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디젤 파일럿 압축착화 천연가스엔진의 성능 및 배출가스 특성
이준혁(Junhyuk Lee),표영덕(Youngdug Pyo),권오석(Ohseuk Kwon),이용균(Yonggyun Lee),나평철(Pyungchul Na),류정인(Jeongin Ryu),이영재(Youngjae Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Natural gas has superior characteristics that are low fuel efficiency, low CO₂, low pollution and stabilization. And it is possible to apply to existing diesel engine with some mechanical modification. Diesel pilot compression ignition CNG engine has advantage of power and efficiency as same as diesel engine without high cost of remodeling and it can use advantage of high compression ratio of diesel engine and has low Smoke and NOx. In the present study, an existing diesel engine was remodeled into single cylinder Diesel pilot CNG engine has two fuel suppling system, one is diesel pilot injection in cylinder using existing Electronic Unit Injector(EUI), the other is the way that injected CNG into a intake manifold using instituted supply apparatus. The test results showed that diesel pilot injection timing was decided 13°BTCD and diesel pilot injection fuel flow was decided 0.19 L/h. At that condition, Smoke and CO were reduced and NOx was slightly increased than using diesel fuel.
수소 연소 리니어 동력/발전 시스템의 부하에 따른 연소 특성
하동흔(Dongheun Ha),이준혁(Junhyuk Lee),정익재(Ikjea Chung),강현석(Hyunsuk Kang),이길용(Kilyong Lee),나평철(Pyungchul Na),이용균(Yonggyun Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Hydrogen fueled linear power/generation system is higher efficiency then the crank engine. This system will applied possible the undersized Co-generation and hybrid car etc. In this paper, we performed a com Hydrogen fueled linear power/generation system is higher efficiency then the crank engine. Combustion test by adjusting load of hydrogen combustion linear power/generation system, based on test results we identified the characteristics of the system. As the results, frequency has close interrelation with mover's weight, operating frequency approximates in ideal frequency, confirmed that efficiency rises in hydrogen combustion linear power/generation system.
유철호(Chulho Yu),최종혁(Jonghyeok Choi),이용균(Yonggyun Yi),이내현(Naehyun Lee),노석홍(Seokhong NOh),최규훈(Kyuhoon Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The automobile industry has devoted considerable effort to increasing the thermal efficiency of gasoline engines. Extensive research and development efforts have been concentrated on establishing the combustion concept of Spark-ignited direct injection engine for the past fifty years.<br/> Recently, both growing attention towards energy saving and rapid progress in micro-computers and sensor technologies have aroused the intereets in SDI systems.<br/> In this paper, a newly developing KIA SDI engine is introduced. This SDI engine solved the problems in the past SDI engine with new technologies such as tumble port, piston with spherical cavity, high pressure fuel injection system. Further description is given about combustion characteristics, tuel economy and exhaust emission performance.<br/>
Reverse uniflow 소기방식의 수소 리니어 엔진의 연료분사 최적화
조종표(Chong Pyo Cho),이영재(Youngjae Lee),우영민(Youngmin Woo),이용균(Yonggyun Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper focuses on the numerical analysis to optimize Hydrogen fuel injection timing for a two-stroke, free-piston spark ignited engine employing reverse uniflow scavenging and intake valve. The free piston engine system consists of a block with a double-end cylinder and one intake valve at each end. Appling the valve which operates in 12㎳ for positioning 6㎜ in stroke, this paper presents the characteristics of the flow fields in engine cylinder including intake valve. It was investigated that the fuel mass transfer was strongly affected by the initial in-cylinder flow pattern.
주태헌(Taeheun Joo),표영덕(Youngdug Pyo),오시덕(Sidoek Oh),이용균(Yonggyun Lee),이영재(Youngjae Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
CHP (combined heat & power generation) system produces heat and electricity simultaneously in one process with high efficiency. Also, carbon dioxide emissions can be reduced as well. In the present, micro scale CHP systems under tens kWs are applied in small buildings. However, there have been few models in this class of CHP system. In the present study, a gas engine with nominal output of 15 kilowatts at 1,800rpm was developed from conventional agricultural diesel engine and optimized for micro CHP package. To increase the engine thermal efficiency, miller cycle was adapted by modification of earn shaft profile, and enhanced swirl was also introduced by modifying the intake gasket geometry. The gas engine shows 33.94% of thermal efficiency and Jess than 10 ppm of NOx emission at 13% Oxygen condition under stoichiometric combustion, and 35.52% of thermal efficiency and about 130 ppm of NOx emissions at 13% oxygen conditions under lean combustion.
노태석(Taeseok Noh),김강출(Kangchul Kim),우영민(Youngmin Woo),이용균(Yonggyun Lee),류정인(Jungin Ryu),이영재(Youngjae Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Linear engines give power output more efficiently compared to conventional reciprocating piston engine, because it doesn't have a crank mechanism, hence there is less mechanical loss. In addition, if hydrogen fuel is used in a linear engine, it would be possible to make exhaust emission level almost zero without sacrificing the efficiency. In this study, a prototype linear engine was developed and a hydraulic starting system was adopted to give it a motion. It was possible to operate the engine at a velocity of 17㎐. The linear engine was found to give various positions of piston at TDC and different combustion characteristics at each fire. This irregular moving characteristics is mainly caused by the degree of freedom of the piston without crank mechanism in the linear engine and resultantly the subsequent combustion was affected significantly. In extreme cases, abnormal combustion or misfire brought out and this made the engine stop because there is no mechanism to save the inertia energy in the linear engine.