Effects of flow distribution on performance of three-way catalytic converter(II) results and analysis
The effects of flow distributions on the light-off,warm-up performance and the temporal variation of the solid temperature were studied through numerical simulation,and an experiment of the flow distribution was carried out.The predicted velocity distribution agreed with experimental results satisfactorily.The following conclusions were obtained from the predicted light-off curves and the steady conversion efficiency,that the light-off time increases and the total outlet conversion efficiency reduces as the flow uniformity index decreases,and the conversion efficiency decreases as the radius reduces due to the reduction of residual time caused by the increase of the velocity.The analyses on the distribution of temperature in the monolith show that the solid temperatures in area near front face rise as the radius increases, and the radial gradient of solid temperature becomes greater as the flow uniformity index decreases.