Experimental Study and Numerical Analysis on Pressure Drop and Temperature Field Characteristics of Asymmetric Cell Technology Diesel Particulate Filter for Silicon Carbide

Abstract

ABSTRACT Due to its high filtration efficiency, wall-flow diesel particulate filter (DPF) has become the mainstream purification device for particulate matters (PM) of diesel engine all over the world. China VI emission regulations further tightens PM emissions, which puts out higher demands on all aspects of DPF performance. In the paper, experimental and numerical study were conducted on a common-rail diesel engine for the pressure drop and temperature field characteristics of asymmetric cell technology (ACT) diesel particulate filter for silicon carbide (SiC-DPF) with high cell density and thin wall. The results show that the application advantage of ACT DPF is significant under the conditions of higher soot loading and higher engine speed while SCT DPF is more suitable for the conditions of lower soot loading (less than 4 g/L). When ash loading exceeds 30 g/L, the pressure drop of ACT DPF is remarkably lower than that of symmetric cell technology (SCT) DPF. Compared with SCT DPF, the gas flow velocity is faster at the channel outlet and the particulate concentration deposited along the axial direction is more homogeneous for ACT DPF. Therefore, pressure drop is reduced efficiently with the increasing soot loading. Moreover, the regeneration temperatures inside the ACT DPF are uniform and stable, and the peak temperature does not exceed 750°C during active regeneration with the soot loading of 8 g/L, thus regeneration is safe.