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유경현(Kyunghyun Ryu),윤용진(Yoongjin Yun),오영택(Youngtaig Oh) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
To effectively meet current regulations on the exhaust emissions of diesel engine required to control the deterioration of air pollution in the whole world, this study is to investigate the effects of water induction through the air intake system on the characteristics of combustion and exhaust emissions in diesel engine.<br/> A method for supplying water through the air intake system to reduce the exhaust emissions has been considered with other methods such as water introduction in the form of water-in-fuel emulsion or water injection directly into the combustion chamber, but it has not been studied about the effects of water induction through the intake port on the engine performance and exhaust emissions in 101 diesel engine in detail until now.<br/> In this study, the effects of water induction through the air intake port were considered in IDI diesel engine. The formation of NOx was significantly suppressed by decreasing the gas peak temperature during the initial combustion process because the water playa role as a heat sink during evaporating in the combustion chamber, but the smoke was slightly increased with increased water amount. Also, NOx significantly decreased with increase in water amount.
운행중인 경유자동차의 천연가스자동차로의 개조 기술 개발
유경현(Kyunghyun Ryu),김봉규(Bongkyu Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The diesel engine used in commercial transportation applications is converted to the dedicated natural gas engine for reducing the exhaust emissions from diesel engine and obtaining the retrofit technology of diesel fuel vehicle to natural gas vehicle. Cylinder head and piston are remodeled into engine parts well suited for the spark ignition engine using natural gas. In this study. the performance and exhaust emissions of retrofit natural gas engine are investigated. From the results, the exhaust emissions of the retrofit natural gas engine has a great effect on the air quality and human health.
디젤엔진에서 경유-CNG 혼합 연소의 성능 및 배기 특성
유경현(Kyunghyun Ryu),박진철(Jinchul Park),최규호(Kyuho Choi),허병무(Byongmu Heo) 한국자동차공학회 2009 한국자동차공학회 지부 학술대회 논문집 Vol.2009 No.10
The purpose of this paper was to investigate the performance and emissions characteristics of a commercial diesel engine being operated in natural gas with pilot diesel ignition. This study showed that the performance of diesel engine with dual fuel increased as the engine load increased and as the injection timing of pilot diesel advanced. The peaks of pressure, pressure rise rate, and heat release rate were increased and the ignition timings of fuel were advanced with the injection timing of pilot diesel. The highest and lowest smoke was exhausted at the timing of pilot injection of BTDC 2℃A and BTDC 2℃A respectively. NOx emissions were exhausted more at the medium and higher load conditions and were increased as the injection timing of pilot diesel advanced.
디젤엔진의 후처리장치로서 플라즈마 시스템에 관한 실험적 연구
유경현(Kyunghyun Ryu),박진철(Jinchul Park),최규호(Kyuho Choi),석동찬(Dongchan Seok),이봉주(Bongju Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The selective catalytic reduction (SCR) system used to reduce NOx in diesel engines requires an NO/NO₂ ratio of about 1 in exhaust emissions to realize the fast SCR mode at temperatures lower than 300°C. This study investigated the characteristics of a plasma system as a pre-active apparatus for the fast SCR reaction mode of an SCR system. Plasma was generated by the pulse corona discharge (PCD) method with a four-channel wire-cylinder reactor. This study showed that plasma was easily generated in the exhaust gas by the PCD system, and the peak voltage of the normal state condition for plasma generation was generally 12 ㎸. The PCD system easily converted NO into NO₂ at lower temperatures and the NO/NO₂ conversion ratio increased with the discharge current for plasma generation. The PCD system also activated the diesel oxidation catalysts (DOC) system to reduce CO emissions.