Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Atomization and Sprays
Fator do impacto: 1.737 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 2.2

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

Volumes:
Volume 30, 2020 Volume 29, 2019 Volume 28, 2018 Volume 27, 2017 Volume 26, 2016 Volume 25, 2015 Volume 24, 2014 Volume 23, 2013 Volume 22, 2012 Volume 21, 2011 Volume 20, 2010 Volume 19, 2009 Volume 18, 2008 Volume 17, 2007 Volume 16, 2006 Volume 15, 2005 Volume 14, 2004 Volume 13, 2003 Volume 12, 2002 Volume 11, 2001 Volume 10, 2000 Volume 9, 1999 Volume 8, 1998 Volume 7, 1997 Volume 6, 1996 Volume 5, 1995 Volume 4, 1994 Volume 3, 1993 Volume 2, 1992 Volume 1, 1991

Atomization and Sprays

DOI: 10.1615/AtomizSpr.v16.i5.20
pages 493-510

CHARACTERISTICS OF TRANSIENT, SWIRL-GENERATED, HOLLOW-CONE SPRAYS

Julian T. Kashdan
I.F.P., Rueil-Malmaison, France
John S. Shrimpton
Energy Technology Research Group, School of Engineering Sciences, University of Southampton, United Kingdom, SO171BJ

RESUMO

The near-nozzle, global, spatial, and temporal characteristics of a hollow-cone spray produced by a pressure swirl-type atomizer have been investigated experimentally. Particular attention is given to the transient phase just after needle opening, which, for pulsed or intermittent atomizers, plays an all-important role in defining the global spray behavior and, more significantly, atomization quality. Qualitative and quantitative spray measurements have been achieved via the combined diagnostic techniques of high-magnification charge-coupled device (CCD) imaging and phase Doppler anemometry (PDA), which provides useful data not only in terms of improving the design and performance of pressure swirl atomizers, but also for the validation and refinement of numerical spray models. High-magnification CCD images of the intact near-nozzle liquid sheet reveal a certain degree of helical swirl motion, although laser Doppler velocimetry (LDV) results indicate that the tangential swirl motion imparted on the liquid sheet decays rapidly within the first few millimeters of the atomizer orifice to near-negligible levels. Images of the poorly atomized “preswirl spray” formed during the early transient phase of injection also revealed the presence of large, nonspherical liquid masses up to 1 mm in size, even as far as 72 nozzle diameters downstream. The spray-induced gas phase flow, which results in the characteristic toroidal vortex, was found to have a significant influence on droplet trajectories and segregation of the fast-moving large (D32 between 25 and 30 μm) and small (1−5 μm) droplets within the spray. Estimates of characteristic droplet Weber numbers have also been made, which, in general, were found to be less than the critical values required for secondary droplet breakup to occur.


Articles with similar content:

LARGE EDDY SIMULATION OF DROPLET STOKES NUMBER EFFECTS ON TURBULENT SPRAY SHAPE
Atomization and Sprays, Vol.20, 2010, issue 2
Harri Hillamo, Martti Larmi, Ossi Kaario, Laszlo Fuchs, Ville Vuorinen
2-D LASER SHEET VISUALIZATION OF A PULSED HOLLOW CONE SPRAY: STAGNANT AND SIMULATED TWO-STROKE ENGINE ENVIRONMENTS
Atomization and Sprays, Vol.1, 1991, issue 1
Douglas Talley, M. Morris, Y. C. Lin
The Effect of Manifold Cross-Flow on the Discharge Coefficient of Sharp-Edged Orifices
International Journal of Fluid Mechanics Research, Vol.24, 1997, issue 1-3
K. M. Olson, Douglas Talley, P. A. Strakey
THE EFFECT OF MANIFOLD CROSS-FLOW ON THE DISCHARGE COEFFICIENT OF SHARP-EDGED ORIFICES
Atomization and Sprays, Vol.9, 1999, issue 1
Douglas Talley, P. A. Strakey
MODELING CAVITATING FLOWS IN DIESEL INJECTORS
Atomization and Sprays, Vol.6, 1996, issue 6
Yongliang Chen, Stephen D. Heister