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동적모사장치를 이용한 2-행정기관의 소기효율 정량화 연구
황정성(J.S.Hwang),이진욱(J.W.Lee),강건용(K.Y.Kang),정용일(Y.I.Jeong),이상수(S.S.Lee),성낙원(N.W.Sung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
Two-stroke engine has advantages over four-stroke engine of greater torque and power, less torque fluctuation and more compactness. At the same time. it has main drawback of the short circuiting flow and excessive oil consumption. In these days, however, the oil consumption problem has been solved by adapting poppet valve system instead of port type. For the mid step of this research. in order to ultimately optimize scavenging process using RSSV(rotatable shrouded scavenging valve) system, which has been patented by our research group, the experiment of scavenging efficiency evaluation is performed by using dynamic simulator. The experimental results match up to the former results of flow visualization and steady simulator. Keywords' Two-Stroke Engine, Scavenging Process. RSSV, Dynamic Simulator.<br/>
[디젤엔진부문] 디젤엔진 적용 플라즈마반응기의 내부유동 특성해석
이진욱(J.W.Lee),정용일(Y.I.Jeong),장창익(C.I.Chang) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
In order to reduce NOx and Particulate matter(Pl\1) emitted from diesel engine, many researches are being performed. This paper will discuss the results of an extensive series of experiments aimed towards understanding the effect of exhaust flow condition in plasma reactor and outline how exhaust flow control in plasma reactor affects particulate emissions during D-13 mode test of engine experiment. Parameter characteristic analysis in plasma reactor system was carried out in a heavy duty diesel engine which emit much particulate matter. From this study, we found that the configurations between the exhaust pipe
설계하중 및 통과톤수를 고려한 유도상 아스팔트 궤도의 내구수명 예측
이성혁(S.H. Lee),이진욱(J.W. Lee),이현민(H.M. Lee) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
유도상 아스팔트 궤도는 강화노반 상부에 부설된 아스팔트 콘크리트 층의 열차하중 분산효과에 의해 강화노반 두께를 감소시킬 수 있으며, 빗물 침투방지로 인한 노반부의 강도저하와 연약화 방지 효과, 노반 분니 방지 및 동상방지 등 다양한 장점을 가지고 있다. 이러한 장점으로 유도상 아스팔트 궤도는 미국을 비롯한 유럽 및 일본 등에서 널리 사용되고 있으며 국내에서도 도입을 위한 연구가 진행 중이다. 본 논문은 유도상 아스팔트 궤도의 적용성을 평가하기 위한 기초 연구로서 누적통과톤수를 주요 변수로 하여 아스팔트 콘크리트층의 존재에 의한 강화노반 두께 저감 가능성과 설계수명에 미치는 영향을 검토하였다. Reducing the thickness of reinforced roadbed is possible for ballasted asphalt track, due to the train-load distribution effect of asphalt concrete layer constructed on the top of reinforced roadbed. Including the advantages against mud pumping and heaving, the ballasted asphalt track also have the great merits in preventing the strength reduction of roadbed and its softening by prohibiting raindrop penetration. The virtues have made its widespread adoption in many countries in Europe as well as the USA and Japan. Research on introducing the ballasted asphalt track is on-going presently in Korea to put it into practice. This paper, as a basic research to evaluate the applicability of the ballasted asphalt track, examined the possibility of reducing the thickness of reinforced roadbed under the asphalt concrete layer and its design life, with main variables being accumulated passing tonnage.
[디젤엔진부문] 디젤엔진의 흡기시스템내 접선형포트형상이 스월유동에 미치는 영향
이준열(J.Y.Lee),이진욱(J.W.Lee),강건용(K.Y.Kang) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study involves several measurement techniques to analyze swirl flow in a four-valve HSDI 2.0L diesel engine; swirl meter measurements and LDV measurements. Flow characteristics of a four-valve cylinder head were examined in a steady test rig for different SCV angles (0, 30, 90) to quantity swirl ratio. Then the measurement of swirl mean velocity and turbulence intensity have been made for motoring condition(500, 800rpm) using a laser Doppler velocimetry system which was applied in backward scattering method from top-view and bottom-view. This study also analysed some parameters of swirl ratio, swirl averaging velocity. Obtained results about the optimal intake port configuration are expected to be a suitable guide line in the analysis of the swirl flow characteristics.
