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석유액화가스엔진에서 수소첨가에 의한 희박연소 특성 연구
오승묵(Seungmook Oh),김정환(Junghwan Kim),이용규(Yonggyu Lee) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
Combustion and emission characteristics were investigated in LPG engine with hydrogen addition. At λ=1.7 and 2.0, high combustion stability was found with hydrogen even though its change was small at λ=1.0 and 1.3. Stable operation of the engine was presented even at λ=2.0, if the amount of hydrogen gas was near 63% volume fraction (15% of total energy). High in-cylinder temperature due to hydrogen combustion resulted in further heat loss to surroundings. Except for λ=1.0, with larger blending of hydrogen, CO was reduced significantly but it was not the case at the leaner region. Nitric oxides(NOx) was increased slightly with hydrogen at λ=1.0 and 1.3. However, when λ>1.3, its relative amount of emission was low. NOx was continuously decreased with hydrogen. However, at λ=2.0 NOx was lowered to a factor of 100 at λ=1.0. THC emission was significantly increased as air/fuel ratio close to leaner region due to misfire and partial burn.
오승묵(Seungmook Oh),김창업(Changup Kim),이용규(Yonggyu Lee),박현욱(Hyunwook Park),이준순(Junsoon Lee) 한국연소학회 2019 KOSCOSYMPOSIUM논문집 Vol.2019 No.11
Recently syngas from various resources is widely used for energy and power generation as gasification technologies are improved to a large extent. Syngas combustion in an internal combustion engine have normally many technical challenges with the reason that its heating value is too low to obtain stable combustion. Even though hydrogen is one of main component gases in syngas, another non-combustible or inert gas like CO2 and N2 which deteriorate flame propagation speed occupy a large volume in the gas. In this study engine performance and emission characteristics with syngas were investigated and evaluated for real applications. Successful operations in stoichiometric and lean region were made with high compression ratios and emissions were also reduced with optimized operating parameters.
직접분사식 LPG 및 가솔린 엔진의 연소 및 배기특성 비교 연구
오승묵(Seungmook Oh),이석환(Seokhwan Lee),조준호(Junho Cho),차경옥(Kyoungok Cha) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Combustion and emission characteristics of LPG(Liquefied Petroleum Gas) and gasoline fuels were compared in a single cylinder engine with direct fuel injection. While fuel injection pressure and IMEP(indicated mean effective pressure) were varied with 60, 90, 120 bar and 2 to 10 bar, another parameters for the engine operation as engine speed, air excess, and fuel injection timing were fixed at 1500 rpm, 1.0, and BTDC 300 CA respectively. Experimental results show that MBT timing for LPG is less sensitive to IMEP, and its combustion stablility(COVIMEP) is also better than gasoline fuel. However, LPG is found that thermal efficiency has lower values a little due to increase of pumping loss by higher throttling inherently. Gasoline shows longer burn durations in the early stage of combustion(10% MBF), but when considering total burn duration(90% MBF) gasoline was shorter than LPG for over IMEP 7 bar. Hydrocarbon emissions of gasoline rise to a level of three-fold than those of LPG. In addition, nitric oxides has higher values for gasoline but carbon monoxide for both fuels shows similar level for all test conditions
[연료 및 윤활유부문] 에멀젼 연료를 이용한 디젤엔진의 분무 및 배기특성 연구
오승묵(Seungmook Oh),서희준(Heejun Seo),허환일(Hwail Huh),임경식(Kyungsik Lim),김기선(Kisun Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Experiments have been conducted to investigate the effects of emulsified fuels on the spray characteristics and exhaust emissions in a diesel engine. Four different fuels were examined; diesel, emulsified fuels with water contents which were varied with 13, 15, and 17%. Characteristics of fuel spray were measured by an optical method. PLLIF(planar liquid laser induced fluorescence)<br/> Compared to diesel fuel, emulsified fuels which had relatively high kinematic viscosity showed smaller spray angle and longer spray tip penetration. The Qualitative droplet distributions of emulsified fuels showed. worse atomization process than that of diesel fuel.<br/> As the water contents were increased. PM and NOx could be reduced simultaneously. It was specially noted that the emulsified fuel with 17% water content was obtained best reducing rates, NOx 30% and PM 40%.<br/>
고온고압 조건에서 Two-Photon LIF를 이용한 CO 측정에 관한 연구
오승묵(Seungmook Oh),김득상(Duksang Kim),Paul C. Miles,Will F. Colban 한국연소학회 2007 한국연소학회지 Vol.12 No.4
Carbon monoxide (CO) is not only an important intermediate species in chemical reaction mechanisms of hydrocarbon fuel combustion, but also a crucial pollutant species emitted from automotive engines. To better understand the physical processes impacting CO emissions, the development of laser-based measurement techniques that can visualize in-cylinder CO distributions is desirable. Among these techniques, Laser-Induced Fluorescence (LIF) is a sensitive and species-selective detection technique capable of good spatial resolution. However, some technical matters such as deep UV excitation, severe pressure dependency of the LIF signal, and potential interference from other species have been major challenges for CO LIF application. This study is focused on investigating the feasibility of CO two-photon LIF in a direct-injection diesel engine operating at typical pressure and temperature conditions with commercial grade diesel fuel. Spectroscopic analysis shows that the CO fluorescence signal can be separated from C₂ Swan band or broadband fluorescence from PAHs when the signal is collected near 483 nm. The signal-to-noise ratio of CO LIF deteriorate rapidly as pressure is increased, following P<SUP>-1.49</SUP> which matches the theoretical signal pressure dependency.