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

Volumes:
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.2012004610
pages 57-77

OPTIMIZATION OF BREAKUP MODEL USING LES OF DIESEL SPRAY

Koji Kitaguchi
Department of Mechanical Engineering, Doshisha University, Japan
Soichi Hatori
Department of Mechanical Engineering, Doshisha University, Japan
Tsukasa Hori
Department of Mechanical Engineering, Osaka University, Japan
Jiro Senda
Department of Mechanical Engineering, Doshisha University, Kyoto, Japan

SINOPSIS

In this study, an application of an original combined spray breakup model is proposed to simulate the transmit diesel spray feature by use of large eddy simulation (LES) analysis. The spray model is combined with the Kelvin−Helmholtz (KH) and Rayleigh−Taylor (RT) model (i.e., the KHRT model), which is a combination of the surface wave instability (WAVE) model, RT model, and modified Taylor analogy breakup (MTAB) model. Here, the spatial heterogeneous structure inside the spray is focused to assess the dispersion and mixing processes by applying an accurate spray breakup model. It is well known that the KHRT model can properly estimate the spray shape by underestimating the Sauter mean diameter (SMD) of the droplet within the spray, while the MTAB model can predict the SMD adequately by overestimating the parcel diffusion at the upper stream region of the spray. The KHRT model is based on the breakup regime of a higher droplet Weber number. The MTAB model is based on the breakup regime of a comparatively lower Weber number. In diesel sprays, high Weber number droplets can be observed at the upper spray region and low Weber number droplets can be observed downstream from the spray due to the momentum exchange between the liquid and gas phases. In this study, a breakup model was developed in order to improve the prediction accuracy of non-evaporating diesel spray. For analysis of the primary breakup regime, the WAVE model is employed in the higher droplet Weber number region and for the secondary breakup, the MTAB model is introduced into the lower Weber number region. This model is applied at different fuel injection pressures in order to validate the WAVE-MTAB model. As a result, the effect of the fuel injection pressure was successfully predicted by this WAVE-MTAB model.