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EGR 성층화급기에 의한 DME HCCI 연소시의 압력 상승률 저감에 관한 연구
임옥택 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.6
Stratified charge has been thought as one of the ways to avoid a sharp pressure rise on HCCI combustion. The purpose of this study is to evaluate the potential of stratified charge for reducing PRR on HCCI combustion. The pre-mixture with thermal, mixing and EGR stratifications is charged in Rapid Compression Machine. After that, the pre-mixture is compressed and in that process, in-cylinder gas pressure and temperature are analyzed. Additionally numerical calculation with multi-zones modeling is run to know the potential of stratified charge for reducing PRR.
유정에서 선체까지 선박의 액화천연가스 및 해양 연료의 비교 수명주기 평가
임옥택,윤상진 한국수소및신에너지학회 2021 한국수소 및 신에너지학회논문집 Vol.32 No.2
In this study, well to hull was obtained by life cycle assessment (LCA) and the greenhouse gases, regulated emissions, and energy use in transportation model (GREET), which is developed by Argonne National Laboratory to evaluate the environmental impact of marine liquified natural gas (LNG) and marine fuel. This study compared the environmental impact of marine LNG and marine fuels, which were caused by green house gases (GHG) emissions and energy consumption. The effect resulted from well to pump (WTP) process and pump to hull (PTH). Natural gas has the potential to generate more greenhouse gases than liquid fuels due to the amounts of leaks of the gas that were sent out the air during production and processing. Nevertheless, the results showed that the greenhouse gases produced during transportation were enough to reduce the disadvantages of PTH process. The research expects that the results will be in accordance with the environmental policy of South Korea.
INVESTIGATION OF THERMAL STRATIFICATION EFFECT ON N-HEPTANE/ISO-OCTANE-AIR MIXTURE HCCI COMBUSTION
임옥택 한국자동차공학회 2013 International journal of automotive technology Vol.14 No.6
The HCCI combustion mode poses its own set of narrow engine operating by knocking. In order to solve this,inhomogeneity method of mixture and temperature is suggested. The purpose of this research is to get fundamental knowledge about the effect of thermal stratification on HCCI combustion of n-Heptane/iso-Octane-Air mixture. The temperature stratification is made by buoyancy effect in combustion chamber of RCM. The analysis items are pressure, temperature of incylinder gas and combustion duration. In addition, the structure of flames using the two dimensional chemiluminescence's images by a framing camera are analyzed. Under stratification, the LTR starting time and the HTR starting time are advanced than that of homogeneous. Further, the LTR period of homogeneous conditions became shorter than that of the stratified conditions. With the case of homogeneous condition, the luminosity duration becomes shorter than the case of stratified condition. Additionally, under stratified condition, the brightest luminosity intensity is delayed longer than at homogeneous condition.
예혼합 기의 초기 온도 및 초기압력이 HCCI엔진연소에 미치는 영향에 관한 수치해석연구
임옥택(Ocktaek LIM),윤상진(Sangjin Yoon) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.4
In HCCI combustion, sometimes there are two stage heat release; low temperature heat release (LTHR) and high temperature heat release (HTHR). Some experimental results clearly show pressure also is very important in determining whether we get LTHR or not. For instance, we found that if we run the engine with boosted intake pressure and low temperature, we could see LTHR but LTHR disappears if the same fuel is run with low intake pressure and high intake temperature. Thus whether you see LTHR in HCCI tests depends very much on the operating conditions. The purpose of this study is to evaluate the elementary reaction path affected by an initial Pressure and Temperature. The influence of the fuels between high octane number and low octane number fuels are also considered. For this reason, n-Heptane (PRF0) that has large heat release in LTHR and iso-Ocatne (PRF100) that has small heat release in LTHR were used as test fuels. The method of calculate the contribution of each elementary reactions and chemical species are also considered.
소형촉매를 이용한 자동차용 배기정화 촉매의 열화특성 연구
임옥택(O.T.Lim),위장현(J.H.Wee),임명택(M.T.Lim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
Down-sized catalytic converters are used to reduce the time and expenses involved in fast aging tests of the automotive catalysts. Small converters are connected to each branches of a manifold. in which flow engine exhaust of different equivalence ratio and temperature. The equivalence ratio and temperature of the feed gas are individually adjusted by applying different levels of insulation and Quantities of secondary air. A Pd-only catalytic converters are fast aged for 50 hours by lean exhaust gas at the temperatures above l,000˚C, and the conversion efficiencies during the process are measured and analyzed. The catalytic converters deteriorate little faster at higher temperature and by leaner exhaust gas. The Pd catalyst seems to be much more durable to aging than Pt/Rh catalyst test earlier.
DME/Diesel 듀얼 퓨얼 엔진의 연소 및 배출 특성에 관한 연구
임옥택(Ocktaeck Lim),표영덕(Youngduck Pyo),이영재(Youngjae Lee) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.5
This study investigates the potential of DME/Diesel dual fuel engine for reducing emissions with same power. Dual fuel engine controls the combustion using two different fuels, DME and diesel with different auto-ignition timings. In the previous work, the caracteristics of combustion and emissions under single cylinder engine and ignition is done by compression ignition. Pre-mixture is formed by injecting low-pressure DME into an intake manifold and high-pressure fuel (diesel or DME) is injected directly into the cylinder. Both direct diesel injection and port fuel injection reduced the significant amount of Smoke, CO and NOx in the homogeneous charge compression ignition engine due to present of oxygen in DME. In addition, when injecting DME directly in cylinder with port DME injection, there is no changes in emissions and energy consumption rate even operated by homogeneous charge compression ignition.