O_3/N_2气氛下离线再生DPF的影响因素  

Influencing Factors of DPF Off-Online Regeneration Under O_3/N_2 Atmosphere

作　　者：徐辉[1] 蔡忆昔[1] 李小华[1] 施蕴曦[1] 李伟俊[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《内燃机学报》2016年第1期81-86,共6页Transactions of Csice

基　　金：国家自然科学基金资助项目(51176067);江苏省高校优势学科建设资助项目(PDPA);江苏省"六大人才高峰"资助项目(2013-ZBZZ-036);江苏大学高级人才启动基金资助项目

摘　　要：建立了O_3/N_2气氛下柴油机微粒捕集器(DPF)离线再生的数值模型,探究了气源位置、气源流量和O_3浓度等因素对DPF离线再生的影响规律,并对再生模型进行了验证.结果表明:在O_3/N_2气氛下对DPF进行离线再生,最大温度梯度远小于该DPF的安全温度梯度限值.减小气源距DPF前端的流通距离,适当增大气源流量和O_3浓度均有利于提高再生速率.但O_3浓度过大会导致再生过程中壁面温度峰值显著增大.对DPF离线再生影响因素的数值模拟进行研究,对进一步开展的O_3/N_2气氛下DPF的离线再生试验起到理论指导作用.Effect of the gas source sites,the gas source flow and O_3 concentration on the diesel particulate filter（DPF）off-online regeneration was studied,through numerical model.The numerical model was validated under O_3/N_2 atmosphere.Results show that wall temperature gradient of DPF off-online regeneration is much less than the safe gradient temperature of this DPF under O_3/N_2 atmosphere.Shortening the distance between gas source and the DPF front,increasing appropriate gas source flow rate and O_3 concentration are effective to improve the efficiency of regeneration.However,over high O_3 concentration will lead to the peak of wall temperature a significant increase.DPF off-online regeneration simulation can provide further guidance to the experimental study of DPF off-line regeneration under O_3/N_2 atmosphere.

关 键 词：柴油机 微粒捕集器 离线再生 壁面温度 再生效率 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]