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UV Laser Rayleigh Scattering을 이용한 C₃H_8/O₂ 화염에서 가스 성분의 농도 및 온도 분포 계측에 관한 실험적 연구
진성호(S. H. Jin),남기중(G. J. Nam),김회산(H. S. Kim),장래각(N. K. Chang),박승한(S. H. Park),김웅(U. Kim),박경석(K. S. Park),김경수(G. S. Kim) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.2
Rayleigh Scattering Cross Sections(σ_i)of various gases and the temperature distributions of premixed C3HJOz flame are measured by high power KrF(248nm) Excimer laser and ICCD cam-era. Results show that σ_i of 0₂, and Propane(C₃H_8) gases agree well in the 5% error range, but σ_i of H ₂ has the more or less difference from the calculated value by other groups. This is attributed to the low RS signal of H ₂ to Nosie level(S/N ratio).<br/> The temperature distributions of flame range out between 300K in the air and about 2000K in the burned area. In this temperature range, our system has the about 250K temperature resolution. Because low RS signals in the reaction area with high temperatue are affected highly by noises, temperature uncertainty of this area is relatively high to another part of flame.<br/> Experimental results show that UV Rayleigh Scattering can be used for the measurement of mixing ratio of mixed gases and the temperature distributions of flame. Especially, this technique can be applied for the measurement of the mixing ratio of air/fuel before the ignition and the flame structure after the ignition inside the Engine.<br/>
[論文] 자동차용 기관의 냉각수 온도조절 최적화에 관한 연구(I)
박경석(K.S.Park),신진식(J.S.Shin),이경우(K.W.Lee) 한국자동차공학회 1992 오토저널 Vol.14 No.2
The purpose of this study is to consider the performance and exhaust characteristics in the practical engine according to the cooling water temperature change of engine and to set up the optimum cooling condition and to obtain the optimum operating condition of thermostat in the cooling system. In order to accomplish the purpose of this study, authors have used the following procedure.<br/> 1. This study is to investigate the influence of the cooling water temperature on the engine performance and the exhaust gas, authors regulated the cooling water temperature by using the special closing circuit and measured the concentration of exhaust gas by using the exhaust gas measuring system in the exhaust pipe.<br/> 2. This study carried out the experiment by regulating the opening degree of throttle valve and engine speed in the dynamometer and by changing the cooling water temperature, at the same time kept air - fuel ratio constant and made the spark ignition time MBT (Minimum spark advance for Best Torque)<br/> 3. This study measured the cooling water temperature by using the K-type thermocouple centring around the easy over-heated parts and by installing a special closing circuit.<br/> Therefore, in this study, authors intend to examine the influence of the cooling water temperature on the engine performance, exhaust gas and present the basic materials needed in tte engine design including the optimum operating time control system for the cooling water temperature.
