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오병진(B. J. OH),박정서(J. S. Park),손경효(K. H. Son),김문헌(M. H. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
The investigation regarding the ignition mechanism of a plasma jet was explored by using a constant volume vessel. The purpose of this is to elucidate relation between the characteristics of jet ejection and the configuration of plasma jet plug, when sub energy were supplied at plasma jet ignition system. From the result of the visualization, the jet ejection by plasma jet ignition system are depended on the configuration of jet plug, sub energy. As sub energy and orifice diameter are increased the jet ejection length is increased, and also the pressure rise. In particular, according to decreasing of jet plug volume, jet ejection length is increased. It shows that the plasma jet ignition system is more fast burn than conventional spark ignition system.<br/>
오병진(B.J.Oh),박정서(J.S.Park),김문헌(M.H.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The investigation regrading the ignition mechanism of a plasma jet was explored by using a flat type combustion volume vessel. The purpose of it is to elucidate the impingement eppect of plasma jet ejection to constant volume vessel wall. By means of visualization. it is demonstrated that the characteristics of single. double. and triple hole plasma jet plug. and conventional spark plug in flat type constant volume vessel. And it was executed in laminar flow field at LPG-air pre-mixture.<br/> From a result of the wall impingement effect by plasma jet ejection. multi hole plasma jet ejection is desiable to formed flame kernel independently and does not interrupt with flame boundary surface each other. And each plasma jet ejection dose not contact with chamber wall during early combustion process. <br/> For compared with combustion phenomena for combustion index. double hole 45˚ plasma jet ignition is more effects of the enhancement of combustion.<br/>
플라즈마 제트 플러그 형상변화에 대한 LPG-공기혼합기의 연소특성
오병진(B.J.OH),박정서(J.S.PARK),김문헌(M.H.KIM) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Experimental investigation of the effects of combustion various plasma jet shapes on LPG-air mixture was executed in laminar flow field. By visualized for early flame kernel for single, 2 hole plasma jet and central, conventional side ignition on various sub-energy, compared each combustion phenomena. Early flame kernel formation is increase by the increasing of sub-energy and 2 hole plasma jet ignition is the largest flame kernel formation at 0.4ms after discharged.<br/> For compared with combustion phenomena for combustion index, single plasma jet ignition is more effects of the enhancement of combustion.<br/>
박정서(J.S.Park),오병진(B.J.OH),김문헌(M.H.Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
The investigation regarding the ignition mechanism of a plasma jet ignition was explored by using a constant volume vessel. The purpose of this study is to elucidate relation between the characteristics of plasma jet proftles (length and width) and the configuration of plasma jet plug, when sub energy were supplied.<br/> From the result of the visualization, the plasma jet profiles are dependent of the configuration of plasma jet plug shape, sub-energy, surrounding pressure. As increasing of sub-energy and electrode diameter at constant surrounding pressure, plasma jet length is increased. And also increasing of surrounding pressure and cavity depth at constant sub-energy, plasma jet length is increased.<br/> It is important design factors of which cavity depth, orifice and electrode diameter and sub-energy in order to optimum design of plasma jet profiles.<br/>
홍재웅(J.W.HONG),송영식(Y.S.SONG),오병진(B.J.OH),김문헌(M.H.KIM),이종태(J.T.LEE) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to find method to form strong turbulence at end of compression stroke in engine, RlCEM(Rapid Intake Compression Expansion Machine) has been developed. it is able to measure descriminately turbulence flow during intake or compression stroke. And then turbulence flow was measured by using a Hot wire anemometer. The results are as follows. Turbulence by inertia effect is a major portion during early intake stroke. But the turbulence by inertia effect is less than that by inlet pressure during compression stroke, because of abrupt dissipation after formation. The turbulence formed by piston compression is insignificant during compression stroke.<br/>
터보과급 디젤기관의 부하 급변경시 압축공기 공급에 의한 매연저감효과
엄기흥(EUM K.H),오병진(OH B.J),김문헌(KIM M.H),이종태(LEE J.T) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
During the rapid load variation for turbocharged diesel engine, smoke concentration increased rapidly for run low of air amount because of turbo lag. For reduction of smoke concentration in case of rapidly accelerating of turbocharged diesel engine. it was manufactured intake manifold pressure compensation and time controlled compression air supplied equipment.<br/> A comparion of the smoke reduction effects for compression air supplied pressure, air supplied time and smoke concentration according to time progress was presented for each engine speed.<br/>
직접분사식 디젤 연소실 벽면에서의 열유속에 미치는 메탄올 혼입의 영향
김영호(Y.H. Kim),오병진(B.J.Oh),방정서(J.S. Park),기학영(H.Y.Kim),김문헌(M.H.Kim),이종태(J.T.Lee) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effect of methanol fumigation on heat flux in combustion chamber wall of direct injection diesel engine have been investigated. The instantaneous surface temperature and heat flux of combustion chamber wall are decreased according to<br/> increase methanol fumigation. Maximum heat flux at methanol<br/> volume ratio 30% decrease 2.3 MW /㎡ and maximum heat flux reduction rate decrease 39% than that of diesel engine.<br/>