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가솔린 직분식 엔진의 연소실 개발을 위한 분무 및 유동장 해석
최규훈(K. H. Choi),박종호(J. H. Park),이내현(N. H. Lee) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.6
For development of SDI<Spark-ignited Direct Injection) engine, stratified mixture formation with adequate strength at spark plug was required in wide range of engine operating con-ditions. So, spray structure under high ambient pressure and spray distribution after impingeon piston bowl in motoring engine was visualized by using laser equipments. Also, in-cylinder bulk flow structure was measured by using PIV (Particle Image Velocimetry) system. Counter-rotating tumble port and bowl piston was found effective to conserve bulk motion directed to spark plug in compression stroke. In addition, mask attached near valve seat in intake port was proposed to attenuate conventional tumble component and enhance counter-rotating tumble component.<br/>
희박연소엔진用 SCV形 포트의 흡입유동특성에 관한 전산수치해법적 연구
김구경(K.K. Kim),김현권(H.K. Kim),최규훈(K.H. Choi),이경헌(K.H. Lee),허남건(N.K. Huh) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
The steady state in-cylinder flow analysis of lean-burn engine with swirl control valve(SCV) is performed. The 3D CAD(CATIA) surface data of a developing engine is used in a computational fluid dynamics analysis, which could give design guidelines for geometries of intaKe port and SCV. The results of computational analysis shows that the CFD code could be used in a quantative and/or qualitative availability study of intaKe system.<br/>
신민규(M. K. Shin),박종호(J. H. Park),유철호(C. H. Yu),이내현(N. H. Lee),최규훈(K. H. Choi) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.5
Nowadays, gasoline direct injection engines are being commercialized by virtue of improvement in control technology of spray, flow, air fuel ratio. The stratified charge type has the advantage of improving lean limit. The homogeneous type has the advantage of reducing engine-out hydrocarbon emissions in the first 30 seconds after a cold start, in addition, improving transient air fuel ratio control.<br/> The vaporization and mixing of injected fuel with air has to be completed in a short time and the fuel film in cylinder and on piston has to be minimized. So, the flow and injection should be well controlled. This paper surveyed the spray characteristics of gasoline direct injection by using laser equipment and the combustion characteristics of the single cylinder engine using homogeneousas-mixture type gasoline direct injection.<br/>
CFD를 이용한 직접 분사식 가솔린 엔진의 실린더 내부 유동 해석
김명환(M.H.Kim),박종호(J.H.Park),이내현(N.H.Lee),김현권(H.K.Kim),최규훈(K.H.Choi) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Some considerations of Computational Fluid Dynamics(CFD) technology were studied for calculating of steady and unsteady in-cylinder flow fields. And the changes of flow field according to variations of configuration of intake port generating reverse tumble and curved piston to control purposed bulk flow were calculated. Also, CFD results were compared to experimental results using LDV, PIV and good validations were met. As a result, reverse tumble flow generated during intake process was preserved by configuration of curved piston while base and reverse tumbles were diminished at the end of compression stroke in case of flat top piston. In addition, it will be needed to optimize the fuel mixture distribution based on these results.<br/>
이충훈(C. H. Lee),최규훈(K. H. Choi),노석홍(S. H. Noh),정석호(S. H. Chung) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.3
Spray characteristics of high pressure injectors for diesel engines have been experimentally stud-ied with special emphasis on the effect of swirl. A constant volume chamber was rotated in order to generate a continuous swirl having the flow field of a solid body rotation, resulting in the linear dependance of the swirl number on the rotating speed of the chamber. Emulsified fuel is injected into the chamber and the developing process of fuel sprays is visualized. The fuel spray developing process in D. 1. diesel engine was investigated by this liquid injection technique. The effect of swirl on the spray tip penetration is quantified through modelling. Results show that the spray tip penetration is qualitatively different for low and high pressure injections. For high pressure injection case, a good agreement is achieved between the experimental results and the modeling accounting the effect of swirl. For low pressure injection, a reasonable agreement is obtained. It is found that excessive swirl may cause adverse effect on spray dispersion during the initial combustion period since the spray can not be impinged on chamber wall.
이내현(N.H.Lee),박종호(J.S.Park),유철호(C.H.You),이주헌(J.H.Lee),최규훈(K.H.Choi) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
To meet requirements for low emission and improved fuel economy gasoline engines, Kia is carrying out the measurements and analysis of intermal phenomena in combustion chamber of gasoline engines, especially including a Spark Ignited Direct Injection engine. We introduce several research activities such as the study on air motion, spray impingement and flame propagation using PIV, LDV and ICCD equipments with a visualized single cylinder engine.<br/>
이충훈(C.H.Lee),최규훈(K.H.Choi),노석홍(S.H.Noh),정석호(S.H.Chung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
A constant volume chamber which cotains water was rotated in order to simulate solid body rotating swirl in direct injection diesel engines. The swirl number of the chamber linearly depends on the rotating speed of the chamber. Emulsified fuel was injected into water. which simulate high fuel injection into a high pressure gaseous contant volume chamber. Visualization of the fuel spray developing process in D.I. diesel engine was investigated by this liquid injection technique. The effect swirl number on the spray tip penetration and break-up lenth was investigated by experiment and modelling. Dispersion characteristics of fuel spray was also investigated according to the swirl number.<br/> <br/>
가솔린 직분식 엔진의 연소실 개발을 위한 분무 및 유동장 해석
박종호(J.H.Park),신민규(M.K.Shin),이내현(N.H.Lee),최규훈(K.H.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
For development of SDI(Spark-ignited Direct Injection) engine, stratified mixture formation with adequate strength at spark plug was required in wide range of engine operating conditions. So, spray structure under high ambient pressure and spray distribution after impingement on piston bowl in motoring engine was visualized by using laser equipment. Also, in-cylinder bulk flow structure was measured by using PIV(Particle Image Velocimetry) system. Counter-rotating tumble port and bowl piston was found effective to conserve bulk motion directed to spark plug in compression. In addition, mask assached near valve seat in intake port was proposed to attenuate conventional tumble component and enhance counter-rotating tumble component.<br/>
저압축 고팽창비 가솔린 기관용 수퍼차저의 과급 특성에 관한 연구
이창식(C.S.Lee),이기형(K.H.Lee),전문수(M.S.Chon),김영호(Y.H.Kim),김대식(D.S.Kim),최규훈(K.H.Choi),노석홍(S.H.Noh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
This work deals with the performance characteristics of three lobe Roots type supercharger for the application of low compression and high expansion ratio gasoline engine. The performance test was conducted to obtain the drive power, volumetric efficiency, adiabatic efficiency, and the influence performance factors of supercharger. In order to obtain the supercharging characteristics of engine, the effect of operating conditions on the supercharging performance of low compression and high expansion ratio gasoline engine was investigated. The results show that the increase of supercharger speed and pressure ratio bring about the increase of drive power. The three lobe Roots type supercharger which was applied for this study is considered operating properly at the compression ratio less than 1.3 for the low revolution^ 5.000rpm)'. for the higher revolution, compression ratio high then 1.5 is recommended.<br/>