Numerical study on the effects of using different concentrations of FAME blends on the spray structure of the injection process

Abstract

The present paper takes a closer look at the injection process characteristics for different conditions when there are used different FAME blends. Using a numerical approach, this work highlights the main implications and differences in terms of geometry, structure, and physical parameters of the injected fuel spray, when alternating the used fuels. In this attempt, AVL FIRE was used as simulation software solution giving the chance to alternate the used fuels and furthermore to create a direct link between the fuel properties, internal flowing, and jet spray characteristics. Because of the environmental and economic reasons, there are a growing tendency of using biofuel blends in increasing concentrations, as ample consumption of commercial fuels. As the physical properties of the Fatty Acid Methyl Ester fuels are very different compared with conventional diesel fuel, we expect that the fuel blends between them will show different behaviors in terms of internal nozzle flowing and thus it will generate different injection characteristics, being closely related with the biofuel concentration. The main objective of this paper is to set a dependency between the used fuels, nozzle geometry, and injection parameters that should be adapted, to meet the emissions standards and to obtain a properly burning.