Research on regeneration characteristics of diesel particulate filter based on fluid-thermal-solid coupling

Abstract

In order to ensure that the diesel particulate filter (DPF) is not damaged during the regeneration process, a DPF regeneration model based on fluid-thermal-solid coupling is established. The temperature, stress and strain distribution during the regeneration process of DPF are analyzed, and the influence of stress and strain on the solid area of porous media under different carbon loads is revealed. The results show that there is an obvious local high temperature region in the center of the plug section of the intake channel and exhaust channel, and the tangential temperature of the inlet and exhaust outlet gradually decreases from the center to the surrounding. With the increase of carbon loads, the peak reaction temperature in the process of regeneration also began to rise. The thermal stress is mainly distributed near the side corners of the porous medium, and the maximum thermal stress is concentrated at the exhaust outlet end. The deformation is mainly concentrated in the solid center area of the plugs at both ends, the deformation amount decreases from the inside to the outside, and the deformation amount of the exhaust end is higher than that of the intake end. It can be found that the central area of the porous medium is the weak point of the structure, which is prone to thermal damage and cracks.