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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v8.i3.60
pages 349-362

BIMODAL DROP SIZE DISTRIBUTION BEHAVIOR IN PLAIN-JET AIRBLAST ATOMIZER SPRAYS

Ronen Harari
The Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel
Eran Sher
Professor Emeritus, Technion - Israel Institute of Technology

ABSTRAKT

A plain-jet, external-mixing, airblast atomizer has been studied. A bimodal drop size distribution behavior has been observed, where two different drop size populations have been identified. It was observed that as a result of the impingement of the air stream on the liquid jet, a portion of the liquid flows back toward the orifice, arrives at the orifice surface, spreads outward as a thin film in the radial direction, and is then atomized by the air stream emerging from the annular slot. While the large-drop population is generated by the atomization process occurring at the liquid-air collision region, the small-drop population is generated by the backflow mechanism. This phenomenon has been studied experimentally and an approximate analysis has been proposed to describe it.


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MODEL OF THE FUEL JET PRIMARY ATOMIZATION AND AERODYNAMICS OF SPRAY FORMATION AT HIGH-PRESSURE INJECTION IN A DIESEL ENGINE
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