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[디젤엔진부문] 이종연료 층상분사를 이용한 디젤엔진의 NOx와 soot 동시 저감에 관한 연구
강병무(B.M. Kang),김종률(J.Y. Kim),이태원(T.W. Lee),정성식(S.S Chung),하종률(J.Y. Ha) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
<br/> ~~.A\-%7}t'--c:j-~ 2000\15:. ~;>jI~t:1J~<br/> 2000-03-2041<br/> 01<br/> 3S. 91 ~ ~A~~<br/> A<br/> L.s:.<br/> OI<br/> Ho~<br/> c:"~.n. C::>C>c r2. C:::>L ;<br/> C/~2!!~~ NOx$ soot ~AI AI~OU ~~ eF?<br/> 7J'!!-';'-, 7,J'6-it(%ottJI-o:}jj! tJI~~), 01I11~(~~ ~~tJI-O:}), '\J'\J-6j, "6J-'6-iH%ottJI-o:}jj!)<br/> A Study on the Simultaneous Reduction of :>iOx and Soot<br/> with Dual Fuel Stratified Injection System in a Diesel Engine<br/> B. 1\1. Kang, ]. Y. Kim(Graduated School of Dong- A L'niv'>, T. W. Lee(Changwon CQUage), S. S. Chung, ]. Y. Ha(Dong-A Univ,)<br/> ABSTRACT<br/> To investigate the method of the simultaneous reduction of Soot and NOx, we developed a new conception for dual fuel stratified injection system in a Diesel Engine.<br/> Some parts of the injection system, ie. nozzle holder, delivery vale. were remodeled to inject diesel and methanol in order from one injector. The Quantity of diesel and methanol was controled precisely by micrometers that were mounted at control lack of injection pump.<br/> The real injection Quantity ratio of dual fuel was certificated by volumetric ratio at injection Quantity experiment. We could confirm the capability that soot and NOx simultaneously were reduced by diesel-methanol stratified injection from the results of combustion and exhaust characteristic.<br/>
Piston Cavity 형상에 따른 충돌분류의 분무거동
이상석(S. S. Lee),김근민(K. M. Kim),김봉곤(B. G. Kim),정성식(S. S. Chung),하종률(J. Y. Ha) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.3
In a small high-speed D. 1. diesel engine, the injected fuel spray into the atmosphere of the high temperature and pressure is burnt by go through the process of break up, atomization, evapora-tion and process of ignition. These process are important to decide the emission control and the rate of fuel consumption and out put of power. Especially, in the case of injected fuel spray im-pinging on the wall of piston cavity, the geometry of piston cavity gives great influence the ignitabiltiy of injected fuel and the flame structure. Ordinary, the combustion chamber of driving engine have unsteady turbulent flow be attendant on such as the change of temperature, velocity and pressure. So the analysis of spray behavior is difficult.<br/> In this study, the spray was impinged on the wall of 3 types of piston cavity such as Dish, To-roidal, Re-entrant type, in order to analyze the combustion process of impinging spray precisely and systematically. And hot wire probe was used for analyze non-steady flow characteristics of impinging spray, and to investigate the behavior of spray, the aspects of concentration c(t), stan-dard deviation σ(t) and variation factor(vf) was measured with the lapse of time.<br/>
윤수한(S.H.Yoon),이중순(J.S.Lee),전대수(D.S.Jun),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
In this research, we use IDI type constant volume combustion chamber which is made possible to stratified combustion to construct the design back data of lean-burn engine. Some experiments are conducted by the passagehole angle in the adapter of main and sub-chamber. The effects on the comustion according to the discharge characteristics are investigated. The used fuel is methanol prospective as an alternative fuel. Flame propagation process in the main and sub-chamber are analyzed by pictures. As the results experiments, combustion characteristics reveals that ignition timing, passagehole angle.and discharge method greatly effects on.<br/>
박종상(C.S.Park),이명준(M.J.Lee),이태원(T.W.Lee),하종률(J.Y.Ha),정성식(S.S.Chung) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
The process of moisture evaporation, ignition delay, and volatile combustion of single CWM droplet was observed with the variation of initial droplet diameter at the surrounding temperatures of 1173K and 1373K.<br/> Results for the variation of the mass, the mass fraction burned, and the density of droplet are the followings<br/> The process of the moisture evaporation and the volatile combustion is largely effected by the surrounding temperature and the initial droplet diameter, also 60of initial mass is reduced during this reaction period.<br/> The effect of the surrounding temperature upon the density variation of droplet is little, on the other hand the decrease of droplet diameter accompanies with about 10reduction of density.
