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1 2019

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A review of the behavior of fuel drops in a fuel spray in the context of biofuels

Kägo Riho, Ilves Risto, Küüt Arne, Olt Jüri

Journal of Power Technologies

2019

Vol. 99, nr 3

218--230

In addition to gasoline and diesel fuel, the biofuels HVO and FAME have been taken into wide use during the last decades. The properties of gasoline and diesel fuel and their effect on the combustion process have been studied for a long time, but studies on HVO and FAME are still are very much work-in-progress. Existing studies show that the use of biodiesels reduces the level of several exhaust gas emissions (like soot) in engine exhaust gases. At the same time, the reasons for the reduction of emission compounds remain unclear. The motivation behind determining drop size and behavior is to aid assessment of the quality of the air-fuel mixture with a view to explaining the reduction in soot emission when biodiesels are used. The aim of this review paper is to provide an overview of the behavior of fuel drops and their size in fuel injectors when using different biofuels by giving a theoretical background based on literature, on the basis of which the calculations give an opportunity to evaluate experimental results of the behavior of different biofuels in the fuel spray. This study compares four different fuel types according to the WAVE-RT model. In addition, the collision mechanisms of drops (reflexive and stretching separation) are presented and these shall be compared for the fuel types. The results show that during the use of biofuels, the drop size is somewhat larger compared to diesel fuel.