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Enstrophy transport in swirl combustion

Published online by Cambridge University Press:  06 August 2019

Askar Kazbekov Open the ORCID record for Askar Kazbekov [Opens in a new window] ,
Keishi Kumashiro Open the ORCID record for Keishi Kumashiro [Opens in a new window]  and
Adam M. Steinberg Open the ORCID record for Adam M. Steinberg [Opens in a new window]
Askar Kazbekov
Affiliation:
Institute for Aerospace Studies, University of Toronto, Toronto M3H 5T6, Canada
Keishi Kumashiro
Affiliation:
Institute for Aerospace Studies, University of Toronto, Toronto M3H 5T6, Canada
Adam M. Steinberg*
Affiliation:
Institute for Aerospace Studies, University of Toronto, Toronto M3H 5T6, Canada Daniel Guggenheim School of Aerospace Engineering, Georgia Institute of Technology, Atlanta 30332, USA
*
†Email address for correspondence: adam.steinberg@gatech.edu
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Abstract

The contributions of vortex stretching, dilatation, baroclinic torque and viscous diffusion to Reynolds-averaged enstrophy transport in turbulent swirl flames were experimentally measured using tomographic particle image velocimetry and $\text{CH}_{2}\text{O}$ planar laser induced fluorescence at jet Reynolds numbers of 26 000–51 000. The mean baroclinic torque was determined by subtracting the other terms in the enstrophy transport equation from the mean Lagrangian derivative. Enstrophy production from baroclinic torque was found to be significant relative to the other transport terms across all conditions studies. This result contrasts with direct numerical simulations of flames in homogeneous isotropic turbulence, which show a decreasing relative significance of baroclinic torque with increasing turbulence intensity (e.g. Bobbitt, Lapointe & Blanquart, Phys. Fluids, vol. 28 (1), 2016, 015101). Hence, the significance of baroclinic enstrophy production in flames is not determined entirely by the local turbulence and flame properties, but also depends on the configuration-specific pressure field.

JFM classification

Reacting Flows: Turbulent reacting flows Reacting Flows: Flames Vortex Flows: Vortex dynamics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 876 , 10 October 2019 , pp. 715 - 732
Copyright
© 2019 Cambridge University Press 

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