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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v16.i2.50
pages 223-236

NUMERICAL AND EXPERIMENTAL STUDY ON CYLINDRICAL SWIRL ATOMIZERS

M. R. Halder
Department of Mechanical Engineering, Khulna University of Engineering & Technology, Bangladesh
S. K. Som
Department of Mechanical Engineering, I. I. T. Kharagpur, India

SINOPSIS

The pressure swirl atomizer is widely used in liquid fuel combustion devices in the aerospace and power generation industries. The experimental and numerical predictions of air core diameter da, the coefficient of discharge Cd, and the spray cone angle ψ of a cylindrical swirl-spray pressure atomizer have been made in the present study. The standard k-ε model of turbulence is used for numerical computation of flow within the nozzle. The diameter of the stable central air core inside the nozzle has been predicted at given operating conditions. The values of Cd and ψ have been evaluated from the radial distribution of velocity components of liquid flow at the nozzle exit plane. It has been observed from numerical and experimental investigations that the coefficient of discharge Cd decreases, while the air core diameter da and the spray cone angle ψ increase with the increase in nozzle flow in its lower range. However, all these parameters, Cd, ψ, and da, finally become independent of nozzle flow. Both da/D and ψ increase but Cd decreases with a decrease in Dp/D for the nozzles of constant L/D, where Dp, D, and L are the entry port diameter, swirl chamber diameter, and length of atomizer, respectively. Also, both da/D and ψ decrease, while Cd increases with an increase in L/D for the nozzles of constant Dp/D.


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