Spray in cross flow of a rotary atomizer

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DOIResolve DOI: http://doi.org/10.1615/AtomizSpr.2012005049
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TypeArticle
Journal titleAtomization and Sprays
ISSN1044-5110
Volume22
Issue2
Pages143161; # of pages: 19
SubjectCross flows; Malvern; Rotary atomizers; Spray; Weber numbers; Drops; Fuel systems; Orifices; Speed; Surface mount technology; Flow velocity
AbstractThis paper presents an experimental investigation of fuel sprays generated by a rotary atomizer exposed to a cross flow of air. The effects of two variables, the rotational speed and cross-flow velocity, on the droplet sizes were studied. The rotary atomizer was driven at speeds up to 15,000 rpm with a fuel flow rate of 15 kg/h and cross flow from 10 to 150 m/s. For any given rotational speed, the fuel droplet sizes decreased as the air cross flow increased, reaching an almost constant value of about 8 μm at 150 m/s cross-flow velocity. At cross-flow velocities less than about 50 m/s, the fuel droplet sizes decreased as the rotational speed increased. However, at a cross-flow velocity greater than 100 m/s, the fuel droplet sizes did not changed significantly as the rotational speed increased. Of the two variables studied, each influenced the droplet size differently in a certain cross-flow velocity region. The rotational speed influenced the droplet size at relatively low cross-flow velocity. By exceeding a cross-flow velocity of 75 m/s, the dynamic effect of high-speed cross flow became dominant. This effect can be generalized to the Weber number based on the orifice diameter and the non-dimensional droplet size. In this correlation, the following three distinct spray regimes were identified according to the Weber number based on orifice diameter: rotation dominant, intermediate, and cross flow dominant. © 2012 by Begell House, Inc.
Publication date
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number21270059
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Record identifier21eab64c-9f29-4115-aae7-ad7df96387fd
Record created2013-12-18
Record modified2016-05-09
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