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다공성물질을 이용한 초단열 연소장치에서의 연소특성의 실험적 연구
채재우,심민섭,정성찬,Chae, J.O.,Dobrego, K.V.,Sim, M.S.,Chung, S.C. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.4
Beacuse of the energy resources exhaustion, the aggravating environmental air pollution and the smoke phenomena etc., the importance of clean gas fuel compared with liquid fuel is highly considered in recent years. The combustion system which consists of porous media is actively studied as a new method for solving above problems. Therefore, excess enthalpy combustion using porous media was interested by many researchers and investigated through numerical and experimental analysis. In this study, the simplified combustor has the unique combustion characteristics of mixture gas preheated effect using radiative and convective heat energy by changing the flow passage of unburned gas with solenoid valves and has the intensive excess enthalpy phenomena As the result of according to reduce equivalence ratio, flame temperature was remarkably higher than adiabatic flame temperature. This show the ability of super-lean combustion.
솔레노이드 밸브를 이용한 직접분사식 디젤기관의 분사율 제어 및 배기 저감에 관한 연구
채재우(J.O.Chae),이상만(S.M.Lee),황재원(J.W.Hwang),양이진(I.J.Yang),장석채(S.C.Chang),갈한주(H.J.Kal),정영식(Y.S.Jeong),A.A.Martychenko(A.A.Martychenko),Balin Andrei(Balin Andrei) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
A very fast solenoid valve has been developed to modulate the pressure of fuel pressure in the injection system of a D.I. Diesel engine. The working process of solenoid has been analyzed and calculated for each characteristic period. The modulated pressure by solenoid valve varies needle lifting process and therefore cause different injection rate. An investigation into the application of electronically controlled solenoid valve to reduce emissions of NOx and soot has been carried out in both conventional and newly designed solenoid valve actuated injection system. Conventional and electronically controlled comparisons of emission products were made under 1500 rpm engine speed, 3/4 load conditions. The outlook for the use of electronically controlled fuel injection technology is described in the light of the results obtained.<br/>
저온 플라즈마를 이용한 디젤엔진 soot 제거에 관한 연구
채재우(J.O.Chae),황재원(J.W.Whang),김관영(K.Y.Kim),이창신(C.S.Lee),선희석(H.S.Sun),김건우(G.O.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
The importance of the elimination of air-pollution caused by the increase of energy demands is requested seriously in these days. Especially, the diesel engine exhaust gas is very harmful and difficult to reduce with current methods. The exhaust gas treatment technology using non-thermal plasma is one of the advanced method, and has advantage of high removal efficiency with low energy consumption. In this study, the experiment is carried with 1 cylinder agricultural diesel engine, and it is shown the soot removal efficiency with various engine R.P.M. and different reactor types(square-shape electrode reactor, planar-type reactor, and mixed type reactor).<br/>
[論文] 연료분사노즐의 니들밸브 형상변화에 따른 분무특성에 관한 연구
채재우(J.O.Chae),임무룡(M.Y.Leem),오신규(S.K.Oh) 한국자동차공학회 1987 오토저널 Vol.9 No.4
The experimental study, using constant pressure injection system, is carried out to investigate the effect of the geometrical shape changes of the needle valve on the effective flow area, the spray angle and the Sauter's Mean Diameter according to needle valve lift for a pintle-type injection nozzle.<br/> The results are as follows:<br/> 1) With the increase of the needle valve lift, the effective flow area is increased, the spray angle is at first increased and later decreased, and the sauter's Mean Diameter is decreased.<br/> 2) It is also shown that the spray angle is maximum at the rapidly increased region of the effective flow area.
스파크플러그를 이용한 실린더내의 이상폭발검출에 관한 연구
채재우(J.O.Chae),박재근(J.K.Park),고용수(Y.S.Ko),조민석(M.S.Cho),황재원(J.W.Whang) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Detonation or knocking-effect. a kind of abnormal combustion, is a highly undesirable effect in the internal combustion engine. A spark plug is frequently used in detonation detection systems. The system created by the authors of the present paper is based on the effect of modulation of the breakdown voltage of the spark gap. The voltage drop between spark plug electrodes, when an electrical breakdown is initiated, depends on the local gas density. Detonation produces rapid changes in gas pressure (and. consequently, its density). A signal obtained from a spark plug carries information about the character of combustion. Possible algorithms of signal processing are discussed in the present paper.<br/>
성층급기 직접분사식 가솔린기관 개발에 관한 연구 (Ⅱ) -연료분사압력 및 부하변동에 따른 연소특성 해석-
채재우(J.O.Chae),이상만(S.M.Lee),조민수(M.S.Cho),노정용(J.Y.Noh),Li Jianwen(Li Jianwen),정영식(Y.S.Jeong) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
In general, the stratified charge for direct injection gasoline engine should be introduced to achieve ultra-lean combustion. In order to apply for the concept of stratified charge into direct injection gasoline engine, a reflector was adapted on cylinder head. An installation of the reflector in front of injector nozzle leads the mixture to be rich near spark plug. Therefore, the mixture near the spark plug is locally rich to ignite a fuel while the lean mixture is wholly introduced into the combustion chamber. In this paper, the characteristics of combustion is analyzed with the variations of injection pressure and load in a stratified-charge direct injection single cylinder gasoline engine. The results are summarized as follows ;<br/> 1. The MBT spark timing is influenced by engine rpm and load, but has a little relation with fuel injection pressure.<br/> 2. The MBT spark timing is approached to TDC with the increase of load on account of the increase of evaporation energy. Therefore, the peak pressure of cylinder is also delayed with the increase of load.<br/> 3. The stratification effect is cleared with the increase of injection. It is considered by the development of secondary diffusive combustion and the increase of heat release of same region, but proceed rapidly than diesel engine. Specially, in the case of high pressure inj-ection(170bar) and high load(3.0kgf ? m ), the diffusive combustion part is developed excessively and results to the increase of peak pressure than middle load.<br/> 4. The index of engine stability, COV_inwp value, is generally decreased with the increase of load. Finally, the 150bar injection pressure is appeared as optimum in this research.<br/>
채재우(J.O.Chae),이상만(S.M.Lee),박재근(J.K.Park),문승일(S.I.Moon),정영식(Y.S.Jeong),Alexander A. Martychenko(Alexander A. Martychenko) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Misfire in a cylinder of an Internal Combustion Engine (ICE) causes such problems as high poisonous exhaust gases, catalytic converter overload, noise, vibration, etc The operation regimes where misfire is most likely to occure are idling, acceleration and deceleration. Our system of misfire diagnostics is based on using a spark-plug as a sensor for detecting misfire. Rather a high bias voltage applied between its electrodes generates a corona discharge. The current and voltage drop on this discharge depend on the pressure and temperature between spark-plug electrodes in cylinders. Development of misfire detection system is introduced in this paper. Such a simple sensor as a spark-plug can be widely used for misfire detection.