SIMULATION STUDY ON THE SPRAY CHARACTERISTICS OF PALM OIL DIESEL BLEND BY USING DISCRETE PHASE MODEL
DOI:
https://doi.org/10.11113/jurnalteknologi.v88.22541Keywords:
Spray characteristics, atomization, droplet size, Sauter mean diameter, palm oil diesel blendAbstract
Palm oil diesel blend is being promoted as a practical and greener alternative to fossil-based fuels such as petrol and diesel. To be utilised in diesel engines, this biofuel, also referred to as biodiesel, is frequently mixed in different proportions with petroleum-based diesel fuel. However, the usage of biofuel degrades the engine performance due to its poor spray characteristics and atomization. The spray characteristics and atomization of fuel are important aspects during the combustion process, as they affect the combustion efficiency and pollution emissions. In this study, the fuel spray model of palm oil diesel blend (PODB) was developed using Ansys Fluent software. The initial model was developed based on the diesel injection process and then was used for palm oil and its blend with diesel. Further investigations were conducted on the effects of nozzle hole size, injection pressure, and blend ratio. The validation of the developed spray model was conducted by comparing it to previous experimental and simulation studies by other researchers. The percentage of error was found to be at about 8.25 % and 10.64 % compared to experimental and simulation studies, respectively. From the analysis, it was found that higher density and viscosity PODB would produce longer tip penetration, a narrower cone angle, and a larger Sauter mean diameter (SMD). A significant effect was shown where higher injection pressure and larger nozzle hole size would produce longer tip penetration and smaller SMD.
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