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[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.
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.
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/>
원통형 열가수분해 반응기의 최적설계를 위한 수치해석적 연구
박경석(K.S. Park),서진원(J.W. Seo),최윤호(Y.H. Choi),김호(H. Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Recently, THP(Thermal Hydrolysis Process) which enables high energy conversion efficiency and secures the economic efficiency is recognized as an effective method for recycling organic waste. Sewage sludge, having the highest portion of organic waste that can be recycled by using THP, is known to have effective THP at 200 V. In this paper, mixing characteristics of sewage sludge are investigated for several parameters(blade shape, rotating velocity, aspect ratio) associated with reactor in order to satisfy a target temperature of 200℃ for effective THP reaction. With this result, we developed a function relating aspect ratio and time to reach target temperature and suggested a guide for optimal design of THP reactor.
박경석(K.S.Park),송재익(J.I.Song),여정석(J.S.Yeo) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
It is a important facter to reduce automobile emissions. First of all, the after treatment method is required for LEV (Low Emissoin Vehicle) after LA-4<br/> mode limitation, the after treatment method is divided into two ways; Development of catalysis and reduction of catalyst activity time. Electrically heated<br/> monoliths have been designed and tested that are able to reach catalystic light-off temperature in less<br/> than 30 second using a conventional 12 volt electrical system. Gasoline vehicle emission data are presented that show substantial improvements in cold start HC and CO emissions by using resistance heating.
엔진 워터 재킷 내의 냉각수 유동 가시화에 관한 연구 (Ⅰ)
박경석(K. S. Park),정동화(D. H. Jung),구본우(B. W. Koo) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
It is widely recognized that exhaust emissions, fuel consumption and engine torque are affected by engine cooling temperature. And a cooling system keeping the proper engine temperature would improve engine performance and efficiency. Parameters which are necessary for the optimum design of thermostat to keep the best engine performance are determined. In this study, author measured coolant flow characteristics of some parts and visualization in water jacket which are necessary to analysis of thermal flow in an engine cooling system.<br/>
자동차용 서머스탯의 최적설계 변수설정에 관한 연구(Ⅰ)
박경석(K.S.Park),신진석(J.S.Shin),원종필(J.P.Won) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is widely recognized that exhaust emissions. fuel economy<br/> and engine torque are affected by engine temperature. and logic would suggest that a cooling system offering a better compromise of engine temperature would improve both overall engine<br/> performance and economy.<br/> Author measured coolant temperature of some parts and flow<br/> rate which are necessary to heat transfer in a engine. And<br/> Author determined parameters necessary for the optimum design of a thermostat to keep the best engine performance: determined the optimum operating temperature of electric cooling fan.<br/> A summary of this study is followed.<br/> 1. Study of the effects of cooling condition to combustion character in a engine. <br/> 2. Analyze of heat transfer surrounding engine cylinders.<br/> 3. Study of the effects of cooling character to engine heat<br/> rejection. determination of the optimum coolant temperature for keeping the optimum engine performance and determination of the optimum design of a thermostat for keeping that temperature.<br/>