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LES of turbulent liquid jet primary breakup in turbulent coaxial air flow

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journal contribution
posted on 2014-04-10, 10:18 authored by Feng Xiao, Mehriar Dianat, Jim McGuirk
A robust two-phase flow Large Eddy Simulation (LES) algorithm has been developed and applied to predict the primary breakup of an axisymmetric water jet injected into a surrounding coaxial air flow. The high liquid/gas density and viscosity ratios are known to represent a significant challenge in numerical modelling of the primary breakup process. In the current LES methodology, an extrapolated liquid velocity field was used to minimise discretisation errors, whilst maintaining sharp treatment of fluid properties across the interface. The proposed numerical approach showed excellent robustness and high accuracy in predicting coaxial liquid jet primary breakup. Since strong turbulence structures will develop inside the injector at high Reynolds numbers and affect the subsequent primary breakup, the Rescaling and Recycling Method (RM) was implemented to facilitate generation of appropriate unsteady LES inlet conditions for both phases. The influence of inflowing liquid and gas turbulent structures on the initial interface instability was investigated. It is shown that liquid turbulent eddies play the dominant role in the initial development of liquid jet surface disturbance and distortion for the flow conditions considered. When turbulent inflows were specified by the RM technique, the predicted core breakup lengths at different air/water velocities agreed closely with experimental data. © 2013 The Authors.

Funding

The work reported here was carried out in the Loughborough UTC in Combustion System Aerothermal Processes. Financial support from EPSRC (SAMULET project and Dorothy Hodgkin Award for the first author) is gratefully acknowledged.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

International Journal of Multiphase Flow

Volume

60

Pages

103 - 118

Citation

XIAO, F., DIANAT, M. and MCGUIRK, J.J., 2014. LES of turbulent liquid jet primary breakup in turbulent coaxial air flow. International Journal of Multiphase Flow, 60, pp. 103 - 118.

Publisher

Elsevier / © The Authors

Version

  • VoR (Version of Record)

Acceptance date

2013-11-28

Publication date

2013-12-08

Notes

This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

ISSN

0301-9322

Language

  • en