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Performance and Emissions of a 11L LPG MPI Engine for City Buses
Kernyong Kang,Changgi Kim,Jinwook Lee,Daeyup Lee 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
A 11L heavy duty LPG MPI engine has been developed using the liquid phase LPG injection system which is one of the next generation LPG fueling technologies, since the LPG MPI engine can achieve higher power and efficiency, and lower exhaust emissions than the conventional mixer type system.<br/> Prototypes - a natural aspiration(NA) engine and a turbocharged inter-cooler(TCI) engine - were developed in this work and tested to measure the performance and emissions. For a NA type engine, in order to achieve the low emissions, the stoichiometric air/fuel ratio was adapted with a three-way catalytic converter. Whereas, for a TCI type, the lean bum technology was introduced to minimize the thermal loading due to increase of the engine power.<br/> The conclusive results demonstrated that the LPG MPI engine has the higher engine performance and lower exhaust emissions than the base diesel engine. Especially, for the NA stoichiometric engine, EURO III regulation for exhaust emissions was successfully met up to 25% of its level.<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.
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.
Application of blended fuel containing coffee ground pyrolysis oil in a diesel generator
Lee, Seokhwan,Choi, Young,Kang, Kernyong Elsevier 2019 Fuel Vol.256 No.-
<P><B>Abstract</B></P> <P>The combustion and emission characteristics of blended fuel composed of coffee ground pyrolysis oil (CGPO), n-butanol and cetane enhancements were investigated in a diesel generator. CGPO, which can be obtained from spent coffee grounds by a fast pyrolysis process, has attracted interest due to its potential application as an alternative fuel. However, CGPO cannot be used in diesel engines directly without causing problems such as clogging the fuel supply equipment and misfiring due to the poor properties of the fuel. Generally, the polymerization of pyrolysis oil could be prevented by diluting it with alcohol fuels. Additionally, CGPO should be enhanced with cetane improver because it does not self-ignite. In this study, CGPO was blended with n-butanol and two cetane improvers.</P> <P>Engine bench test results showed that engine operation was highly stable using blended fuel. Although the carbon monoxide (CO) and nitrogen oxides (NOx) emissions of the blended fuels were larger than those of diesel, the hydrocarbon (HC) and particulate matter (PM) emissions decreased due to the high oxygen content of n-butanol and CGPO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigated the possibility of direct use of coffee ground pyrolysis oil in a diesel engine. </LI> <LI> The auto-ignition properties of the blended fuels can be enhanced by two cetane improvers. </LI> <LI> The efficiency of the blended fuels was slightly higher than that of diesel. </LI> <LI> The PM emissions from blended fuels were significantly reduced. </LI> </UL> </P>