Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110

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

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v39.i1.20
pages 20-39

Modelling of Coaxial Jet Efflux Mixing using LES

K. K. J. Ranga Dinesh
School of Engineering, Cranfield University, Cranfield; Engineering Department, Lancaster University Lancaster, LA1 4YR, UK
A. M. Savill
School of Engineering, Cranfield University, Bedford MK43 0AL, UK
K. P. Garry
School of Engineering, Cranfield University Cranfield, MK43 0AL, UK
J. C. Holt
School of Engineering, Cranfield University Cranfield, MK43 0AL, UK
D. I. A. Poll
School of Engineering, Cranfield University Cranfield, MK43 0AL, UK
Michael P. Kirkpatrick
School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia

RÉSUMÉ

A detailed study has been performed to investigate passive scalar mixing of turbulent co-flowing jets in their initial exhaust development region, as a complement to separate experimental studies, to provide better defined initial conditions for subsequent simpler model predictions of the effect of aircraft engine plume/vortex interactions on air quality. Accordingly a well-established Large Eddy Simulation (LES) technique has first been validated against experimental data for a low-speed turbulent round jet and then used to perform a parametric series of simulations, numerical experiments, for a coaxial jet representative of a modern, large by-pass ratio jet engine exhaust under a variety of conditions with passive scalar introduced into either the core or bypass flow. Effects of free-stream velocity, swirl, and boundary proximity have all been considered and conclusions drawn. The comparisons between LES data and experiment measurements were in good agreement for low-velocity round jet. For a higher-velocity coaxial jet, initial instabilities on the shear boundary between the core and by-pass flows were seen to quickly develop into large scale coherent (vortex) motions which grew in scale and lost energy to a broader range of motions at downstream. The numerical databases generated for this series of coaxial jet configurations provide a valuable source of information for more accurately initialising lower order modelling of subsequent jet efflux development and vortex interaction.


Articles with similar content:

DNS OF TURBULENT JETS ISSUING FROM ACOUSTICALLY LINED PIPES AT DIFFERENT MACH NUMBERS
TSFP DIGITAL LIBRARY ONLINE, Vol.9, 2015, issue
Richard D. Sandberg, Brian J. Tester
PURE LAGRANGIAN VORTEX METHODS FOR THE SIMULATION OF DECAYING ISOTROPIC TURBULENCE
TSFP DIGITAL LIBRARY ONLINE, Vol.5, 2007, issue
Shinnosuke Obi, Rio Yokota
LARGE EDDY SIMULATION OF ENCLOSED ROTOR-STATOR FLOW
TSFP DIGITAL LIBRARY ONLINE, Vol.3, 2003, issue
Chao-An Lin, Wei Lo, C. W. Chen
NUMERICAL ANALYSIS OF A TURBULENT REACTING FLAME USING COMPREHENSIVE MODELING APPROACHES: RANS, LES AND HYBRID RANS-LES
4th Thermal and Fluids Engineering Conference, Vol.5, 2019, issue
Wayne Strasser, Francine Battaglia, Lu Chen
Enhanced Delayed DES of shock wave/boundary layer interaction in a planar transonic nozzle
ICHMT DIGITAL LIBRARY ONLINE, Vol.0, 2018, issue
P.P. Ciottoli, Fulvio Stella, E. Martelli, G. Della Posta, Matteo Bernardini