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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/>
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/>
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/>
[가솔린엔진부문] 상용기관 연소실 형상을 갖는 정적 연소기에서의 플라즈마 제트 점화에 의한 연소특성
류현욱(H.W.Ryu),박정서(J.S.Park),유호선(H.S.Yoo),김문헌(M.H.Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
In this paper. combustion characteristics ignited by single-hole and multi-hole plasm jet igniter and conventional spark plug have been studied by means of schlieren photography and pressure measuring in the Pent-roof type and the Toroidal bowl type constant volume vessel which is typical 4-valve 51 engine combustion chamber. It is represented that combustion characteristics ignited by conventional spark plug ignition are hardly influenced by configurations of combustion chamber. In contrast. in case of plasma jet ignition, combustion duration and combustion enhancement rates are effected than spark plug ignition. Consequently. it is important to avoid plasma jet impingement against combustion chamber wall. and to let flame front move toward wide place in the combustion chamber at early stage of combustion
박정서,이건주,정형진 安東大學校 農業科學技術硏究所 1995 農業科學技術 硏究論文集 Vol.2 No.-
페놀분해능이 있는 49균주를 이용하여 9종의 제초제에 대한 유일탄소원으고 이용능을 조사한 결과 4, 14번 균주는 조사한 9가지 제초제를 전부 유일탄소원 및 에너지원으로 이 용할 수 있었고, 5번 균주 등 6균주는 8가지 제초제에 자화능을 나타냈다. 1번 균주 등 5균주는 7가지 제초제를 자화할 수 있었고, 12번 등 13균주는 6가지 제초제를 유일탄소원으로 이용할 수 있었다. 3번 균주 등 4균주는 5가지 제초제, 15번 균주 등13균주는 4가지 제초제를 이용할 수 있었다. 42번과 43번 균주는 3가지 제초제를 유일 탄소원으로 이용할 수 있었으며, 25번, 29번, 32번, 39번, 47번 균주는 9가지 제초제에 대한 자화능이 없었다. 각 제초제 별로는 49균주중 2, 4-Dichlorophenoxy acetic acid가 42균주, propanil이 12균주 3-(3, 4-Dichlorophenyl)-1, 1-dimethylurea가 27균주, chlormethoxynil이 43균주, nitrofen은 16균주, bifenox는 11균주, Ioxynil은 20균주, simazine은 38균주, simetryn은 43균주가 유일탄소원으로 각각 이용하는 것으로 나타났다. 49 phenol degrading bacteria were isolated from soils were screened for the degradation of phytotoxic compounds. Tested nine kinds of phytotoxic compounds were 2, 4-D, propanil, DCMU, chlorrnethoxynil, nitrofen, bifenox, Ioxynil, simazine, slmetryn. From 49 strains, two strains (NO-4 and, NO-14) able to use 9 kinds of phytotoxic compounds as the sole source of carbon and energy. Among the tested strains, 6 strains (NO-5 and so) able to use 8 kinds, 5 strains (NO-1 and so) able to use 7 kinds, 13 strains able to use 6 kinds of herbcides as the sole source of carbon and energy. 4 strains (NO-3 and so) able to use 5 kinds of herbicides, 13 strains (NO-l5 and so) able to use 4 kinds of substrate. NO-42 and 43 were found to be capable of mineralization of 3 kinds of herbcides as the sole source of carbon and energy. Among the tested strains, NO-25, 29, 32, 39, 47 could not degrade 9 phytotoxic compounds. Among the 49 strains, 42 strains able to degrade for 2, 4-D, 12 strains for propanil, 27 strains for DCMU, 43 strains for chlormethoxynil and simetryn, 16 strains for nitrofen, 11 strains for bifenox, 20 strains for Ioxynil, 38 strains for simazine.