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분위기 조건이 직접분사식 인젝터의 미립화에 미치는 영향
이중순,Lee, J.S. 한국액체미립화학회 2001 한국액체미립화학회지 Vol.6 No.1
Several efforts to meet the exhaust gas regulation have been undertaken by many researchers in recent years. Main researches are on development of design techniques of intake port and combustion chamber, atomisation of fuel and precise control of air-fuel ratio, post-treatment of exhaust gas and so on. Engine technology is changed from PFI to GDI to correspond with exhaust gas regulation. GDI technique makes it possible to preserve lean air-fuel ratio and control accurate air-fuel ratio. Nevertheless, It is not cleared that information of spray characteristics and atomization process are very dependent on fluctuation of pressure and change of temperature in intake stroke. In this study, a constant volume combustion chamber is manufactured to investigate various fluctuations of in-cylinder pressure for injection duration. It is taken photographs of injection process of conventional GDI injector using PMAS. Then, it was verified experimently that ambient conditions as temperature and pressure of combustion chamber have effects on process of spray growth and atomization of fuel.
이종숭(J.S.Lee),김진영(J.Y.Kim),이상무(S.M.Lee),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
It is a necessary condition to control the precise air-fuel ratio with real time for the stability of lean burn including transient operating condition as well as other factors as flow of mixture and ignition energy in SI engine.<br/> This study aims to development of software and hardware such as the engine control system and interface. Real time control system is introduced and its characteristics are tested in SI engine. The real time control system was applied to SI engine and the results are shown.<br/>
점화에너지 특성이 예혼합기의 착화와 연소에 미치는 영향(2)
이중순(J. S. Lee),강병무(B. M. Kang),정성식(S. S. Chung),하종률(J. Y. Ha) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
In order to develop a new concept of ignition system, we observed the characteristics obtained from the ignition and combustion experiments where each of two kinds of ignition devices were introduced into the visualized engine and a constant volume combustion chamber with sub-chamber. The conclusion from the observation can be summarized as follows: 1) The ignitability limit for HIS expands wider and the combustion is more stable than for CDI 2) The combustion duration and ignition timing depends upon the distribution of local mixture density in the vicinity of ignition spark plug.<br/>
이중순(J.S.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In the SI engine, the improvement of combustion stability is important not only for the fuel consumption rate but also for the emission control at idling of engine. Thus the engine speed fluctuation at idle operation mainly comes from cyclic variation of combustion in the SI engine. In this syudy. the improvement of combustion stability for the SI engine at idle condition by the cooling water temperature, duty ratio of ISC. spark ignition timing as well as the reducement of the harmful exhaust gas emission was discussed.<br/>
이중순 ( J. S. Lee ) 한국액체미립화학회 2000 한국액체미립화학회지 Vol.5 No.1
Recently the laser sheet technique has been developed to improve our limited understanding of the in-cylinder diesel combustion. The technique is capable of high temporal and spatial resolution, so that it is proved to be an adequate combustion diagnostics to find out exhaust emission formation. The optical signals of LIS(Laser Induced Scattering) and LII(Laser Induced Incandescence) images show informations for soot concentration within the optically accessible diesel engine. The LIS and LII signal images of soot concentration provide new insight into where and when soot occurs in a diesel engine.