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雾化与喷雾
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ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.v9.i5.30
pages 483-496

UNIFORMITY OF SWIRLED SPRAYS FORMED WITH NOZZLES OF VARYING SURFACE ROUGHNESS

K. Ramamurthi
Thermodynamics and Combustion Laboratory, Indian Institute of Technology, Madras, Chennai 600036, India
R. Patnaik
Propulsion Research and Studies Group, Liquid Propulsion Systems Centre, Trivandrum, India

ABSTRACT

Nonuniformity of hollow conical sprays has been determined experimentally for different values of surface roughness of the injection nozzle of swirl atomizers. The discharge coefficient of the atomizers has also been evaluated for the different surface roughnesses. Nonuniformity was found to be enhanced as the surface roughness of the nozzle increased. The extent over which the nonuniformity persisted, however, decreased with increase of the surface roughness. A nonuniformity parameter was defined to characterize the mass flow variations along the circumference of the spray. Sprays having nonuniformity coefficient less than 0.02 were seen to be formed when the thickness of the liquid film in the nozzle exceeded the surface roughness by a factor of about 1000.


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