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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110

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

Краткое описание

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.


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