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: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

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

Volumes:
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.2017014123
pages 531-557

AN IMPROVED ENTRAINMENT RATE MEASUREMENT METHOD FOR TRANSIENT JETS FROM 10 KHZ PARTICLE IMAGE VELOCIMETRY

W. Ethan Eagle
Wayne State University, Detroit, Michigan 48202, USA
Mark P. B. Musculus
Sandia National Laboratories, Livermore, California 94550, USA
Louis Marie C. Malbec
IFP Énergies nouvelles (IFPEN), 1-4 av. Bois Preau, 92852 Rueil-Malmaison, France
Gilles Bruneaux
IFP Énergies nouvelles (IFPEN), 1-4 av. Bois Preau, 92852 Rueil-Malmaison, France

RESUMO

One strategy to reduce soot formation in compression–ignition engines is extending the ignition delay to provide more time for mixing. However, vapor–fuel concentration measurements have shown that near-injector mixtures become too lean to achieve complete combustion, leading to a relative increase in unburned hydrocarbon emissions. One potential contributor to over-leaning is an "entrainment wave," which is a transient increase in local entrainment after the end of injection. Although an entrainment wave can be predicted by a one-dimensional (1D) free-jet model, no previous measurements at diesel injection conditions have demonstrated conclusively its existence, nor has its magnitude been verified. Using particle image velocimetry (PIV) in the ambient gases, we measure entrained gas velocity through a diesel jet boundary before, during, and after the injection. The entrainment calculation depends on the definition of the jet boundary, here newly proposed based on the minimum of the radial coordinate and the radial velocity (r). Unlike previous formulations, the method is robust even in the presence of axial flow gradients in the ambient gases. Prior to the end of injection, the measured entrainment rates that agree well with non-reacting steady gas-jet behavior, as well as with the 1D free-jet model. After end of injection, the local entrainment rate temporarily increases by a factor of 2, which is similar to the factor 2.5 increase predicted by the 1D model. However, the entrainment wave is more broadly distributed in the experimental data, likely due to confinement and/or other real-jet processes absent in the 1D model.


Articles with similar content:

EXPERIMENTAL INVESTIGATION ON SELF-SUSTAINED CO-FLOW LAMINAR DIFFUSION FLAMES OF MONODISPERSE SPRAYS DOME
ICLASS 94
Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems, Vol.0, 1994, issue
Alessandro Gomez, G. Chen
DIESEL SPRAY BEHAVIOR AT COMPRESSION RATIOS UP TO 100:1
Atomization and Sprays, Vol.20, 2010, issue 5
S. L. Miller, Matt N. Svrcek, Christopher F. Edwards
DEVELOPMENT OF AN IMPROVED SPRAY/WALL INTERACTION MODEL FOR DIESEL-LIKE SPRAY IMPINGEMENT SIMULATIONS
Atomization and Sprays, Vol.25, 2015, issue 7
Rolf D. Reitz, Qi Jiao, Peng Deng, Zhiyu Han
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
NUMERICAL SIMULATION OF HEAT TRANSFER OF A SPHERICAL PARTICLE IN AN AIR STREAM
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2012, issue
Bendiks Jan Boersma, Nafiseh Talebanfard