디젤자동차용 웜업촉매 내의 유동장에 미치는 터보차저 및 배플의 영향에 관한 수치해석

Diesel vehicle is growing in importance in light-duty sector as a way of reducing greenhouse gases due to improved fuel economy. Carbon monoxide, gas-phase hydrocarbon and organic fraction of diesel particulates can be oxidized to harmless products using a diesel warm-up catalyst (WCC). This study investigated the effect of a turbocharger and a baffle on flow fields and temperature distributions in the wee for Diesel vehicles by a numerical analysis. In the case of the wee with the turbocharger, velocity vectors and temperatures of inlet of the wee have the relatively homogeneous distributions by the swirl generated from the turbocharger. Velocity vectors and temperatures of inlet of the wee with the turbocharger and the baffle have the improved distributions in homogeneity compared with the case of the wee without the baffle. The homogeneous flow field and the temperature distribution in the WCC may contribute to improve the conversion performance of the catalysts.