점화에너지 특성이 예혼합기의 착화와 연소에 미치는 영향
이중순(J. S. Lee),이태원(T. W. Lee),정성식(S. S. Chung),하종률(J. Y. Ha) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.1
In this paper, we study effect of the factors, participating in the combustion as the initial conditions, such as the flow characteristics of the mixture and the initial temperature, pressure and equivalence ratio in the chamber on the ignitability of the mixture, the combustion duration and the maximum combustion-pressure. The experiment was performed in a constant-volume combustion chamber, with turbulent flow inside, equivalent to the actual engine at TDC. The present experiment utilizes three ignition devices which differ from each other in the distribution and the magnitude of discharge energy.
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.6_1
For a digital engine control system, control timings such as ignition and injection are based on the crank shaft angle. Therefor, it is very important that the angle of the crank shaft have to be detected with accuracy for the fuel injection and ignition timing, the sequential multi-point injection(MPI) system that has a independent injector in each cylinder, is used to inject the fuel of the accurate quantity, and to cope with varying of the engine status. The distributorless ignition(DLI) System that is the direct ignition method, is used for the accurate ignition and the flexible ignition timing. We install a sensor that occurs a number of events for the accurate detecting of the angle of the crank shaft.<br/> This study aims to make a event detecting algorithm, a method to detect the crank shaft angle by a event, and a software witch output a control signal at the given angle values.<br/>
이종승(J. S. Lee),이중순(J. S. Lee),정성식(S. S. Chung),하종률(J. Y. Ha) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.3
For digital engine control timings, such as ingition and injection, are based on the crank shaft angle. Therefore, it is very important that the angle of the crank shaft can be detected with accuracy for optimal ignition timing. Sequential multi-point injection(MPI) systems that have independent injection events for each cylinder, are used to inject an accurate quantity of fuel, and to cope with varying engine status promptly. In this study the distributorless ignitionCDLDsystem that is direct ignition method, is used for accurate ignition and flexible ignition timing. A crankshaft position sensor has been installed such that it generates a number of pulses per crankshaft revolution to permit accurate detection of the crank shaft angle.<br/> An event detecting algorithm has been developed, which detects the crank shaft pulses generated by the position sensor, and the software outputs the required control signals at given crank angle values. We clarified that the hardware method is the best way to increase the performance of the control system, because the event detecting duration T(l+2)m3x becomes zero.<br/>
이중순(J.S. Lee),김진영(J.Y. Kim),이종숭(J.S. Lee),정성식(S.S. Chung),하종률(J.Y. Ha) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.4
A new ignition system concept was developed to improve ignition performance, accuracy of control and the reliability of the ignition system. This new ignition system has high frequency discharge characteristics with 1.5-2.0 ms discharge duration, in place of the usual solitary longer duration event. We applied the system to a commercial engine to study its influence on the maximum combustion pressure attained during the cycle, when this peak pressure occured, imep, variation rate of the engine speed and the flammability limit of a lean mixture. In this study, we clarified that the new ignition system had a beneficial effect on the lean mixture flammability limit. Also for a given mixture strength we found that the new ignition system gave a higher peak cylinder pressure than in the case of the conventional ignition system.
이중순(J. S. Lee),김진영(J. Y. Kim),정성식(S. S. Chung),하종률(J. Y. Ha),배충식(C. S. Bae) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.5
Lean burn combustion is an important concept for improving the fuel consumption and exhaust emissions. However, the lean burning is associated with increased cy치e-to-cycle combustion variations due to the ignition instabilities and reduced flame propagation rates. Engine stability under lean mixture conditions could be improved by increasing flame speed through enhanced flow characteristics and by securing ignitability with improvment of ig-nition systems.<br/> The effects of flow motion and ignition characteristics on the combustion performances were investigated in a 4-valve SI engine. Flow motions of tumble -swirl were varied with a 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 bum performance by the optimum flow motion and ignition characteristics is discussed.<br/>