이진욱(J.W.Lee),강건용(K.Y.Kang),박승주(S.Z.Park),박정규(J.K.Park) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
The pent-roof geometry of the cylinder head in a four-valve engine has been known to be favorable to the tumbling motion. The formation of a tumbling vortex is an effective way to enhance pre-ignition turbulence and it eventually promotes faster burning rates. This study presents experimental results of the tumble flow structure, including the flow motion phenomena, tumble mean velocity, angular momentum and turbulence intensity. Two four-valve cylinder heads were selected for changing tumble flow intensity and the tumble velocity was obtained under motoring conditions (at 1000rpm) by LDV measurement<br/>
4-밸브엔진의 실린더내 경사텀블을 이용한 난류증가 특성
이진욱(J.W.Lee),강건용(K.Y.Kang),조규백(G.B.Cho),최승환(S.H.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The inclined-tumble flow measurement and analysis were performed for various types of intake systems that generated several different combinations of swirl ratio and tumble ratio in the cylinder. The in-cylinder motion is varied by means of flow control unit located between the intake manifold and the cylinder head. This study was conducted on an optically accessed transparent single cylinder research engine. The swirl/tumble ratio and angular speed of the tumble and swirl vortices, occuring inside the cylinder, are determined from a conventional steady flow rig and Laser Doppler Velocimetry under motoring conditions (at 1000rpm). The influence of swirl/tumble levels on the characteristics of turbulence was analysed. This study presents experimental results of the inclined-tumble flow structure, including the flow motion phenomena, swirl center rotation, angular momentum and turbulence intensity.<br/>
포핏밸브형 2-행정엔진의 RSSV 형상별 소기특성 연구
이진욱(J.W.Lee),강건용(K.Y.Kang),정용일(Y.I.Jeong),이주현(J.H.Lee) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
Two stroke engine has completely met the requirements of users in the field of light motorcycles, motor scooters, since it has advantage of simplicity, lightness and ease of maintenance. However the most serious draw-back of the conventional two stroke engine has considered as high fuel consumption due to scavenging losses of fresh fuel-air mixture. This paper deals with an investigation of the scavenging performance of the poppet-valve type two-stroke engine. By changing the shape of shrouds which is setted on the intake valve, the scavenging flow characteristics are investigated by flow visualization under steady condition.<br/>
아스팔트 및 강화노반의 두께 변화에 따른 아스팔트 직결궤도의 내구수명 평가 기초연구
이현민(H.M. Lee),이성혁(S.H. Lee),이진욱(J.W. Lee),조용성(Y.S. Cho) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
아스팔트 직결궤도는 평탄성 확보가 쉽고 별도의 충전층이 없이 신속한 시공이 가능하다. 또한 선로유실과 지반침하 등의 문제 발생 시 신속히 유지보수 할 수 있는 장점이 있다. 독일의 경우 베를린-하노버 구간의 아스팔트 직결궤도(ATD궤도)는 부설 이후 20년간 유지보수가 불필요하고 우수한 소음저감효과가 있는 것으로 보고하고 있다. 아스팔트 직결궤도는 열차하중이 침목 또는 패널로부터 아스팔트 노반에 직접 전달되는 구조로서 아스팔트 콘크리트 층의 두께 변화에 따라 상부노반에 작용하는 응력 및 아스팔트 노반 하부 변형률이 내구수명에 큰 영향을 미칠 것으로 예상된다. 따라서 본 논문에서는 현재 개발되어 있는 아스팔트 직결궤도용 광폭 침목을 이용하여 아스팔트노반 및 강화노반의 두께 변화가 강화노반에 미치는 영향을 분석하고 목표 설계수명을 평가하고자 하였다. Directly fastened asphalt track is easy to secure flatness and possible to construct quickly without any special filler layer. It also has an advantage of maintaining and repairing immediately in case of track loss or settlement. Directly fastened asphalt track (ATD track) between Berlin and Hanover in Germany is reported that its maintenance has been unnecessary for 20 years after construction. The track is also noted for its excellence of noise reduction. Directly fastened asphalt track transfers train load directly to asphalt roadbed through sleepers or panels. According to the thickness of asphalt concrete layer, therefore, the stress acting on upper roadbed and the strain of lower asphalt roadbed are expected to have a big effect on its design life. In this respect, this paper focused on the effect of the asphalt and reinforced roadbed layer thickness on reinforced roadbed and the evaluation of its service life using currently available wider sleepers for directly fastened asphalt track.