内燃机工程2017，Vol.38Issue(2)：59-66,8.DOI:10.13949/j.cnki.nrjgc.2017.02.011
DPF主动再生柴油喷雾氧化的试验及模拟研究
Experimental and Simulation Study on Diesel Spray Oxidation During Active Regeneration of DPF
摘要
Abstract
The diesel spray characteristics at the upstream of a diesel oxidation catalyst (DOC) during active regeneration of a diesel particulate filter (DPF) and the diesel oxidation process in the DOC were investigated by means of integrated visualization experiment and numerical simulation.To the end, high-speed photography device was used to capture diesel spray images, and the spray droplet sizes were measured with a phase Doppler particle analyzer (PDPA).Based on the calibration of the diesel spray model and the DOC model, the diesel spray and oxidation process were simulated.Experimental results indicate that the higher the fuel injection rate, the greater the spray cone angle and penetration distance.The injection rate has a greater effect on spray droplet size distribution at the nozzle outlet.The SMD along the axial direction of spray varies with the number of large droplets.Simulation results show that the hydrocarbon distributions in the exhaust pipe and DOC inlet are determined by the diesel spray characteristics.The temperature distribution at DOC outlet has a close correlation with the hydrocarbon distribution at DOC inlet.The spray impingement and gravity force will cause hydrocarbon to accumulate at the bottom of exhaust pipe so that the mass concentration of hydrocarbon is close to 2%.While too much diesel fuel at the bottom of the pipeline will lead to lower temperature of the corresponding area at the bottom of the outlet section of the DOC, which is lower than 450℃.Increasing the length of exhaust pipeline can promote the mixing uniformity of the spray and gas, and alleviate the phenomenon of excessive concentration of diesel fuel at the bottom of the pipeline.关键词
内燃机/柴油机颗粒捕集器/主动再生/喷雾特性/柴油氧化/数值模拟Key words
IC engine/diesel particulate filter(DPF)/active regeneration/spray characteristics/diesel oxidation/numerical simulation分类
能源科技引用本文复制引用
曹东晓,张俊,郭恒杰,帅石金..DPF主动再生柴油喷雾氧化的试验及模拟研究[J].内燃机工程,2017,38(2):59-66,8.基金项目
国家"八六三"高技术研究发展计划项目(2013AA065304) （2013AA065304）
