温度梯度的分布,并分析了不同的碳烟密度、初始碳烟量以及碳烟分布对温度梯度的影响。研究结果表明:再生中载体后端温度梯度对碳烟分布及初始碳烟量的变化较为敏感。当碳烟的分布趋于载体后端时,载体内温度梯度分布趋于均匀。较高的碳烟密度再生过程相对温和,有利于载体寿命的提高。
During Diesel Particulate Filter （DPF） regeneration, the investigation of thermal shock of soot combustion in the DPF substrate has an important effect on the DPF substrate lifetime. Based on AVL FIRE, DPF model was built and the model validity was verified, The distribution of temperature gradient in DPF of fuel injected regeneration was investigated, and the influence of soot density, initial soot mass and soot distribution on temperature gradient were analyzed. Results show that： the temperature gradient of DPF substrate back-end is sensitive on the soot density and the quantity of initial soot. The soot distribution which closer to the back-end ofDPF substrate can significantly decrease the values of temperature gradient during regeneration. Higher soot density relatively mild regeneration process, and it is conducive to improve the DPF substrate life.
出处
《机械设计与制造》
北大核心
2017年第1期9-12,共4页
Machinery Design & Manufacture
基金
江苏省第九批"六大人才高峰"高层次人才资助(2012-ZBZZ-047)
关键词
DPF
再生
碳烟
温度梯度
DPF
Regeneration
Soot
Temperature Gradient
