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예혼합 수소기관의 Semi-Compression Ignition실현에 관한 연구
김용락(Yongrak Kim),이광주(Kwangju Lee),이종태(Jongtai Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
As feasibility study on semi-compression ignition in an hydrogen pre-mixture engine, making of glow-plug for H2 combustion research and ignitbility of neat hydrogen-air mixture is investigated with compression ratio and equivalence ratio and energy supply to glow by using above research engine. As the result, hydrogen fuel engine operated under compression ratio of ε=10.5~25 is ignited around equivalence ratio equals of Φ=0.23 which is lower compression ratio than that of estimated one. However, backfire will arise when increase the fuel quantity and energy supply to glow.
이광주(Kwangju Lee),김용락(Yongrak Kim),허상훈(Sanghun Hur),이종태(Jongtai Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In order to develop a compression ignition H₂ engine operated under neat hydrogen-air pre-mixture and room temperature conditions, as the first step, the variable compression ratio hydrogen research engine that has higher compression ratio more than 40 was developed in this study. Feasibility of the compression ignition by using high compression ratio, also, was grasped. As the results, it was shown that neat hydrogen-air of ultra lean mixture(equivalence ratio equal to 0.22) is spontaneously ignited at compression ratio 26 which is lower than estimated one without any assist method for promoting self-ignition but has narrow operating regions for equivalence ratio.
수소-공기 예혼합 압축착화 기관의 운전영역 확장을 위한 흡기 온도 증가에 관한 연구
이광주(Kwangju Lee),김용락(Yongrak Kim),이종구(Jonggoo Lee),이종태(Jongtai Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In order to expand the operation region for the compression ignition with hydrogen-air pre-mixture, the operation region, characteristics of combustion and performance were analyzed by increasing intake temperature. As the results, in the case of increasing intake temperature, the minimum compression ratio for possible compression ignition was predictably decreased by increasing temperature of initial compression due to increasing intake temperature. In addition, Fuel-air equivalence ratio expand for Φ=0.54 when intake temperature increase at 100℃. This result is expanded two times than room temperature. But, it was analyzed that difference of real supply energy hardly increased than expansion of equivalence ratio due to increasing intake temperature.
허상훈(Sanghun Hur),이광주(Kwangju Lee),김용락(Yongrak Kim),이종태(Jongtai Lee),김진희(Jinhee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
To understand the development concept of the CNG engine for agricultural and industrial use, the differences of performance between CNG engine converted from agricultural diesel engine and base engine were evaluated by using research CNG engine. Modified parts of the light-duty diesel engine for the small agricultural tractor were used in the development of the research single cylinder CNG engine. It was found that CNG engine converted had 10% lower mean effective pressure and 6 times higher NOx than those of the based agricultural diesel engine. Low temperature combustion for CNG may be considered as one of the strategy to obtain both high power as same as diesel engine and ultra low level NOx emission of the next generation.
이광주(Kwangju Lee),허상훈(Sanghun Hur),김용락(Yongrak Kim),이종태(Jongtai Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In order to grasp the possibility of simultaneously achieving ultra low NOx, high power and high efficiency without backfire in a hydrogen-fueled engine using external mixture injection at high load, as early step the effects of low temperature combustion were analyzed in terms of backfire occurrence, knock and performance enhancement. As the results, it was found that the achievement of backfire control by retarding IVO, high power(above a gasoline engine) and high efficiency(around 37.5%) in a hydrogen-fueled engine is possible around a boosting pressure of 1.7 bar at an equivalence ratio of Φ=0.4.
농공용기관의 CNG화를 하기 위한 연소실형상의 적정화 연구
이종구(Jonggoo Lee),이광주(Kwangju Lee),김용락(Yongrak Kim),이종태(Jongtai Lee),허상훈(Sanghun Hur),장양(Yang Jang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In order to suggest suitable combustion chamber of the CNG engine for an agricultural and industrial use, 5 type of combustion chamber was found performance for combustion chamber to respond high-load and fuel efficiency. The combustion chamber of 5 type was found COV-imep less than 5%. In the case of thermal efficiency Open dish type was better than flat type. NOx was low emission at flat type by minimum flow in cylinder and HC was least emission at open dish Ⅰtype. The CNG engine for an agricultural and industrial was suggested the open dish Ⅱ type among the 5 type of combustion chamber in terms of high-load and suggested the open dish Ⅳ type in terms of fuel efficiency.
이광주(Kwangju Lee),허상훈(Sanghun Hur),김용락(Yongrak Kim),이종태(Jongtai Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In order to grasp the possibility of simultaneously achieving ultra low NOx, high power and high efficiency without backfire in a hydrogen-fueled engine using external mixture injection at high load, the effects of low temperature combustion were analyzed by NOx emission, in-cylinder gas temperature and performance. As the results, it was found that ultra low NOx(almost 0 ppm), high power(above a gasoline engine) and high efficiency(around 37.3%) in a hydrogen-fueled engine is possible around a boosting pressure of 1.7 bar at an equivalence ratio of Φ=0.33.