Numerical Simulation Filter Section of Catalytic Converter in a Disel Engine

Spark ignition and diesel engines are a major source of urban air-pollution. The major Pollutant in exhaust gases of SI engines are oxides of nitrogen (NOx), carbon monoxide (CO),and organic compounds which are unburned or partially burned hydro carbons(HC).To reduce exhaust emission, most new cars have a catalytic converters located in the exhaust system, convert harmful pollutants into harmless gases. The purpose of paper is optimizing of the filter of catalytic converters. As we know the role of filter in uniform distributing of the flow and particles and increase the surface of Reaction. In this paper the porous media model is defined as a cell zone in which the porous media model is applied and the pressure loss in the flow is determined via our inputs as described in momentum equation. To have a numerical simulation, a CFD Software base finite-volume method is used, and to modeling turbulence the RNG k - e turbulent model applied. This program after discretization governing equations on a body fitted coordinate system, that is produced in preprocessor, integrates this equations on control volumes and determines the rate of quantities on control volume faces using order two (upwind) approximations.

Keywords:

Computational , Fluid Dynamics , diesel engines , catalytic converters