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최성무(SUNGMU CHOI),여권구(GWONKOO YEO) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
This paper introduces the ozone-eating radiator that reduces ambient ground level ozone. This system involves placing a catalytic coating on tile car's radiator. As ozone passes over the radiator, the catalyst converts the ozone into oxygen. Air flow rate at frontal radiator was also measured. Ozone conversion efficiencies of coating with different mileage accumulated radiators were measured. From these measurements, DF (Deterioration Factor) was calculated.
HSDI 디젤엔진 흡기메니폴드의 기통간 EGR 분배성에 대한 1D/3D 연동해석
박남섭(Namseob Park),이제형(Jehyung Lee),여권구(Gwonkoo Yeo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Increasingly stringent exhaust emission regulations, which are expected to come into force within the next couple of years will require substantial reduction of NOx as well as particulate emissions. The small-bore, 01 Diesel engines currently being developed may have to use than 50% recirculated exhaust gas in the intake charge to control NOx emission. The compact geometry of the intake systems may lead to mixing problem with these large quantities of EGR and fresh air prior to induction into the cylinder, and lead to cylinder-to-cylinder maldistribution. This maldistribution could possibly result in a situation where is excessive NOx emissions from cylinders getting too little EGR, along with excessive smoke emissions from those cylinders that get too much EGR. In this work, numerical simulation is applied to improve cylinder-to-cylinder distribution of EGR in a 1.5-L Direct-Injection (DI) Diesel engine using 3D CFD coupled with ID engine cycle simulation. Through a combined effort of modeling, design and simulation, manifolds were developed that improved EGR distribution over the original manifolds while minimizing design changes to engine components. The results confirm the capabilities of the CFD, and in addition illustrate interesting insight regarding the cylinder-to-cylinder EGR distribution.
HSDI 디젤엔진 DPF의 포집 및 재생에 관한 3D CFD 해석
박남섭(Nanseob Park),이제형(jehyung Lee),여권구(Gwonkoo Yeo) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
3-D simulation of the soot mass loading and high temperature regeneration of coated diesel particulate filter (CPF) downstream of the diesel oxidation catalyst (DOC) in a 2.0-L EURO Ⅳ diesel engine have been performed successfully using CFD code. The investigations were focused on the approach flow of the DOC and the CPF, soot load distribution inside the CPF and duration and accuracy of the soot burn out and high temperature CPF regeneration.