柴油机排气参数与催化型柴油颗粒捕集器结构参数对再生特性影响的数值模拟OA北大核心

To investigate the effects of diesel exhaust parameters and catalytic diesel particulate filter(CDPF)structural parameters on CDPF regeneration characteristics,a combined approach of engine bench testing and numerical simulation was employed.The influences of factors such as exhaust temperature,oxygen volume concentration,exhaust flow rate,NO2 volume fraction,initial soot load,pore density,and wall thickness on CDPF regeneration were analyzed.The results indicate that increasing exhaust temperature,oxygen volume concentration,and NO2 volume fraction can increase the maximum oxidation rate of soot,and reduce regeneration time.The increase in initial soot load improves the maximum oxidation rate of soot,but it does not affect regeneration time.Additionally,the structural parameters of the CDPF also influence regeneration characteristics.With the increase of cell density,the maximum oxidation rate of soot gradually decreases and regeneration time slightly increases.Furthermore,as wall thickness increases,the maximum oxidation rate of soot and the maximum soot oxidation rate gradually decreases,while the regeneration time remains approximately the same.Sensitivity analysis indicates that exhaust temperature,oxygen volume fraction,exhaust flow rate,initial soot load and pore density have a significant impact on the maximum oxidation rate of soot.The influence of the parameters from the greatest to the least is exhaust temperature,initial soot load,oxygen volume fraction,exhaust flow rate,pore density.By contrast,NO2 volume fraction and pore wall thickness have minimal effects on the maximum oxidation rate of soot.Among the parameters studied,only exhaust temperature has a significant impact on regeneration time,while other exhaust and CDPF structural parameters do not significantly affect regeneration time.