Aerodynamic Breakup of a Single Droplet due to a Crossflowed Airstream

Copyright © 2019 by Gabriel A. C. Carrolo; Daniela F. S. Ribeiro; Jorge M. M. Barata; André R. R. Silva. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.The main breakup regimes are visualized and studied with the help of a high-speed camera and a continuous jet of air, provided by a wind tunnel, is used to transition the droplet into the various stages of secondary atomization. The use of Jet Fuel and Biofuel mixtures is the focal point of this study. All the known regimes are encountered and each transitional We is calculated. The variation of We due to Oh is described, in addition to the comparison between We number thresholds and correlations existent in the literature for each regime transition. The influence of these numbers on the dimensionless characterization of time and later the maximum cross stream diameter is shown. Finally, a correlation for the temporal evolution of the drops’ cross stream diameter for all regimes, assuming its deformation is not a linear function of time, is proposed.The present work was performed for the interinstitutional project BISI Biofuel Spray Impact in Aero-Engines under the scope of Laboratório Associado em Energia, Transportes e Aeronáutica (LAETA) activities and it was supported by Fundação para a Ciência e Tecnologia (FCT) through the project UID/EMS/50022/2013, and by Fundação Luso-Americana para o Desenvolvimento (FLAD) through the project 07/2019. Fundação Luso-Americana para o Desenvolvimento (FLAD) Project 07/2019