Internal flow characteristics in scaled pressure-swirl atomizer

Pressure-swirl atomizers are used in a wide range of industrial applications, e.g.: combustion, cooling, painting, food processing etc. Their spray characteristics are closely linked to the internal flow which predetermines the parameters of the liquid sheet formed at the discharge orifice. To achie...

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Bibliographic Details
Published inEPJ Web of Conferences Vol. 180; p. 2059
Main Authors Malý, Milan, Sapík, Marcel, Jedelský, Jan, Janáčková, Lada, Jícha, Miroslav, Sláma, Jaroslav, Wigley, Graham
Format Journal Article Conference Proceeding
LanguageEnglish
Published Les Ulis EDP Sciences 01.01.2018
Subjects
Atomizers
Atomizing
Computational fluid dynamics
Flow characteristics
Fluid flow
Food processing
Food processing industry
Gas turbine engines
High speed cameras
Industrial applications
Internal flow
Jet engine fuels
Kerosene
Orifices
Polymethyl methacrylate
Refractivity
Reynolds number
Spray characteristics
Velocity measurement
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Summary:Pressure-swirl atomizers are used in a wide range of industrial applications, e.g.: combustion, cooling, painting, food processing etc. Their spray characteristics are closely linked to the internal flow which predetermines the parameters of the liquid sheet formed at the discharge orifice. To achieve a better understanding of the spray formation process, the internal flow was characterised using Laser Doppler Anemometry (LDA) and high-speed imaging in a transparent model made of cast PMMA (Poly(methyl methacrylate)). The design of the transparent atomizer was derived from a pressure-swirl atomizer as used in a small gas turbine. Due to the small dimensions, it was manufactured in a scale of 10:1. It has modular concept and consists of three parts which were ground, polished and bolted together. The original kerosene-type jet A-1 fuel had to be replaced due to the necessity of a refractive index match. The new working liquid should also be colourless, non-aggressive to the PMMA and have the appropriate viscosity to achieve the same Reynolds number as in the original atomizer. Several liquids were chosen and tested to satisfy these requirements. P-Cymene was chosen as the suitable working liquid. The internal flow characteristics were consequently examined by LDA and high-speed camera using p-Cymene and Kerosene-type jet A-1 in comparative manner.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/201818002059