首页|Experiments and modeling of discharge characteristics in water-mist sprays generated by pressure-swirl atomizers

Experiments and modeling of discharge characteristics in water-mist sprays generated by pressure-swirl atomizers

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Pressure-swirl atomizers are often employed to generate a water-mist spray,typically employed in fire suppression.In the present study.an experimental characterization of dispersion (velocity and cone angle) and atomization (drop-size axial evolution) was carried out following a previously developed methodology,with specific reference to the initial region of the spray.Laser-based techniques were used to quantitatively evaluate the considered phenomena:velocity field was reconstructed through a Particle Image Velocimetry analysis;drop-size distribution was measured by a Malvern Spraytec device,highlighting secondary atomization and subsequent coalescence along the spray axis.Moreover,a comprehensive set of relations was validated as predictive of the involved parameters,following an inviscid-fluid approach.The proposed model pertains to early studies on pressure-swirl atomizers and primarily yields to determine both initial velocity and cone angle.The spray thickness is also predicted and a classic correlation for Sauter Mean Diameter is shown to provide good agreement with experimental results.The analysis was carried out at the operative pressure of 80 bar;two injectors were employed featuring different orifice diameters and flow numbers,as a sort of parametric approach to this spray typology.

Water mistPressure-swirl atomizersAtomizationVelocityCone angle

Paolo E.Santangelo

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Department of Fire Protection Engineering,University of Maryland,3106 J.M.Patterson Building,College Park,MD 20742,USA

author wishes to thank Prof.A.W.Marshall,Prof.P.Tartarini,Dr.N.Ren,Dr.L.Tarozzi and Dr.P.Valdiserri for their help and suggeBettati Antincendio S.r.1.and Regione Emilia-Romagna

2012

10.1007/s11630-012-0579-5

热科学学报(英文版)
中国科学院工程热物理研究所

热科学学报(英文版)

CSCDSCIEI
影响因子：0.233
ISSN：1003-2169
年,卷(期)：2012.21(6)
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