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레이저 굴절법을 이용한 LPG와 가솔린 연료의 화염전파 특성에 관한 연구
이기형,이창식,강건용,강우,Lee, Kihyung,Lee, Changsik,Kang, Kernyong,Kang, Woo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.12
For the purpose of obtaining fundamental data which is needed to develope combustion system of LPG engine, we made constant volume chamber and analyzed flame propagation characteristics under different intial temperature, initial pressure and equivalence ratio which affect combustion of LPG. We investigated flame propagation speed of each fuel using laser deflection method and compared with the investigated flame propagation speed of each fuel using laser deflection method and compared with the results of image processing of flame. As a result, the maximum flame propagation speed was found at equivalence ratio 1.0 and 1.1 for LPG and gasoline, respectively. In the lean region, we can see that flame propagation speed of LPG surpasses that of gasoline. On the contrary, flame propagation speed of gasoline surpasses LPG in the rich region. As initial temperature and initial pressure were higher, flame propagation speed was faster. And, as equivalence ratio was larger and initial temperature was higher, combustion duration was shorter and maximum combustion pressure was higher.
목질계 열분해유/부탄올 혼합연료를 사용한 디젤 발전기의 성능 및 배출가스 특성에 관한 연구
이석환(Seokhwan Lee),강건용(Kernyong Kang),김민재(Minjae Kim),임종한(Jonghan Lim) 한국자동차공학회 2017 한국 자동차공학회논문집 Vol.25 No.3
Wood pyrolysis oil(WPO) has been regarded as an alternative fuel for diesel engines. However, WPO is not feasible for use directly in diesel engines due to its poor fuel quality such as low energy density, high acidity, high viscosity and low cetane number. The most widely used approach to improve WPO fuel quality is to blend WPO with other hydrocarbon fuels that have a higher cetane number. However, WPO and fossil fuels are not usually blended because of their different polarity. Also, clogging and polymerization problems in the fuel supply system can occur when the engine is operated with WPO. Polymerization can be prevented by diluting WPO with other alcohol fuels. However, WPO-alcohol blended fuel does not produce self-ignition. Therefore, additional cetane enhancement to the blended fuel is required to enhance auto-ignitability. In this study, WPO was blended with n-butanol and two cetane enhancements(PEG 400 and 2-EHN) for application to a diesel generator. Experimental results showed that the WPO-butanol blended fuel achieved a very stable engine operation under maximum WPO content of 20 wt%.
11L급 LPLi방식 대형엔진의 흡기스월비 최적화 연구
이진욱(Jinwook Lee),강건용(Kernyong Kang),민경덕(Kyoungdoug Min) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.3
The configuration of intake port is a dominant of inlet air flow and mixture formation in an engine. In this study, as an available technology to optimum intake port, the flow box system using resine has been applied. So we presents a methodology for estimating inlet flow characteristics in this paper. This quantified experimental result shows good agreements with visualization data in a cylinder. We obtained the optimal value of swirl ratio and flow coefficient under steady flow rig test for new development of intake port for heavy-duty engine. From this results, the cylinder head with a good evaluated swirl flow characteristics was developed and adapted for a 11 L heavy-duty engine using the liquid phase LPG injection (LPLi) system, This research expects to clarify major factor that make the intake port efficiently.
엔진연소실에서 아세톤 형광을 이용한 공연비 측정기법 연구
오승묵(Seungmook Oh),강건용(Kernyong Kang),박승재(Seungjae Park),허환일(HwanilHuh) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Planar laser induced fluorescence(PLIF) has been widely used to obtain two dimensional fuel distribution.<br/> Preliminary investigation was performed tomeasure quantitative air excess ratio distribution in an engine fueled with<br/> LPG. It is known that fluorescence signal from acetone as a fluorescent tracer is less sensitive to oxygen quenching<br/> than other dopants. Acetone was excited by KrF excimer laser (248nm) and its fluorescence image was acquired by<br/> ICCD camera with a cut-off filter to suppress Mie scattering from the laser light. For the purpose of quantifying PLIF<br/> signal, an image processing method including the correction of laser sheet beam profile was suggested. Raw images<br/> were divided by each intensity of laser energy and profile of laser sheet beam. Inhomogeneous fluorescence images<br/> scaled with the reference data, which was taken by a calibration process, were converted to air excess ratio<br/> distribution. This investigation showed instantaneous quantitative measurement of planar air excess ratio distribution<br/> for gaseous fuel.
