Differences in the evolution of combustion in a single cylinder, DI (direct injection)\ndiesel engine fuelled by B20 were observed upon processing of the respective indicator diagrams.\nAiming to further investigate the effects of biodiesel on the engine injection and combustion process,\nthe injection characteristics of B0, B20, B40, B60, B80 and B100 were measured at low injection pressure\nand visualized at low and standard injection pressures. The fuel atomization characteristics were\ninvestigated in terms of mean droplet velocity, Sauter mean diameter, droplet velocity and diameter\ndistributions by using a spray visualization system and Laser Doppler Velocimetry. The jet break-up\ncharacteristics are mainly influenced by the Weber number, which is lower for biodiesel, mainly due\nto its higher surface tension. Thus, Sauter mean diameter (SMD) of sprays with biodiesel blended-fuel\nis higher. Volume mean diameter (VMD) and arithmetic mean diameter (AMD) values also increase\nwith blending ratio. Kinematic viscosity and surface tension become higher as the biodiesel blending\nratio increases. The SMD, VMD and AMD of diesel and biodiesel blended fuels decreased with\nan increase in the axial distance from spray tip. Comparison of estimated fuel burning rates for\n60,000 droplets� samples points to a decrease in mean fuel burning rate for B20 and higher blends.
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