Library Subscription: Guest
Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections
Atomization and Sprays
IF: 1.189 5-Year IF: 1.596 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Print: 1044-5110
ISSN Online: 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.2013008340
pages 841-860

X-RAY RADIOGRAPHY MEASUREMENTS OF CAVITATING NOZZLE FLOW

Daniel Duke
Argonne National Laboratory
Alan L. Kastengren
Energy Systems Division, X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, IL, USA
F. Zak Tilocco
Energy Systems Division, Argonne National Laboratory, Argonne, Illinois 60439 USA
Andrew B. Swantek
Energy Systems Division, Argonne National Laboratory, Argonne, Illinois 60439 USA
Christopher F. Powell
Energy Systems Division, Argonne National Laboratory, Argonne, Illinois 60439 USA

ABSTRACT

Cavitation plays an important role in the formation of sprays from small nozzles such as those found in fuel injection systems. However, cavitation occurs over very short time and length scales, and is difficult to measure in situ. Precise experimental measurements of cavitation vapor distributions in three-dimensional nozzle geometries are valuable tools for the improvement and validation of numerical simulations. The primary quantity of interest is void fraction or local density, which is difficult to measure using visible light diagnostics. X-rays have been used to make precise measurements of the projected mass distribution of sprays, and these same techniques can be extended to cavitating flows. In this paper, we present the preliminary results of an x-ray radiography experiment on a model nozzle of 500 µm diameter. The advantages of a focused x-ray raster scanning method over traditional flat-field x-ray imaging are demonstrated. The raster scan radiography experiments achieve a spatial resolution of 5 µm and a temporal resolution of 3.6 µs. The vapor distributions are found to be very steady; time-resolved measurements indicate that rms fluctuations are not more than 1% of the mean. The spectral content of cavitation is concentrated at small Strouhal numbers on the order of 0.001 to 0.1, suggesting a steady cavitation inception and mixing process without any large-scale fluctuations. Substantial void regions at the nozzle centerline where cavitation is not expected to occur have been investigated, and may be due to dissolved gas in the fuel coming out of solution as the static pressure drops. We propose that dissolved gas is an important variable to consider in fuel spray experiments.


Articles with similar content:

MULTIDIMENSIONAL SIMULATION OF CAVITATING FLOWS IN DIESEL INJECTORS BY A HOMOGENEOUS MIXTURE MODELING APPROACH
Atomization and Sprays, Vol.18, 2008, issue 2
Olivier Simonin, Chawki Habchi, Nicolas Dumont

EXPERIMENTAL STUDY ON SPRAY ANGLE AND VELOCITY DISTRIBUTION OF DIESEL SPRAY UNDER HIGH AMBIENT PRESSURE CONDITIONS
Atomization and Sprays, Vol.21, 2011, issue 12
Masataka Arai, Yoshio Zama, Wataru Ochiai, Tomohiko Furuhata

SPRAY CHARACTERISTICS OF DIESEL FUEL CONTAINING DISSOLVED CO2
Atomization and Sprays, Vol.21, 2011, issue 11
Eran Sher, M. Karaeen

UNCERTAINTY QUANTIFICATION FOR LIQUID PENETRATION OF EVAPORATING SPRAYS AT DIESEL-LIKE CONDITIONS
Atomization and Sprays, Vol.25, 2015, issue 5
Caroline L. Genzale, Lyle M. Pickett, Julien Manin

AREA VOID FRACTION ASSOCIATED WITH TWIN-FLUID ATOMIZER
Atomization and Sprays, Vol.23, 2013, issue 8
E. Vignesh, K. Balaji, R. Aravind, Vayalakkara Sivadas, I. Krishna Raj