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Atomization and Sprays
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ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2019030691
pages 493-519

SPRAY ATOMIZATION CHARACTERISTICS OF A LOW PRESSURE ROTARY INJECTOR

Kushal Ghate
Institute Postdoctoral
Shraddha Sharma
Department of Mechanical Engineering, IIT Madras, Chennai 600036, India
Thirumalachari Sundararajan
Thermodynamics and Combustion Engineering Laboratory Department of Mechanical Engineering Indian Institute of Technology Madras, Chennai – 600036, India

RÉSUMÉ

Fuel atomization and droplet dispersion play vital roles for achieving efficient combustion inside a spray combustor. In the present study, a novel atomizer is developed which employs a rotating spindle with blades at the orifice exit to atomize the fuel into a fine spray. Important spray characteristics such as spray cone angle and Sauter mean diameter (SMD) are measured using a high-speed camera and a phase Doppler interferometer (PDI). This atomizer provides uniform fine sprays even at very low pressures of the order of 1 bar. The droplet size distribution and dispersion exhibit only minor dependence on the fuel flow rate or injection pressure. Criteria have been identified for three different liquid break up modes, namely, jet break up, sheet break up, and direct drop formation. Useful correlations for evaluating the spray droplet size (SMD) are presented in terms of the swirl number of liquid flow, rotational speed based sheet Weber number, and swirl air Reynolds number.

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