전산유체역학을 통한 요소첨가 선택적 촉매환원장치의 질소산화물 저감 예측에 관한 연구

To our knowledge, diesel vehicles are known as compression ignition engines, so diesel emissions contain relatively high levels of nitrogen oxides(NOx) and particulate matter(PM). Specially, NOx is a key ingredient in the formation of unban smog, and contribute to the formation of acid rain. Therefore, diesel vehicle should be equipped with urea-SCR system as high performance catalyst in order to reduce harmful NOx emissions. This paper presents a numerical study of the NOx reduction efficiency of urea-SCR systems using porous media in the three-dimensional CFD code. And tnen multi-phase flow characteristics coupled with chemical reactions of the transport phenomena in the urea-SCR system are predicted numerically using Eulerian-Lagrangian CFD analysis that can be used to compare the experiment results.