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DME-Butane 혼합연료들의 분사 특성에 관한 실험적 연구
방승환 신한대학교 2021 신한대학교 논문집 Vol.44 No.-
This paper describes the effect of DME-Butane blended fuels on the injection characteristics in a high pressure diesel injection system. In this work, the blending ratios of Butane in the blended fuel are varied from 10 to 30% by weight ratio. An injection rate measurement system was constructed to analyze the injection properties of DME mixed with the Butane. As a result, the dispensing characteristics of DME-Butane mixed fuel and diesel fuel were well matched with the tendency to increase density and decrease viscosity. It was determined that the similar in test fuel injection delay time had an effect on the butane mixing ratio of the test fuel.
방승환 신한대학교 2022 신한대학교 논문집 Vol.제45집 No.-
The purpose of this study was to conduct a comparative study on the impingement spray development characteristics of the fuel of the CI engine in which 2 phases fuel is mixed with biodiesel and DME. Impingement spray development characteristics of fuel mixed with by 25% DME increses by weight in biodiesel were compared and analyzed with diesel fuel. In order to compare impingement the spray development characteristics of the experimental fuel, the spray penatration hight and cross-sectional area of the impinged spray were analyzed by fuel. The impinged spray development process of the experimental fuel showed a similar trend until the beginning of spraying. Depending on the characteristics of the experimental fuel, the development of spray after collision showed a difference in collision spray as the pressure of the atmosphere increased, and showed a different tendency depending on the mixing ratio of the two-phase mixed injection fuel. The change in the cross-sectional area of collision spraying showed a decrease as the mixing ratio of DME increased over time, and as the injection pressure increased, the difference in the experimental fuel price according to the mixing ratio increased more. In conclusion, the development of collision spraying is expected to change significantly depending on the change in the mixing ratio of two-phase mixed fuel, the difference in injection pressure, and the difference in atmospheric density.
방승환 신한대학교 2021 신한대학교 논문집 Vol.44 No.-
The purpose of this study was to conduct a comparative study on the spray development characteristics of the fuel of the CI engine in which ethanol is mixed with biodiesel. Spray development characteristics of fuel mixed with 50% ethanol by weight in diesel fuel and biodiesel were compared and analyzed with DME, a meteorological fuel. In order to compare the spray development characteristics of the experimental fuel, the spray penatration and cross-sectional area of the spray were analyzed by fuel. The spray development process of the experimental fuel showed a similar trend until the beginning of spraying, but from the 0.9 ms region after spraying, biodiesel mixed with diesel and ethanol showed similar spray reaching distance, and in the case of spray angle, the spray angle was large and then showed a similar trend.
BOS법을 이용한 함산소 연료들의 충돌분무특성에 관한 실험적 연구
방승환,Bang, Seung Hwan 한국분무공학회 2020 한국액체미립화학회지 Vol.25 No.3
This paper describes the effect of DME, biodiesel blended fuels on the macroscopic spray characteristics in a high pressure diesel injection system using Background Oriented Schlieren (BOS) method. The BOS method for visualization of impingement evaporation sprays to analyze macroscopic spray properties and evolutionary processes. In this work, the blending ratio of DME in the blended fuel are 0, 50, 100% by weight ratio. In order to investigate the macroscopic impinged spray characteristics under the various injection parameters and blending ratio. In this work, a mini-sac type single-hole nozzle injector with nozzle hole was length 0.7 mm and diameter of 0.3 mm was used. According to the result, the spray area of the collision wall increased as the DME mixing ratio increased, and the evolutionary pattern showed a stepwise increase due to the collision effect of the wall. Also, results of impinged spray area were increased according to increasing injection pressure.