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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v11.i4.30
pages 335-350

ON THE INFLUENCE OF INTERNAL FLOW STRUCTURE ON PERFORMANCE OF PLAIN-ORIFICE ATOMIZERS

Changhai Xu
School of Aeronautics and Astronautics, Purdue University, West Lafayette, Indiana, USA
R. A. Bunnell
School of Aeronautics and Astronautics, Purdue University, West Lafayette, Indiana, USA
Stephen D. Heister
Maurice J. Zucrow Laboratories, Department of Aeronautics and Astronautics, Purdue University, West Lafayette, Indiana, USA

SINOPSIS

A series of parametric simulations was conducted to investigate the unsteady internal flow behavior in plain orifice, or “pressure” atomizers. The unsteady behavior is attributed to instabilities in the vena contracta and the presence of cavitation in this region. Even though the present calculations are laminar, they exhibit turbulent-like characteristics due to this instability. Orifice mass flow is shown to be periodic in most instances with fluctuations occurring at frequencies consistent with the orifice transit time. Cavitation is shown to enhance fluctuations, in some cases quite dramatically. Results are presented for a range of flow conditions and orifice geometries.


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