Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

Volumes:
Volumen 47, 2020 Volumen 46, 2019 Volumen 45, 2018 Volumen 44, 2017 Volumen 43, 2016 Volumen 42, 2015 Volumen 41, 2014 Volumen 40, 2013 Volumen 39, 2012 Volumen 38, 2011 Volumen 37, 2010 Volumen 36, 2009 Volumen 35, 2008 Volumen 34, 2007 Volumen 33, 2006 Volumen 32, 2005 Volumen 31, 2004 Volumen 30, 2003 Volumen 29, 2002 Volumen 28, 2001 Volumen 27, 2000 Volumen 26, 1999 Volumen 25, 1998 Volumen 24, 1997 Volumen 23, 1996 Volumen 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v24.i4-6.50
pages 488-497

Initial Atomization of an Intermittent Spray from a Diesel Nozzle

Hideo Takahashi
Department of Mechanical Engineering, Gunma College of Technology, Gunma, Japan
M. Kono
Department of Aeronautics & Astronautics, University of Tokyo, Tokyo, Japan
Hiroki Yanagisawa
Mitsubishi Motor Corporation
Siichi Shiga
Monodzukuri Research Organization
Takao Karasawa
Department of Mechanical Engineering, Faculty of Engineering, Gunma University, Gunma, Japan
Hisao Nakamura
Department of Mechanical Engineering, Faculty of Engineering, Gunma University, Gunma, Japan

ABSTRAKT

The purpose of this study is to clarify the atomization mechanisms of an intermittent fuel spray in its very early stage of injection. A single hole diesel nozzle was used in rather wide range of valve opening pressure from 5 to 70 MPa. The measurement of injection pressure inside the nozzle-sac, that is just at the upstream of the orifice, was attempted by using a micro-strain gauge. Two observation apparatuses were used, an image-converting high-speed camera with the framing rate of 105 f.p.s. and an image-intensified CCD camera with high-speed gating. At the very beginning of injection, an emergence of a liquid column was observed, which had almost the same diameter as the orifice. Then the liquid column spread radially, forming a spray angle in the vicinity of the nozzle exit. The timing of the spray angle formation was shown to become earlier with increasing the in valve opening pressure. Furthermore the pressure inside the nozzle-sac at this moment did not vary. This pressure approximately corresponds to that of the transition from a wavy jet to a developed spray in the atomization regime for a steady jet. Thus, it is suggested that the atomization mechanism of a steady jet could be applicable to the unsteady spray formation process. Under several injection conditions, it was observed the formation of a thin thread at the tip of the original spray. It appeared at the very beginning of injection, and developed to the length of 2 or 3 mm. The tip gradually broke up, decreased the velocity, and was finally caught up by the original spray.


Articles with similar content:

STUDY ON BUBBLE BREAKUP BEHAVIOR IN A VENTURI TUBE
Multiphase Science and Technology, Vol.24, 2012, issue 3
Shin-Ichiro Uesawa, Yasumichi Nomura, Yutaka Abe, Akiko Kaneko
RELATION OF SPRAY STRUCTURE AND TURBULENCE OF AIR WITHIN SPRAY EJECTED FROM INTERNAL MIXING TWIN FLUID ATOMIZER OF ORIFICE-TYPE
ICLASS 94
Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems, Vol.0, 1994, issue
D. Q. Zhao, M. Iijima, Takashi Sakai, Masahiro Saito
INVESTIGATION OF RAPID ATOMIZATION AND COLLAPSE OF SUPERHEATED LIQUID FUEL SPRAY UNDER SUPERHEATED CONDITIONS
Atomization and Sprays, Vol.26, 2016, issue 12
Hujie Pan, David L. S. Hung, Tianyun Li, Min Xu, Shengqi Wu
EXPERIMENTAL STUDY ON TRANSCRITICAL SPRAY OF LIQUID AVIATION KEROSENE
Atomization and Sprays, Vol.23, 2013, issue 7
Zhencen Fan, Wei Fan, Le Jin, Haoyi Song
EFFECT OF PERIODIC DISTURBANCES ON NON-NEWTONIAN FLUID SPRAYS
Atomization and Sprays, Vol.18, 2008, issue 8
Benveniste Natan, Victor Chernov