가솔린엔진에서 액막연료량 추정 및 이를 이용한 공연비 예측에 관한 연구
황승환(S.H.Hwang),이종화(J.H.Lee),박경석(K.S.Park) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
According to the stringent exhaust emission regulation, precise control of air fuel ratio is one of the most important issues on gasoline engine. Although many researches have been carried out to identify the fuel transport phenomena in a port fueled gasoline engine, complexity of fuel film behavior in the intake port makes it difficult. The fuel film behavior was investigated recently by using visualization method and these gave us qualitative understanding. The purpose of this pape is to estimate of wall wetting fuel in take port and The inducted fuel mass was predected using by wall wetting fuel model. The model coefficient(α ,β) and fuel film mass on the port wall was determined from measured in-cylinder HC consentration using FRFID after injection off. The Fuel film mass and a ( ratio of directly inducted fuel mass into cylinder from injected fuel mass) was increased with incresing load at the same engine speed. But 0 ( is nearly constant value(0.8-0.9). When injected fuel mass is varied at 1500rpm. the calculated air fuel ratio using well wetting fuel model was nealy the same as measured by UEGO.<br/>
스파크 점화기관의 연소 퇴적물 생성에 관한 연구 (Ⅰ)
장석형(S.H.JANG),박경석(K.S.PARK) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
A spark ignition engine was used to correct engine combustion chamber deposit(C.C.D.), intake valve deposit(I.V.D.), and piston top deposit(P.T.D.). In this study, the effect of gasoline additive on I.V.D. was investigated. Compared with base gasoline and additive mixed gasoline showed a remarkable deposit-forming tendency. And an test procedure has been developed employing a 1.5L P.F.I. (port fuel injection) engine on an engine dynamometer.<br/>
엔진運轉條件에 따른 排氣시스템의 壓力分布特性에 관한 硏究
김동현(D.H. Kim),박세종(S.J. Park),손성만(S.M. Son),박경석(K.S. Park) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
It is necessary to consider the stability, economic environmental-friendly problems by the development of the road, supply of the automobile, environmental problem as designing the exhaust system. To reduce the noise and the vibration of the automobile. The need for stricter regulation limits emission and demand for lower fuel comsumption. According to motor vehicle company develop variable type muffler, dual muffler and active intelligence exhaust system unit. Improvement in engine performance and fuel consumption for demand information of pressure fraction and heat characteristics. To be able to determine these factor for we experiment on each case of exhaust system unit. In this study, in order to establish the optimized conditions design factors which are taking many performance as the variable valve, it shows how the standard performance and the additional element of the exhaust system effects on the engine performance.
연료량 변조법에 의한 연료분사식 가솔린엔진의 공연비 제어
박경석(K. S. Park),박진일(J. I. Park),고상근(S. K. Kauh),노승탁(S. T. Noh),이종화(J. H. Lee) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.3
For the air-fuel ratio control in a fuel injection SI engine, the Jump-Ramp control algorithm has been widely adopted by using the on/off type oxygen sensor. But the Jump-Ramp control method has limitation on treating the frequency and amplitude of the air-fuel ratio oscillation. This study suggests another feedback control logic named modulated fuel feedback control, which has a con-cept of pre-tuned air-fuel ratio oscillation. In the modulation method, the oxygen sensor output is not treated as on/off signal but as analog signal for feedback. By using the modulation method, the frequency and the amplitude of air-fuel ratio oscillation can be adjustable to some extent for improving the conversion efficiency of the Three-Way Catalyst. The result shows that the per-formance of the modulation method is better than that of Jump-Ramp control method in reducing the amplitude of the air-fuel ratio oscillation as well as in increasing the frequency of the air-fuel ratio oscillation.<br/>
UV Laser Rayleigh Scattering을 이용한 가스 성분의 농도 및 온도 분포 계측에 관한 실험적 연구
진성호(S.H.Jin),남기중(G.J.Nam),김희산(H.S.Kim),장래각(N.K.Chang),박승한(S.H.Park),깅웅(U.Kim),박경석(K.S.Park),김경수(G.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
Rayleigh Scattering Cross Sections(σ_i) of various gases and the temperature distributions of premixed Propane/O₂ flame are measured by high power KrF(248nm) Excimer laser and ICCD camera. Results show that σ_i of O₂ and Propane(C₃H_8) gases agree well in the 5% error range. but σ_i of H₂ has the more or less difference from the calculated value by other groups. This is attributed to the low RS signal of H₂ to noise level(SIN ratio).<br/> The temperature distributions of flame range out between 300K in the air and about 2000K in the burned area. In this temperature range, our system has the about 250K temperature resolution. Because low RS signals in the reaction area with high temperature are affected highly by noises, temperature uncertainty of this area is relatively high to another part of flame.<br/> Experimental results show that UV Rayleigh Scattering can be used for the measurement of mixing ratios of mixed gases and the temperature distributions of flame. Especially. this technique can be applied for the measurement of the mixing ratios of air/fuel before the ignition and the flame structure after the ignition inside the Engine.<br/>