Microscopic spray characteristics from a multi-hole port fuel injector using optical diagnostic technique
Ednir Luis Pedro Nigra Junior1; Márcio Expedito Guzzo2; Carlos Alberto Gomes Júnior3; José Eduardo Mautone Barros3; Rogério Gonçalves dos Santos1
1 Universidade Estadual de Campinas; 2 Centro Federal de Educação Tecnológica de Minas Gerais; 3 Universidade Federal de Minas Gerais
doi:10.20906/CPS/COB-2015-2009
Resumo
The spray structure of the fuel injectors of internal combustion engine have been widely studied by researchers around the world in order to reduce the greenhouse gases and introduce the use of environmentally friendly fuels, such as the case of ethanol. In the present work, experiments were performed with the purpose of investigating the atomization process of an internal combustion engine pressure-swirl atomizer. The bio-fuel ethanol, Brazilian standard gasoline type C and E50 (50% ethanol, 50% gasoline in volume) were used as test fluids. Phase Doppler Anemometry was used to measure the atomization parameters, such as: droplets mean diameter, droplet size distributions and droplet velocities. The measurements were taken 25 mm downstream from the injector tip along the axis with 0.3 MPa injection pressure and pulse-width of 5.9 ms. The droplets mean diameter were expressed in terms of Sauter Mean Diameter (SMD). The results showed that SMD remained insensitive to the different tested fuels. On the other hand, the droplet spray distributions and droplet velocities have had a slight variation.
Palavras-chave: atomization; ethanol; ethanol-gasoline blend; gasoline; multi-hole port fuel injector