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김진영(J.Y.KIm),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha),배충식(C.S.Bae) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Lean burn combustion became an important concept for improving fuel economy and reducing exhaust emissions. However, lean burning is associated with increased cycle-to-cycle combustion variations due to the ignition instabilities and reduced propagation rates. Engine stability under lean mixture conditions could be improved by increasing burning rates through enhanced flow characteristics and by securing ignitability with better ignition systems.<br/> The effects of flow and ignition characteristics on the combustion performances are investigated in a 4-yalve SI engine. Flow characteristics of tumble-swirl were varied with swirl control valve attached at the inlet ports, while ignition energy and its distribution were controlled in a high-frequency ignition system by changing spark duration and spark frequency. The improvement of lean burn performance by the optimum flow and ignition characteristics was discussed.<br/>
혼합기의 유동 및 점화에너지 방전특성이 초기화염의 전파에 미치는 영향
김진영(J.Y.Kim),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Ignition instabilities and reduced flame propagation rates result in the increased cycle-to-cycle combustion variations associated in lean burn.<br/> Combustion stability under lean mixture conditions could be improved by increasing burning rates through enhanced flow characteristics and by securing ignitability with newly developed ignition systems.<br/> Inclined tumble(swirl) flows were induced by three different swirl control valves. The initial flame propagation was visualized by an ICCD camera and its image were analyzed to compare the enflamed area and displacement of intial flames<br/> It was found that there is a correlation between the stronger tumble during induction and comparison and turbulence levels at the time of ignition resulting in faster flame development. Inclined tumble was proved to be more beneficial than the pure tumble for shorter combustion duration and stable combustion under lean mixture conditions, which was confirmed by faster propagation flame image.<br/>
혼합기 유동 특성과 점화에너지 해석을 통한 신점화시스템 설계
김진영(J.Y.Kim),이종숭(J.S.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
The combustion process of spark-ignition engine takes places in a turbulent flow field has been influenced by the flow characteristics of mixture and discharge energy. Experiments were carried out with parameters such as the shape of swirl control valves. discharge pattern and distribution of ignition energy.<br/> This study aims to development of ignition system by analysis of flow characteristics of mixture flow in an engine and ignition energy for enhancement of the ignitability of lean mixture.<br/>
[가솔린엔진부문] CNG 전소엔젠에서의 연소특성에 관한 연구
김진영(J.Y. Kim),이중순(J.S. Lee),정성식(S. S. Chung),하종률(J. Y. Ha) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
In the view of exhaust emission reduction, in order to meet stricter regulation, the efficient supply and use of energy, researches and developments of the alternative fueled engine have been conducted over the world. The necessity of CNG engine development has been also increased domestically.<br/> In the present study, a conventional gasoline engine was modified to a CNG engine, which can be operated with CNG only, and an engine bench test was performed to calibrate the operating parameters of the engine such as air fuel ratio, spark advance and etc. under various operating conditions. Then, the CNG engine installed on engine dynamo-meter was performed to examine the combustion pressure and exhaust emission characteristics.
김진영(J.Y.Kim),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Initial flame development and propagation were visualized under newly developed ignition system to estimate the effects of ignition characteristics on the engine performance in a port injection SI engine. Effects of intake flow was also investigated by three different swirl control valves.<br/> Experiments were performed in an optical single cylinder engine modified from production engine. Flame images were captured through the quartz window mounted in the piston by high speed video camera and its image were analyzed to compare the intial flame area<br/> Results show that IMEP tends to rise slightly as the ignition duration gets longer. The direction of flame propagation is decisively governed by the in-cylinder flow motion. Every flame grows toward the exhaust valve, forming a kind of turbulent flame. The observed flame through the result of visualization is very similar to the result of analyzed from pressure data.<br/>