Abstract: A mathematical model of Catalytic Diesel Particulate Filter (CDPF) was built up. The exhaust parameters and structure parameters were analyzed, and the model was validated through experimental data. The results show that the mass in the filter wall increases steeply and then decreases slowly. Soot distribution in the cake layer has a minimum thickness for appropriately 30% of the total channel length. While, the edges at the inlet and outlet have the maximum thickness. The exhaust parameters, including temperature, flow rate, the concentration of O₂ and the concentration of NO₂, mainly influence the thickness of soot distribution by influencing performance of the NO₂ assisted regeneration. The temperature has the largest influence, and the thickness of soot distribution in the cake layer is more sensitive to the concentration of NO₂ than O₂. The structure parameters, including the ratio of length to diameter, the ratio of inlet diameter to outlet diameter and channel density have significant effects on the shape of the soot distribution in the cake layer. With the increase in the structure parameters, the soot distribution tends to be uneven, and the channel density has the largest impact, which means the position of the lowest point tends to move to the rear end, while the increase in the ratio of inlet diameter to outlet diameter leads the point to move to the front end.

Key words: power machinery and engineering, catalytic diesel particulate filter(CDPF), soot distribution, exhaust parameters