디젤-에탄올 혼합연료의 혼합비와 연료온도의 조건이 분무 미립화 특성에 미치는 영향

다국어 초록 (Multilingual Abstract)

This paper presents the effects of ethanol blending ratio and fuel temperature on the spray and atomization characteristics of a high pressure injection system. Three test fuels of ethanol blended fuels were utilized for studying the spray and atomization characteristics of blended fuels. Ethanol blending ratio was varied from 10% to 30%, and results of blended fuels were compared to those of an undiluted diesel fuel. A 5% biodiesel fuel as volumetric ratio was added to prevent the phase separation between diesel and ethanol fuels. The fuel temperature was controled in steps with 40K, from 290K to 370K. In order to investigate the spray characteristics, the spray tip penetration, spray cone angle and spray area were measured from spray images obtained from visualization system. It is revealed that the properties of test fuels, such as density, kinematic viscosity, and surface tension were decreased in proportion to increasing the fuel temperature and ethanol blending ratio. According to the increase of the evaporation quantity and the decrease of density, viscosity and surface tension due to the increase of fuel temperature, the spray tip penetration and spray cone angle become shorter and narrower respectively. As the fuel temperature increases, the spray area of test fuels become smaller due to the enhancement fast evaporation.