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EGR 및 LNT를 이용한 초희박 연소 가솔린엔진의 NOx 저감에 관한 연구
김홍석(Hongsuk Kim),조규백(Gyuback Cho),우세종(Woosea Jong),정용일(Youngil Jeong) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
Lean burn GDI(Gasoline Direct Injection) engine have been studied for a long time because of its good fuel economy. However, NOx emissions of the lean burn GDI engines are considered as one of unsolved technical issues. The aim of this study was to show the feasibility of EGR and LNT for NOx reduction of the lean burn GDI engine. This study shows that EGR was a effective method for NOx reduction, but EGR rate should be determined by considering combustion stability and fuel consumption rate. Additionally, this study shows the LNT control methods. The effects of lean/rich duration on NOx reduction characteristics were investigated in this study.
이상수(Sangsu Lee),김홍석(Hongsuk Kim),조규백(Gyuback Cho),성낙원(Nakwon Sung) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The soot inception process inside a diesel engine was studied by the analytical models. With the general chemical reaction mechanism for the soot formation, the phase equilibrium concept is considered for the inception process of soot. In the phase equilibrium concept, the soot is formed from the phase change of gaseous carbon atoms as the phase change of gaseous precursors into solid soot under the condition of saturation pressure. These soot models are implemented into the KIVA-3V code. The results from the phase equilibrium model show that the cold fuel-rich core of spray is the main source of soot inception rather than the high temperature flame. The modified soot model showed reasonable results comparing with the experimental results and similar soot distribution inside a cylinder to the other experimental observations.
가솔린 직접분사식 초희박 연소 엔진의 NOx 제어기술에 관한 연구
김홍석(Hongsuk Kim),박철웅(Chulwong Park),이석환(Seokwhan Lee),조규백(Gyuback Cho),정용일(Youngil Jeong) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Lean burn GDI(Gasoline Direct Injection) engine have been studied for a long time because of its good fuel economy. But, NOx emissions of the lean burn GDI engines are considered as an obstacle for mass production. This study shows the NOx emission control technology of the BMW N53 lean burn engine as the state-of-the-art technolgy. Additionally, this study investigates the effect of EGR and retard of spark timing on the reduction of NOx emissions.
희박 메탄-공기 혼합기의 Auto Ignition 연소 특성에 관한 연구
이진수(Jinsoo Lee),차경옥(Kyungok Cha),최수진(Sujin Choi),조규백(Gyuback Cho),정동수(Dongsoo Jeong) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
There are some disadvantages in efficiency for gasoline combustion and in NOx and PM (particulate matter) emission for diesel engine. CAI (controlled auto-ignition) combustion is a recommendable technology to use advantages of gasoline and diesel mixture in the constant volume combustion chamber (CVCC). Flame propagation photos and pressure signals were acquired to verify internal EGR effect according to a hole type adaptor. The hole type adaptor creates a high-speed burned gas jet. It achieved higher flame propagation speed and autoignition due to the effect of geometry and burned gas jet.
수치해석을 통한 메탄-공기 혼합기의 연소 특성에 관한 연구
이진수(Jinsoo Lee),김덕호(Deokho Kim),최수진(Sujin Choi),조규백(Gyuback cho),정동수(Dongsoo Jeong),차경옥(Kyungok Cha) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
There are some disadvantages in efficiency for gasoline combustion and in NOx and PM (particulate matter) emission for diesel engine. CAI (controlled auto-ignition) combustion is an recommendable technology to solve the problem. An adapter was used for induced auto-igmition in Constant Volume Combustion Chamber (CVCC). Flam propagation photos and pressure signals were acquired to verify effect of the adaptor. Theoretical analysis was also performed. <br/> According to the results of experiment, the adaptor creates a high-speed burned gas jet.<br/> And some analytic solutions show the similar results of experiment. But there are some differences between experiments and analytic solutions. It is needed that more computational models for the precise solutions.
플레임트랩에 의한 메탄-공기 예혼합기의 연소특성에 관한 연구
김덕호(Deokho Kim),이재효(Jaihyo Lee),최수진(Sujin Choi),조규백(Gyuback Cho),정동수(Dongsoo Jeong) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.2
Exhaust gas emissions from internal combustion engines are one of the major sources of air pollution. And, it is extremely difficult to increase gasoline engine efficiency and to reduce NOx and PM (particulate matter) simultaneously in diesel combustion. This paper offers some basic concepts to overcome the above problems. To solve the problems. a recommended technique is CAI(controlled auto-ignition) combustion. In this paper, a !lame trap was used to simulate internal EGR(exhaust gas recirculation) effect.<br/> An experimental study was carried out to find combustion characteristics using homogeneous premixed gas mixture in the constant volume combustion chamber(CVCC). Flame propagation photos and pressure signals were acquired to verify the !lame trap effect. The flame trap creates high speed burned gas jet. It achieves higher flame propagation speed and more stable combustion due to the effect of geometry and burned gas jet.
이정민(Jeongmin Lee),성낙원(Nakwon Sung),권오채(Oh Chae Kwon),김홍석(Gyubaek Cho),오권오(Hongsuk Kim),이의성(Euisung Lee),조규백(Gyuback Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Filtration process in a Diesel particulate filter (DPF) of metallic foam, INCOFOAM?HighTemp, has been studied analytically for the effects of filter configurations on pressure drops and filtration efficiencies. The concept of 'unit-cell' is applied for modeling filtration process in the metallic foam that is the prospective material for DPF due to the effectiveness in filtrating nano-scale particles and the large specific surface area for catalytic coating compared to the conventional honeycomb wall-flow monoliths. The structural properties such as strut diameters and porosities are determined from the pictures by a 3D X-ray scope. Permeability and Forchheimer coefficients of the INCOFOAM? HighTemp were obtained from clean filter experiments. Soot particles deposited inside the filter change the local collector diameter, porosity and permeability, which affect the particle filtration efficiencies and pressure drops. The results from the model show that filter length and thickness strongly affect pressure drops and filtration efficiencies, respectively. The optimal combination of filter length and thickness for the radial type DPF is suggested.
내부 EGR 효과를 이용한 활성화학종에 의한 급속연소 특성
이진수(Jinsoo Lee),차경옥(Kyungok Cha),최수진(Sujin Choi),조규백(Gyuback Cho),정동수(Dongsoo Jeong) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Exhaust gas emissions from internal combustion engines are one of the major sources of air pollution. It is extremely difficult to increase gasoline engine efficiency and to reduce simultaneously NOx and PM(particulate matter) in diesel combustion.<br/> This paper offers some basic concepts of overcoming the above problems. To solve the problems, a recommended technique is CAI(controlled auto-ignition) combustion. The internal EGR(exhaust gas recirculation) effect is suggested to realize CAI combustion.<br/> Thus, an experimental study was carried out to achieve internal EGR using homogeneous premixed gas mixture in the constant volume combustion chamber(CVCC). Moreover, two kinds of obstacles were used to simulate internal EGR effect. Flame propagation photos and pressure signals were acquired to verify internal EGR effect. Hole type obstacle creates high speed burned gas jet. It achieves the highest flame propagation speed due to the effect of geometry and burned gas jet. Double mesh type was also found to increase flame propagation speed.