디젤입자상물질필터의 기하학적 형상변화가 재생과정 중 활성화 특성 및 비정상 온도거동에 미치는 영향에 관한 수치적 연구

Abstract

The minimization of maximum DPF wall temperature and the fast Light-off during regeneration are the targets for the high durability of the DPF system and the high efficiency of regeneration. In order to predict transient thermal response of DPF, one-channel numerical modeling has been adopted. The effect of the ratio of length to diameter (L/D), cell density, the amount of soot loading on temporal thermal response and regeneration characteristics has been numerically investigated under two different running conditions: city driving mode and high speed mode. The results indicate that the maximum wall temperature of DPF increase with increasing ‘L/D’ in ‘High speed mode’. For ‘City driving mode’, the maximum wall temperature decreases with increasing ‘L/D’ in the range of ‘L/D≥0.6'. The maximum temperature decreases with increasing cell density because heat conduction and heat capacity are increased. It is also found that the effect of amount of soot loading on light-off time is negligible.