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이병호(Byungho Lee),이중섭(Chungseub Yi),김보한(Bohan Kim),정한식(Hanshik Chung) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This study is numerical analysis on EGR Cooler. A numerical analysis has been performed on the phenomenon of turbulent flow inside the casing and tube that in order to validate the experiment results and investigate the detail of distributions. The governing equations are solved using STAR-CCM+ and in the simulation applied standard Κ-ε turbulence model which widely proven in engineering field. It assumed the exhaust gas flow in the exhaust gas recirculation cooler (EGR Cooler) with same direction in homogeneous flow condition. The flow rate of exhaust gas with 283ℓ/min and cooling water flow in 30℃ temperature of the with flow rate of 2ℓ/min, 4ℓ/min, 6ℓ/min and 8ℓ /min, respectively. Moreover, turbulence intensity has been set at 10%. Finally, from experimental studies the coolant (Water) temperature measured was 39.1℃, and numerical analysis shows 39.03℃. Hence we can conclude it is in a good match between experiment and numerical analysis. Since the high heat capacity of water so it did not influenced significantly by surrounding.
자동차용 EGR Cooler에 탄소나노용액 첨가시 강제대류 열교환의 실험적 연구
이병호(ByungHo Lee),이중섭(ChungSeob Yi) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently gasoline direction injector in gasoline engine and exhaust gas recirculation in diesel engine is focusing on the heart of advanced engines. An automotive type exhaust gas recirculation cooler or heat exchanger that is constructed for integral mounting to the engine intake manifold, the cooler being flat and having an engine coolant inlet at one end of an oblong casing, and a coolant outlet at the other end to flow coolant with a U-shaped tube containing EGR gases to be cooled. As particle size is decreased from micron size down to true carbon nano colloid size (<10 ㎚), surface forces are increasingly important. Nano particles at close proximity or high solids loading are expected to show a different behavior than what can be estimated from continuum and mean field theories. This paper use water and carbon nano colloid fluid at normal cooling system of EGR, experimental result showed all good agreement at Re=2.54×10⁴ for the optimal cooling.
이중섭(Chungseub Yi),이병호(Byungho Lee),심규진(Kyujin Shim),이용훈(Yonghun Lee),정한식(Hanshik Chung),이철재(Cheoljae Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This study represents the flow uniformity and pressure drop in catalytic converter. Present research model type is a monolithic catalytic converter. So, this type have been widely used for satisfaction the regulations of pollutant emissions in automobiles. The mean experimental parameter was engine speed and ceramics monolith in the catalytic converter. The exhaust pressure was measured with pressure sensor. The experimental test engine model was used the 124.1cc motorcycle engine. The phase of exhaust pressure with high speed was moved according to increasing engine speed comparing with exhaust pressure with low speed. Also, the distribution of exhaust pressure at the megaphone type is similar with distribution of without monolith at catalytic converter. Present research models was taken as a base model and megaphone type was used for advanced model. Normally, the base type shape is used in automotive exhaust system. But megaphone type is not used in automotive exhaust system. Therefore, Megaphone type is applied newly at motorcycle.