Investigations on the temperature distribution of the diesel particulate filter in the thermal regeneration process and its field synergy analysis

摘要

In order to enhance the reasonableness of temperature distribution of the diesel particulate filter (DPF), a thermal regeneration model of the DPF is developed to investigate the temperature distribution of the diesel particulate filter in the thermal regeneration process, and the internal temperature and temperature gradient in channels are simulated. Moreover, field synergy theory is used to optimize temperature distribution of the DPF in the thermal regeneration process due to synergy degree between velocity vector and temperature gradient. The results reveal that increase of the exhaust mass flow in the thermal regeneration process will lead to the increase of temperature value from the filter section to the contraction section of along the axial direction, the peak of the radial temperature gradient will appear in the front of the filter section and contraction section, and the maximum value will first decrease and then increase, but the peak of axial temperature gradient will appear in the front of the filter section. When the exhaust mass flow is about 20-30 g/s, there is an optimum flow area for the peak of radial temperature gradient, and the peak of axial temperature gradient will decrease gradually. Moreover, particle load which is less than 5 g/L can avoid the melt failure and the thermal stress damage. (C) 2017 Elsevier Ltd. All rights reserved.