Soot particle distributions inside a diesel particulate filter during soot loading in plateau environment

Abstract

A three-dimensional diesel particulate filter (DPF) simulation model was developed by using AVL software FIRE to study the effects of four factors on soot particle distributions along the axial and radial directions in the DPF after the model accuracy was validated. An orthogonal test method was used to determine the importance and weights of the design of experiments (DoE) factors such as the expanding angle, the number of channels per square inch, and the exhaust mass flow rate. The effects of these factors on the uniformity of the soot particle distributions were also analyzed. The results show that when the soot loading time was 400 s, the soot particles inside the DPF along the axial direction exhibited a bowl shape, which was high on the both ends and low in the middle. The uniformity of the axial distribution of soot particles reduces significantly with an increase in the number of channels per square inch. The uniformity of the radial distribution reduced with an increase in the expanding angle of the divergent tube. Based on the impacts on the axial uniformity, the three most influencing factors in a descending order are the number of channels per square inch, the exhaust mass flow rate, and the expanding angle of the divergent tube.

Keywords

diesel particulate filter(DPF) / soot particle distribution / plateau environment / pressure loss

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