柴油机DPF主动再生时流场背压变化研究  

Effects of Diesel Particulate Filter Active Regeneration on Back Pressure of Flow Field

作　　者：王童 罗福强[1] Wang Tong;Luo Fuqiang(School of Automobile and Traffic Engineering,Jiangsu University,Zhenjiang City,Jiangsu Province 212013,China)

机构地区：[1]江苏大学汽车与交通工程学院

出　　处：《农业装备与车辆工程》2019年第12期13-18,共6页Agricultural Equipment & Vehicle Engineering

基　　金：国家自然科学基金资助项目(51476072)

摘　　要：研究DPF流场分布对汽车尾气碳烟过滤效率具有重要意义。在尾管后喷主动再生的条件下,用三维仿真软件建立柴油机微粒捕集器(DPF)三维模型,模拟柴油机微粒捕集器内部流场特性。针对DPF不同孔道结构和灰分沉积量,对DPF的流场特性和再生背压特性进行分析,并模拟了灰分特性对不同孔道DPF背压的影响。结果表明:大小孔和六边形结构均有利于降低DPF背压和提高流场均匀性和微粒沉积能力,从而延长DPF维护周期。灰分密度、灰分渗透率、灰分分布对DPF背压准确预测影响很大。灰分的沉积将逐渐增加以背压为依据的DPF再生频率。It is very important to study the flow field distribution of DPF for the carbon smoke loading process and filtration efficiency.A three-dimensional model of diesel particulate filter(DPF)was established with simulation software under the condition of after-pipe injection active regeneration,simulating the flow field characteristics of DPF.According to the channel structure and ash deposition of DPF,the flow field and regenerative back pressure characteristics of DPF were analyzed,and the effect of ash characteristics on the back pressure of DPF was simulated.The results show that asymmetric cell and the hexagonal cell are helpful to reduce the back pressure of DPF and improve the uniformity of flow field and particle deposition,thus extending the maintenance period of DPF.Ash density,ash permeability and ash distribution have great influence on the accurate prediction of DPF back pressure.The deposition of ash will gradually increase the DPF regeneration frequency based on back pressure.

关 键 词：柴油机颗粒捕集器 流场均匀性 背压特性 灰分特性 仿真 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]