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RISS 인기검색어
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- 저자 : 정성찬(S.C.Chung) (검색결과 7 건)
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선회익위치(旋回翼位置)에 따른 선회화염(旋回火焰)에 관한 연구(硏究)
정성찬,채재우,Chung, S.C.,Chae, J.O. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.2
The swirl flame was investigated experimentally by measuring the temperature distribution, and the combustion gas concentrations. The flame structure of the swirl flame was influenced not by the swirl vane angle but by the swirler position. Due to the momentum loss as the swirler position was moved downward under the nozzle exit, the flame length was increased. Meanwhile the temperature and $CO_2$-concentrations were decreased.
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가솔린-알코올 혼합연료의 연소 및 배기특성에 관한 연구
정영식(Y.S.Jeong),최동천(D.C.Choi),조원진(W.J.Jo),정성찬(S.C.Chung),채재우(J.O.Chae) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
Because alcohol or ether contains oxygen and has ability improve octane number compared with gasoline, it is used as a clean fuel for low emissions and performance improvement. But it is necessary to adjust fuel supply system and operating conditions due to low heating value, high latent heat of vaporization of fuel. Therefore, this experiment is conducted to investigate for studying the effects of equivalence ratio and spark timing on intake mixture temperature, MBT, torque, brake specific fuel consumption, brake thermal efficiency as a basic performance, and conbustion pressure and combustion duration for combustion analysis. And with measurement of emissions like NOX, CO and HC, low emission characteristics and operating conditions for performance improvement with gasoline-alcohol blends are also considered.<br/>
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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.
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Ionization Probe를 이용한 디젤기관의 연소 해석(Ⅱ)
채재우(J.O.Chae),정성찬(S.C.Chung),정영식(Y.S.Jeong),양준석(J.S.Yang) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
Recently, using the diesel engine is increased rapidly. They have several advantages as power sources giving a high efficiency and reliance. But the increment of air pollutant emitted from automotive has been serious problems.<br/> Here it is important to analyze combustion phenomena in diesel engine, because the exhaust gas characteristic of diesel engine is closely related to combustion phenomena of its combustion chamber. This study was carried out for combustion analysis in DI diesel engine using ionization probe. As the results, the shape and characteristics of ionization, pressure signals were almost similar. With increase of engine speed and intake air temperature, the ignition delay became shorter, and the combustion duration became long. Therefore, the ionization probe can be used for combustion analysis instead of relatively expensive pressure sensor.<br/>
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채재우(J. O. Chae),정성찬(S. C. Chung),백중현(J. H. Baek) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.6
. Combustion of diesel engine depends on the mixing of air and evaporating fuel during ignition delay greatly. Variation of air-fuel mixing rate and ignition delay for engine operating condition causes difference of combustion, performance and exhaust emissions. This study is investigated in a turbocharged diesel engine of IDI swirl chamber type. In the results, As injection timing is advanced until 12.60 ETC, ignition delay decreases. NOx concentration and smoke level in exhaust gas increases for advanced injection timing. Ignition delay, combustion period, pressure rise rate and exhaust gas temperature are increased with increasing engine speed. And ignition delay at high load is more decreased than that at low load. Ignition delay and combustion period are decreased with increasing intake pressure. Power increases, temperature and CO, NOx concentration in exhaust gas decreases as intake pressure increases. With increasing load, ignition delay is decreased and combustion period, motoring pressure are increased.
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