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루우버휜형 열교환기의 유동구조 및 압력강하 특성에 관한 연구
이교승,전창덕,이진호,Lee, K.S.,Jeon, C.D.,Lee, J. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.2
Experimental studies were performed to determine the characteristics of flow structure and pressure drop in 15 : 1 scale models of multi-louvered fin heat exchanger in a wide range of variables($L_P/F_P=0.5{\sim}1.23$, ${\theta}=27^{\circ}{\sim}37^{\circ}$, $Re_{LP}=50{\sim}2000$). Flow structure inside the louvered fin was analyzed by smoketube method and new correlations on flow efficiency and drag coefficient were suggested. The new definition for flow efficiency, which modifies the existing flow efficiency, can predict the flow efficiency in the range above mentioned and is represented as a function of Reynolds number, louver pitch to fin pitch ratio, louver angle at low Reynolds number. Drag coefficient which is defined here is a function of Reynolds number, louver pitch to fin pitch ratio, louver angle below critical Reynolds number, and can be represented by a function of louver pitch to fin pitch ratio only above the critical Reynolds number.
LPL EGR System 적용 대형 디젤엔진의 EURO-5 NOx 규제대응에 관한 연구
이교승(Kyo Seung Lee),박형배(Hyung Bae Park) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Recently, many small and midium size diesel vehicles are have equipped turbocharger to get high performance and EGR system to reduce NOx emissions but its application to heavy-duty diesel engine is not common yet. In this work, the simulation model for EURO-3 engine was developed using WAVE and then its performance and emission level were verified by comparing with experimental results. The possibility of current EURO-3 engine with LPL EGR system satisfying the EURO-5 regulation would examine. ESC 13 mode was chosen as the primary engine test mode, and the injection timing and fuel quantity were changed to compensate the lost engine performance caused by EGR. The system developed in this study shows that the current EURO-3 engine could satisfy EURO-5 NOx regulation by applying LPL EGR.
이교승(Kyo-Seung Lee),이진호(JINHO Lee),전광민(Kwangmin Chun) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.3
An engine cycle simulation has been carried out to investigate the characteristics of combustion, flow and heat transfer of the 7500cc NA DI diesel engine. The present study overcomes the drawbacks of previous researches and predicts the performance exactly within small error bounds. Prediction of the magnitude and the variation of the mean kinetic energy and the turbulent kinetic energy are also be possible. Heat transfer mechanism can be predicted by employing the modified heat transfer model.<br/> <br/>
유한 요소법을 이용한 직접분사식 디젤엔진 실린더 헤드의 온도 및 열응력분포 해석(Ⅰ)
이교승(K.S.Lee),장경준(K.J.Chang),이진호(Jinho Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
In this study, three dimensional finite element model of a diesel engine cylinder head was made to accomplish heat transfer analysis and also thermal stress and deformation analysis. Heat release analysis and Nusselt-Reynolds relations were applied to determine the convective boundary conditions which is required for heat transfer analysis to calculate temperature distribution. Thermal stress distribution was also investigated in via of heat transfer analysis results. Steady state temperatures and heat fluxes were measured using K-type thermocouples and compared with numerical results to give a guarantee for the plausibility of numerical analyses.<br/>
이교승(K. S. Lee),이진호(Jinho Lee) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.1
A 3-dimensional finite element model was developed for the analysis of the automotive diesel engine piston. The model, which consists of a full piston to accomodate the eccentric bowl in the piston crown, is used to calculate steady state operating temperature, thermal stress and thermal deformation of the piston. Roundness measurement tests, which are new approaches to the analy-sis of piston abrasion and deformation, were done for the comparision of two states of a piston-before and after operation. Numerical prediction shows good agreement with roundness measurement test results.
자동차용 직접분사식 디젤엔진 실린더헤드의 응력분포 측정
이교승(K.S. Lee),홍상욱(S.W. Hong),이진호(Jinho Lee) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
Temperature and stress distribution of a cylinder head which is one of the combustion chamber components are very important factors for the new engine design. In this study, for the purpose of measuring stresses of a cylinder head firing face, high-temperature strain gages are installed around intake and exhaust valves of 2,4-cylinder heads. Stress distribution is measured for various range of engine speeds and engine loads. New experimental method is introduced into the research region where numerical analyses have been the main stream and will present verification data for the propriety of numerical analyses.