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연료분무 및 연소 1 : 희박 직접분사 LPG 엔진의 운전영역에 따른 배기특성
김근수 ( Keunsoo Kim ),최대현 ( Daehyun Choi ),김정환 ( Junghwan Kim ),오승묵 ( Seungmook Oh ),김창업 ( Changup Kim ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
The lean-burn direct injection engine can help improve the fuel economy and reduce harmful engine-out emissions in spark-ignition engines. The use of Liquefied Petroleum Gas (LPG) in lean-burn engines has the advantages of being a premixed mixture and decreasing carbonized emission due to its lower carbon contents. In the present study, the emission characteristics of lean-burn direct injection LPG engine at whole operation range were investigated. The torque of the engine was varied from idle to full load for the speed range of 1000rpm-3000rpm. Stoichiometric operation was adopted under idle and high-load condition and lean-burn operation was applied to 40~80Nm operation because of throttle limitation. The selection of optimal injection and spark timing were based on the fuel consumption and combustion stability. The engine test results indicate that simultaneous improvement of fuel consumption and reduction of the NOx emission were realized under the lean-burn regime. However, the Soot emission and carbon based emissions were partially increased under 40Nm condition due to application of Inter-injection Spark Ignition (ISI) strategy.
1.5kW급 PEMFC용 연료처리장치 내 수성가스치환반응기 시동시간 단축을 위한 수치해석
김근수(Keunsoo Kim),김선영(Sunyoung Kim),강인용(Inyong Kang),지현진(Hyunjin Ji),김영철(Youngchul Kim),배중면(Joongmyeon Bae) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
A Proton Exchange Membrane Fuel Cell (PEMFC) system is spotlighted as a military power source, which has many benefits such as mobility, efficiency and quietness. PEMFC requires pure hydrogen as a fuel and on-board reforming is a realistic way to supply hydrogen. For that purpose fuel processor was developed, but is difficult to apply in real applications due to its relatively long start-up time. Two step Water Gas Shift(WGS) reactors consisting of high and low temperature reactors (HTS and LTS, respectively) mostly delay start-up time. The objective of present study is to develop and apply computational models and to design start-up protocol of WGS reactors. Transient temperature analysis was performed in each reactor with various boundary conditions. The start-up time highly depends on the wall condition and heat supply rate to WGS reactors. The start-up time is decreased with high heat supply rate. The temperature of the HTS reaches to the target very fast with the isothermal wall conditions, but the adiabatic wall condition is better for heating LTS. The optimized start-up protocol is suggested considering the results.
김근수(Keunsoo Kim),안병현(Byunghyun Ahn),이승균(Seungkyun Lee) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
The fuel pump should supply fuel to the engine during the all driving condition but in case of the high power turbo-GDI engine, it usually consumes lots of fuel at the high speed circuit driving condition. At this case of severe circuit driving condition, the fuel pump suction point is separated with fuel in the fuel tank because of excessive lateral acceleration. If the vehicle is driven wide open throttle driving after excessive lateral accelerations. This results in fuel pressure decrease, engine hesitation and stall due to lack of fuel in the fuel pump reservoir.
김근수 ( Keunsoo Kim ),오승묵 ( Seungmook Oh ),김정환 ( Junghwan Kim ),김창업 ( Changup Kim ),이용규 ( Yonggyu Lee ) 한국액체미립화학회 2016 한국액체미립화학회 학술강연회 논문집 Vol.2016 No.-
The ultra-lean combustion is considered to improve fuel economy and reduce harmful exhaust emissions in direct injection spark ignition engine. However, due to its high level of soot emission in lean-burn direct injection combustion, the use of Liquefied Petroleum Gas (LPG) has potential to reduce carbon related emissions and become easily stratified mixture because of its simple structure and its higher vapor pressure respectively. Therefore, the effects of the injection strategies on the combustion and emission characteristics including particle emission of the ultra-lean combustion with LPG were investigated in a prototypal 2,000 cm<sup>3</sup> and 4-cylinder engine. Four injection schemes (L-SI, L-ISI, E-IIS and L-IIS) were utilized to implement the lean-burn LPG combustion under the most frequently used passenger car engine operating point. According to the study, the fully stratified injection strategies indicate about 18% improvement in thermal efficiency; but, the combustion fluctuation was observed due to stratification. Both the NOx and CO emissions were reduced simultaneously compared to homogeneous stoichiometric combustion, but increasing the particulate matter emission was observed.
김근수(Keunsoo Kim),김동현(Donghyun Kim),박정훈(Junghoon Park) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
Petrol vehicles are using canisters that capture evaporative gas to prevent emissions. In case of naturally aspirated engines, there is no problem in inhaling vapor captured in canisters on the in-take side because sufficient negative pressure is formed during engine run, but in case of turbo engines, it is not possible to bring the captured vapor into the canister to the engine because there is no negative pressure formation on the engine in-take. This results in excess canister loading and release of evaporative gas into the atmosphere, which causes fuel odor, causing consumer complaints. In this study, we propose a fundamental improvement direction for reducing fuel odor.