http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Off-road 차량용 디젤엔진의 배기가스 저감에 관한 연구
조규백(Gyubaek Cho),김홍석(Hongsuk Kim),강정호(Jeongho Kang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
To meet the Tier 4 interim regulation, PM and NOx emission are must be reduced 95% and 30% compare to current regulation, respectively. DOC, Partial DPF and DPF systems could be applied on the off road vehicle diesel engine for reduction of PM. EGR, SCR and LNT are also used to reduce NOx emission. In this research, DPF system and HPL EGR system were investigated to decrease PM and NOx emission on the 56kW off road vehicle. As the results of experiments, DOC and DPF system was very useful to remove PM on engine and had high reduction efficiency. Back pressure was acceptable and the rate of power loss also lower than 5%. In the case of applying HPL EGR system on diesel engine, the NOx reduction was effective in low or middle load due to the high differential pressure between turbocharger inlet and intake manifold. NOx emission decrease according to increasing EGR rate, but THC shows the increasing tendency because of the increased fuel consumption to compensate for the power loss by EGR and DPF.
급속 압축팽창 장치를 이용한 직접분사식 가솔린 기관의 실린더 내 분무 및 연소특성에 관한 연구
조규백(Gyubaek Cho),정용일(Yongil Jeong) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.7
GDI(Gasoline Direct Injection) engine technology is well known as a new technology since it can improve fuel consumption and meet future emission regulations. But the GDI has many difficulties to be solved, such as complexity of injection control mode, unburned hydrocarbon, and restricted power.<br/> A 2-D shape combustion chamber was adopted to investigate mixture formation and combustion characteristics of GDI engine. Spray and combustion experiments were performed by changing the injection timing, injection pressure and in-cylinder flow in Rapid Compression and Expansion Machine(RCEM). Through the experiments, the detailed characteristics of fuel spray and combustion was analyzed by visualizing the in-cylinder phenomena according to the change of injection conditions, and the optimal fuel injection timing and fuel injection pressure were obtained.<br/>
촉매 연소기를 이용한 배기가스 가열기의 차량 적용 평가
조성호(Sungho Cho),박종수(Jongsoo Park),이영재(Yongjae Lee),이춘부(ChunBoo Lee),이규웅(Gyuung Lee),조규백(Gyubaek Cho),김홍석(Hongsuk Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The application of Diesel Particulate Filter (DPF) as after-treatment system has been studied to reduce particle mater(PM) in exhaust gas form vehicle, but there is one challenge which is a regeneration method in the low temperature region. In this study, DPF was heated with heating device that is consisted of two combustion catalyst. Diesel fuel(2'nd fuel) was oxidized on 2'nd combustion catalyst layer which was heated by thermal energy supplied from diesel fuel(1'st fuel) combustion on 1'st catalyst layer. DPF was mainly heating to more than 650℃ with 2'nd fuel and oxygen in exhaust was used as oxidant. An efficiency of 2'nd fuel combustion on 2'nd catalyst layer is dependent on flow rate and oxygen concentration. Thus 2'nd fuel was oxidized when oxygen concentration in an exhaust gas stream is high, but that was oxidized on DOC when oxygen concentration is low. Nevertheless temperature of front of DPF was maintained as 650±50℃ apart from a driving condition of vehicle.
금속폼을 이용한 Partial DPF의 설계 및 전산유체해석 연구
윤천석(Cheon Seog Yoon),조규백(Gyubaek Cho) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.1
DPF(Diesel Particulate Filter)s have been used to reduce the most of PM(particulate matters) from the exhaust emissions of diesel engine vehicles. Metal foam is one of promising materials for the DPFs due to its cost effectiveness, good thermal conductivity and high mechanical strength. It can be fabricated with various pore sizes and struct thickness and coated with catalytic washcoats with low cost. In order to design metal foam filter and analyze the flow phenomena, pressure drop and filtration experiment are carried out. Partial DPF which has PM reduction efficiency of more than 50 % is designed in this paper. Also, CFD analysis are performed for different configurations of clean filters in terms of pressure drop, uniformity index, and velocity magnitude at face of filter. Filter thickness and the gap between front and rear filters are optimized and recommended for manufacturing purpose.
금속 폼 필터의 촉매 코팅에 따른 PM 저감 성능에 관한 연구
안석종(Seokjong An),조규백(Gyubaek Cho),최현하(Hyunha Choi),정용일(Youngil Jeong),이의성(Euisung Lee),오권오(Kwonoh Oh),한승한(Seunghan Han),김경재(Kyungjae Kim),박승룡(Seunglyong Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The air in cities has been heavily polluted by vehicle emissions. Above all, exhaust gases of diesel engines is the principal cause of these air pollutions. DOC is used to reduce harmful emissions, such as HC, CO and PM. But PM reduction rate of DOC is not enough. DPF is necessary to reduce PM and satisfy regulations. Metal foam is the one of promising materials in process on researches. Metal foam filter is available to use with catalytic coating. In case of catalytic metal foam, it reduce efficiency of PM reduction. In this study, we research the cause why efficiency of PM reduction is been worse and find out the most suitable condition.
급속 흡입ㆍ압축ㆍ팽창 장치에서의 내부 EGR율과 밸브 개폐시기에 따른 제어 자발화에 관한 실험적 연구
문건필(Gunfeel Moon),조규백(Gyubaek Cho),이용규(Yonggyu Lee),정동수(Dongsoo Jeong),배충식(Choongsik Bae) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, to meet increasing need for high thermal efficiency and low emission in internal combustion engine. Controlled auto ignition in gasoline engines and homogeneous charge compression ignition are noticed because of their extremely low level of emissions characteristics of NOx and potential in lowering the fuel consumption rate. In this paper, the experimental work using rapid intake, compression and expansion machine was carried out to estimate the feasibility of CAI combustion fuelled methane. It was found that the location of peak cylinder pressure was advanced with the increase of compression ratio and IEGR rate. Also, the burn duration decreased with more retarded exhaust valve open timing.
내부 배기가스 재순환을 이용한 급속 흡입·압축·팽창 장치에서의 제어 자발화에 관한 실험적 연구
문건필(Gunfeel Moon),조규백(Gyubaek Cho),이용규(Yonggyu Lee),정동수(Dongsoo Jeong),배충식(Choogsik Bae) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
In this study, the experimental work using rapid intake, compression, and expansion machine was carried out to estimate the characteristics of CAI combustion. The mixing of the burnt and fresh mixtures was realized with the pre-combustion chamber installed in the exhaust port. Flammable mixture in pre-combustion chamber was ignited and fully burnt before it is introduced into combustion cylinder. Ultimately, the quantitative effect of IEGR rate on CAI was investigated using RICEM, in which temperature and amount of EGR could be controlled with the variation of condition in the pre chamber.