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[論文] 노크이론 확립을 위한 말단가스 온도 및 압력 경과이력
이성열(S. Y. Lee),오영일(Y. E. Oh) 한국자동차공학회 1993 오토저널 Vol.15 No.1
Present-day there are two of theories which have considerable scientific support to explain the knock phenomenon in S.L engine, the detonation theory and the autoignition theory.<br/> But they still have some problems to explain effects of knock parameters, i.e.. compression ratio, spark timing, mixture quality, engine speed. ect, on knocking process in S.L engine.<br/> Accordingly, it is essential to find out whish is more adequate theory of two and to develop the method of analyzing knock phenomenon, that is the aim of this paper. The Authors develop the method of predicting transient temperature and pressure at the end-gas zone during the combustion period and analyze knocking process by this method based on the knock theories.<br/> The caluculated values based on the autoignition theory show reasonab11y correct relations between knock parameters and knock process but there is no evidence of knock occurred by detonation theory through the calculation according to the all parameters.<br/> The authors find out that the autoignition theory is more adequate than detonation theory to analyze knocking process in S.I. engine.
[論文] 다회수 스파크 점화기관의 방전효과에 관한 연구
이성열(S.Y.Lee),한병호(B.H.Han) 한국자동차공학회 1989 오토저널 Vol.11 No.5
The effect of discharge have been investigated for condition of spark in a multiple spark ignition engine, as the spark duration, capacitive and inductive discharge energy were calculated for condition of spark by ignition wave and energy formula,<br/> The useful portion of spark discharge is divided into capacitance portion and inductance portion,<br/> It was found that capacitive discharge energy and spark duration were increased according to increasing number of spark, and inductive discharge energy was increased according to increasing spark intervaL , Therefore engine torque was increased and lean misfire limit was extended comparing with the standard isnition system,<br/> It found that spark energy was discharged within ignition delay period availability acted on the formation and growth of flame kernel, and total spark energy was increased according to increasing number of spark times, but discharged spark energy after ignition delay became unavailable energy, And the capacitive discharge energy has the dominant effect for stoichiomeric or not very rich air-fuel mixture but inductive discharge energy has the dominant effect for lean air-fuel mixture.
[論文] 다회수 스파크 점화기관의 기관성능에 관한 연구
이성열(S.Y.Lee),한병호(B.H.Han) 한국자동차공학회 1988 오토저널 Vol.10 No.4
The ignition quality of ignition system is influenced by spark energy, discharge pattern of spark energy and spark duration.<br/> In this paper, the characteristics of multiple spark ignition system have been investigated for various number of spark and spark interval.<br/> The results, which were compared with those obtained with a standard single spark ignition, show that engine output is increased, and lean misfire limit is extended with the multiple spark ignition system.<br/> The most effective number of spark at the most effective spark interval that are determined by engine performance test, were 6 times spark at 0.20ms spark interval.<br/> For the above condition of spark, engine torque was increased about 20% comparing with conventional ignition system and lean misfire limit was extended to air-fuel ratio 22.5: 1.<br/> This study researched the rate of heat release and quantity of heat release influenced by a condition of spark on the mass burned in order to investigate the relationship between the rate of mass burned and number of spark times.
[論文] 기화혼합장치를 사용한 스파크 점화기관의 기관성능 및 배기성능에 관한 연구
이성열(S. Y. Lee),김성필(S. P. Kim),장종관(J. K. Jang) 한국자동차공학회 1987 오토저널 Vol.9 No.6
The effect of the three types of fuel vaporizing device on the engine torque and exhaust emission was investigated. Among the three types of fuel vaporizing device designed for the experiments, a 88mm long device with mesh around the inside pipe showed stable leam mixture combustion up to 21:1 air-fuel ratio and reduced the exhaustion of CO and HC.<br/> Compared with the general trend in the decrease of engine torque it was observed that the decrease of engine torque in this leam mixture combustion with the new device was small.
서용석(Y. S. Seo),권영직(Y. J. Kwon),이종태(J. T. Lee),이성열(S. Lee) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
This paper is a study on the characteristics of heat dissipation in a turbocharged gasoline engine. in this study, the behavior of cooling loss was investigated with engine speeds in tubocharged<br/> gasoline engine and naturally aspirated gasoline engine. From this results, in order to determine the dissipated heat by cacu lation, experimental formula on overall heat transfer coefficient "'as estalished.