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      저자 : Raghu Palani (검색결과 1 건)
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        Spray characteristics of diesel and derivatives in direct injection diesel engines with varying injection pressures

        Raghu Palani,Nallusamy Nallusamy,Pitchandi K 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10

        The combustion and emission characteristics of inedible oils and their derivatives are quite different from those of mineral diesel; inparticular, inedible oils and their derivatives present higher molecular, relative density, and vaporization characteristics. These propertiesexert great impacts on the fuel spray as well as the interactions of this spray with air in the combustion chamber. Thus, examining spraycharacteristics, including spray cone angle, spray tip penetration, spray area, and fuel atomization, is necessary. The spray characteristicsof fuel mainly depend on the fuel injection pressure, density, viscosity, ambient pressure, and temperature. Among these parameters, fuelinjection pressure significantly affects the spray structure. In this study, experiments were conducted using diesel, jatropha oil methylester, karanja oil methyl ester, and two biodiesel blended fuels (JB20 and KB20)] as fuels in a diesel engine with different injection pressures. Optical techniques for spray visualization and image processing are very efficient tools for analyzing the spray parameters of thetested fuels. Macroscopic spray properties, such as spray tip penetration, spray cone angle, and spray area, were acquired from imagescaptured by a high-speed video camera. The Sauter mean diameter and spray volume of all of the tested fuels were also estimated. Experimentalresults showed that the biodiesel blends demonstrate features different from those of diesel fuel. KB100 presented the highestspray tip penetration and spray area, followed by JB100 JB20, KB20 and diesel. Diesel fuel showed the best spray parameters, followedby JB20, KB20, KB100 and JB100. The tested fuels exhibited better spray characteristics at higher injection pressures than at lower ones.

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