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Atomization and Sprays
Facteur d'impact: 1.262 Facteur d'impact sur 5 ans: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v21.i1.20
pages 17-29

Geometric Primary Atomization Characteristics in an Airblast Atomizer, High Pressure Conditions

Vital Gutierrez Fernandez
Heterogeneous, Multiphase Flows Unit, Aerodynamic and Energetic Models Department, Office National d'Etudes et de la Recherche Aérospatiales (ONERA), Toulouse, France
G. Lavergne
Heterogeneous, Multiphase Flows Unit, Aerodynamic and Energetic Models Department, Office National d'Etudes et de la Recherche Aérospatiales (ONERA), 31055 Toulouse Cedex 4, France
P. Berthoumieu
Heterogeneous, Multiphase Flows Unit, Aerodynamic and Energetic Models Department, Office National d'Etudes et de la Recherche Aérospatiales (ONERA), 31055 Toulouse Cedex 4, France

RÉSUMÉ

An experimental study via fast camera visualizations was accomplished to analyze the primary atomization. The injection device consisted in a planar airblast atomizer, which generated a 300μm thickness liquid sheet. The system considered, kept its geometry constant, while the fluids flow was modified to produce a wide range of conditions. This was achieved by adjusting the fluids' momentum flux. In the case of the gas, both the air velocity across the airblast atomizer and its absolute pressure were varied. The latter parameter reached a value of 11 bar. Additionally, two liquids, water and Kerosene Jet A1 were injected at several velocities. The manuscript includes results for the break-up length, transversal wavelength, and longitudinal ligaments length. The behaviour of these characteristics was strongly affected by the atomization mechanism at which they were measured. Consequently, a set of image proceses techniques were developed to measure these characteristics. Finally, a set of empirical relsations are proposed to predict the magnitude of these characteristics at the tested conditions.