Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Atomization and Sprays
Facteur d'impact: 1.262 Facteur d'impact sur 5 ans: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 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.2015011058
pages 375-396

MORPHOLOGICAL EXPLORATION OF EMERGING JET FLOWS FROM MULTI-HOLE DIESEL INJECTORS AT DIFFERENT NEEDLE LIFTS

Seoksu Moon
AIST, Japan
Xusheng Zhang
Advanced Photon Source, Argonne National Laboratory, Argonne, USA; Merchant Marine College, Shanghai Maritime University, Shanghai, China
Jian Gao
Advanced Photon Source, Argonne National Laboratory, Argonne, USA; Propulsion Systems Research Lab., General Motors Global Research and Development, Warren, USA
Kamel Fezzaa
Advanced Photon Source, Argonne National Laboratory, Argonne, USA
Eric M. Dufresne
Advanced Photon Source, Argonne National Laboratory, Argonne, USA
Jin Wang
Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA
Xingbin Xie
Department of Mechanical Engineering, Wayne State University, Detroit, USA
Fengkun Wang
Department of Mechanical Engineering, Wayne State University, Detroit, USA
Ming Chia Lai
Department of Mechanical Engineering, Wayne State University, Detroit, MI 48202

RÉSUMÉ

The current study takes a morphological approach to interpret the emerging jet flows from multi-hole diesel injectors. Several types of multi-hole injectors, a six-hole injector and two two-hole injectors with different needle control mechanisms, were used to investigate the emerging jet flows and related flow breakup at different needle lifts. A short X-ray pulse with 150 ps duration was used to visualize the nearfield morphologies of the emerging jet flows using an ultrafast X-ray phase-contrast imaging technique. A few X-ray pulses with 68 ns periodicity were also used to analyze the dynamics of the emerging jet flows by tracking the movement of the structures inside the spray. At first, the effects of needle lift on emerging flow pattern and breakup were investigated using a six-hole injector under practical injection conditions. A highly expanding spray was observed at the low needle lifts. The degree of flow expansion was however suppressed with an increase in the needle lift. The higher degree of flow expansion at the low needle lifts promoted the flow breakup and increased the spray deceleration rate with an increase in the axial distance. Then, a detailed morphological study of the emerging flows was performed using two-hole nozzles under low injection pressures to slow down the flow breakup in order to figure out the intrinsic nature of the emerging flows associated with the nozzle internal flow. The phase-contrast images revealed clear morphologies of several branching flows inside the spray having different flowing directions and stretching the spray three-dimensionally that originate from complex nozzle internal flow pattern. The degree of flow expansion associated with the branching flows appeared differently with the needle lift with formation of various flow structures: cone shaped, stretched thin, and cylindrical. At certain needle lifts, the branching flows sometimes formed a couple of microwavelets inside the spray having different instability frequencies, indicating different origins of each flow associated with nozzle internal flow. Increasing ambient gas density did not alter the branching characteristics of the flows significantly, while increasing injection pressure and reducing the fuel viscosity significantly altered the branching flow characteristics.


Articles with similar content:

Characterization of Cavitation Flow in a Simple Hole Nozzle
International Journal of Fluid Mechanics Research, Vol.24, 1997, issue 1-3
Keiya Nishida, Steven L. Ceccio, Hiroyuki Hiroyasu, Dennis N. Assanis, N. Tamaki
EFFECTS OF ASYMMETRIC INFLOW ON CAVITATION IN FUEL INJECTOR AND DISCHARGED LIQUID JET
Atomization and Sprays, Vol.26, 2016, issue 9
Akira Sou, Raditya Hendra Pratama
THE INTERNAL FLOW AND EXIT CONDITIONS OF PRESSURE SWIRL ATOMIZERS
Atomization and Sprays, Vol.10, 2000, issue 2
J. J. Chinn
AN EXPERIMENTAL STUDY ON SPRAY TRANSIENT CHARACTERISTICS IN FUEL CONTAINING CO2
Atomization and Sprays, Vol.19, 2009, issue 4
Zhen Huang, Qiao Xinqi, Ma Junjun, Jin Xiao
COMPARATIVE STUDY OF TWIN-FLUID ATOMIZATION USING SONIC OR SUPERSONIC GAS JETS
Atomization and Sprays, Vol.6, 1996, issue 3
Joon Sik Lee, Byung Kyu Park, Kenneth D. Kihm