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류근영(Keun Young Ryu),하종석(Jong Suk Ha),노수영(Soo Young No) 한국분무공학회 2001 한국액체미립화학회지 Vol.6 No.3
The Effect of four diesel with oxygenated agents fuels on spray properties from plain-onfice atomizer was investigated. The oxygenates evaluated were diglyme, MTBE, DMM and were blended in weights of 5, 10, 15, 20 and 30% in a baseline diesel fuel. The physical properties such as surface tension, density and viscosity are also measured for each blended oxygenated fuels. It was found that in physical properties of fuels considered are enough to influence spray properties, i.e. spray angle, spray tip penetration and mean drop size. Spray properties were measured by PMAS(particle motion analysis system) which is employing a point measurement technology. Spray angle increased with increase in oxygenate content. The effect, however, was not great in the higher blend level. The oxygenated fuels produced more shorter spray tip penetration than diesel fuels. SMD was decreased with the increase in blending percent. SMD for DMM and DEE are represented 10.33 and 3.41% decreasing rates respectively. It found that changes in spray characteristics of oxygenated fuel were easily large enough to impact pollutant emissions. It was clear fern this study fat spray characteristics of oxygenated fuel is one of possible cause of reducing pollutant emissions form diesel engines when oxygenated fuels is applied.
분무선단 관통거리 예측모델의 Diesel 과 DME 분무에 대한 적합성
이동화(Dong-hua Lee),하종석(Jong-suk Ha),노수영(Soo-young No) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The prediction of spray penetration is of considerable practical importance in many fields such as diesel and gasoline direct injection engines. Many researchers have suggested the various correlations for spray penetration in diesel engines. In this study, five different correlations for spray penetration were selected. Detailed comparisons between different models for spray penetration and experimental results were conducted. High pressurized diesel fuel and DME were used for the validation of selected models. As a results the general format of spray penetration models will be proposed.
왕문무(Wen-wu Wang),하종석(Jong-suk Ha),노수영(Soo-young No) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
DME is known as an excellent alternative fuel that provides low particulate matter(PM) than diesel fuel under same engine operating conditions. Spray characteristics of Diesel and DME fuel in common rail injection system were investigated within the high pressure chamber by using the particle motion analysis system. The injector used in this study have single hole with the different orifice diameter of 0.2, 0.3 and O.4mm. The injection pressure was<br/> fixed at 35MPa and the ambient pressure were varied from 0.6 to 1.5MPa Macroscopic spray characteristics such as spray angle and spray penetration were measured.<br/> Same trends is obtained both Diesel and DME fuel for spray angle and spray penetration at all used orifice diameter. As ambient pressure is increased, spray angle is increase but spray penetration is decreased. Spray angle was measured at 30d_0 downstream of the nozzle tip for DME ,and 60d_0 downstream of the nozzle tip for Diesel fuel.
Diesel-Diglyme 混合燃料가 디젤엔진의 性能에 미치는 影響
문병수,한상덕,하종석,김한덕 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.1
While the amount of diesel engine is increasing, the harmful exhaust emission is regarded as one of the main causes of environment pollution. In this study, by using reformulated diesel fuel mixed with the oxygenate Diglyme in various ratios, the effects of the reformulations on engine's output performance and exhaust emission have been shown. The reformulated fuel mixed with oxygenate Diglyme shows an increase in output power while CO and SMOKE were lowered by using the regular diesel fuel. By applying the mixed Diglyme fuel to diesel engine, in general, some reduction of harmful exhaust emission could be achieved without any significant change of the output efficiency of the engine.