여러 가지 운전조건에 따른 가스연료엔진 오존발생량 연구
김창업(Changup Kim),강건용(Kernyong Kang),배충식(Choongsik Bae) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.6
To analyze the characteristics of ozone formation, measurements of the concentrations of individual exhaust hydrocarbon species have been made under various engine operating parameters in a 2-liter 4-cylinder engine for natural gas and LPG. Tests were performed at constant engine speed, 1800 rpm for two compression ratios of 8.6 and 10.6, with various operating parameters, such as excess air ratio of 1.0~1.6, bmep of250~800 kPa and spark timing of BTDC 10~55°. It was found that the natural gas gave the less ozone formation than LPG in various operating conditions. This was accomplished by reducing the emissions of propylene(C₃<br/> H_6), which has relatively high maximum incremental reactivity factor, and propane(C₃H_8) that originally has large portion of LPG. In addition, the natural gas show lower values in the specific reactivity and brake specific reactivity.<br/> Higher compression ratio of the test engine showed higher non methane HC emissions. However, specific reactivity value decreased since fuel species of HC emissions increase. brake specific reactivity showed almost same values under high bmep, over 500kPa for both fuels. This means that the increase of non methane HC emissions and the decrease of specific reactivity with higher bmep affect each other simultaneously. With advanced spark timing, brake specific reactivity values of LPG were increased while those of natural gas showed almost constant values.<br/>
액상분사방식 LPG 엔진 흡기포트의 실험적 설계 및 최적화
이진욱(Jinwook Lee),강건용(Kernyong Kang),민경덕(Kyoungdoug Min) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
The configuration of intake port is a dominant factor of inlet air flow and mixture formation in an engine. In this study, as an available technology to optimum intake port, the flow box system using resine has been applied. So we presents a methodology for estimating inlet flow characteristics in this paper. This quantified experimental result shows good agreements with visualization data in a cylinder. We obtained the optimal value of swirl ratio and flow coefficient under steady flow rig test for new development of intake plrt for heavy-duty engine. From this results, the cylinder head with a good evaluated swirl flow characteristics was developed and adapted for a 11L heavy-duty engine using the liquid phase LPG injection(LPLI)system. This research expects to clarify major factor that make the intake portefficiently.
오승묵(Seungmook Oh),김창업(Changup Kim),강건용(Kernyong Kang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
The basic effects of hydrogen addition for engine performance and emission were investigated in single cylinder research engine. At the higher excess air ratio(λ=1.7, 2.0), the better combustion stability was found with hydrogen addition even though its effect was small at lower excess air ratio(λ=1.0, 1.3). Stable operation of the engine was even guaranteed at λ=2.0, if the amount of hydrogen gas was near 15% of total energy. In the lean region, λ>1.3, thermal efficiency was improved slightly while it was not clearly observed at λ=1.0, 1.3. It is considered that, in some cases, high temperature environment due to hydrogen combustion caused further heat loss to surroundings. Except for λ=1.0, with larger amount of hydrogen gas addition, CO was reduced drastically but it was emitted more at the leaner region. Nitric oxides(NOx) was increased a little more with hydrogen addition at λ=1.0, 1.3. However, at λ>1.3 its relative amount of emission was low. In addition, the amount of NOx was continuously decreased with hydrogen addition, but, at λ=2.0 the amount of NOx was lowered to 1/300 of that of λ=1.0. THC emission was significantly increased as air/fuel ratio was raised to leaner region due to misfire and partial burn.