Numerical simulation of temperature gradient inside diesel particulate filter
Vehicle Measurement, Control and Safety Key Laboratory of Sichuan Province, School of Transportation and Automotive Engineering, Xihua University, Chengdu, Sichuan 610039, China
Abstract：Based on the onedimensional unsteady model, the influences of key parameters on the filter wall temperature gradients were investigated under the optimal flow rate. The key parameters include filter structure parameters of cell per square inch (CPSI), wall thickness δw, filter length L and thermal conduct factor λ and regeneration conditions of regeneration duration td and regeneration temperature Tmax. The numerical simulation results indicate that with the increase of CPSI, the (dT/dx)max gradually increases. The wall thickness δw has remarkable effect on the (dT/dx)max. When the δw is less than 0.3 mm, the (dT/dx)max decreases with the increase of δw, while the (dT/dx)max nearly remains constantly when the δw is more than 0.3 mm. With the increase of filter length L, the (dT/dx) max decreases sharply. When the λ is less than 1.0 W·(m·K)-1, the (dT/dx)max significantly decreases as the λ increases, the (dT/dx)max lineally decreases when the λ is more than 1.0 W·(m·K)-1. With the increases of regeneration duration time td and temperature Tmax, the (dT/dx)max increases gradually.
2013, Vol. 34 
