Suscripción a Biblioteca: Guest
Portal Digitalde Biblioteca Digital eLibros Revistas Referencias y Libros de Ponencias Colecciones
Atomization and Sprays
Factor de Impacto: 1.262 Factor de Impacto de 5 años: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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

Atomization and Sprays

DOI: 10.1615/AtomizSpr.v16.i5.50
pages 543-562


Chang Sik Lee
School of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea
Rolf D. Reitz
Engine Research Center, University of Wisconsin-Madison, Rm 1018A, 1500 Engineering Drive, Madison, Wisconsin 53706, USA
Sungwook Park
School of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04736, Republic of Korea


This article describes the effects of split injection on the macroscopic behavior and atomization characteristics of a high-speed diesel spray injected through a common-rail system. In order to reveal the effects of the first injection on the second injection under various injection durations, experiments on the injection rate, spray behavior, and drop Sauter mean diameter (SMD) were conducted by using an injection rate meter, a spray visualization system, and a phase Doppler particle analyzer system. The test injector had a single hole with 0.3 mm hole diameter and 0.8 mm nozzle length. In split injections, the sum of the first and second energizing durations was set constant as 1.2 ms, and various split injections were studied. The effect of ambient pressure on the spray development was also investigated by using a high-pressure spray chamber. For the numerical investigations, the KIVA-3 code including a modified nozzle flow model, and a breakup model was applied to the simulation of spray atomization using the same calculation conditions as the experiments. The injection velocity was calculated based on the flow model that considers cavitation in the nozzle and the realistic nozzle geometry. The breakup model, which has a dominant effect in calculating the mean droplet size of the spray, was also modified to include the Kelvin-Helmholtz instability/droplet deformation and breakup (KH-DDB) model. In the KH-DDB model, both wave instability and droplet deformation are considered as the breakup factors upstream of the jet breakup length. On the other hand, beyond the breakup length, only droplet deformation is regarded because the relative velocity between the droplet and the ambient gas is lower in comparison to the velocity above the breakup length. The results show that the effect of interference between injections on the injection pressure is little in comparison to the effect of gas flow. The entrainment of ambient gas by the first injection causes a longer spray tip penetration and larger drop SMD for the second injection in comparison to the case of a single injection.