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Diffusion-flame flickering as a hydrodynamic global mode

Published online by Cambridge University Press:  15 June 2016

D. Moreno-Boza ,
W. Coenen ,
A. Sevilla ,
J. Carpio ,
A. L. Sánchez  and
A. Liñán
D. Moreno-Boza*
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA 92093–0411, USA
W. Coenen
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA 92093–0411, USA
A. Sevilla
Affiliation:
Departamento de Ingeniería Térmica y de Fluidos, Universidad Carlos III de Madrid, 28911 Leganés, Spain
J. Carpio
Affiliation:
ETSI Industriales, Universidad Politécnica de Madrid, 28006 Madrid, Spain
A. L. Sánchez
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA 92093–0411, USA
A. Liñán
Affiliation:
ETSI Aeronáuticos, Universidad Politécnica de Madrid, 28006 Madrid, Spain
*
†Email address for correspondence: dmorenob@eng.ucsd.edu
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Abstract

The present study employs a linear global stability analysis to investigate buoyancy-induced flickering of axisymmetric laminar jet diffusion flames as a hydrodynamic global mode. The instability-driving interactions of the buoyancy force with the density differences induced by the chemical heat release are described in the infinitely fast reaction limit for unity Lewis numbers of the reactants. The analysis determines the critical conditions at the onset of the linear global instability as well as the Strouhal number of the associated oscillations in terms of the governing parameters of the problem. Marginal instability boundaries are delineated in the Froude number/Reynolds number plane for different fuel jet dilutions. The results of the global stability analysis are compared with direct numerical simulations of time-dependent axisymmetric jet flames and also with results of a local spatio-temporal stability analysis.

JFM classification

Convection: Buoyancy-driven instability Reacting Flows: Flames Reacting Flows: Laminar reacting flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 798 , 10 July 2016 , pp. 997 - 1014
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Copyright
© Cambridge University Press 2016. This is a work of the U.S. Government and is not subject to copyright protection in the United States. 

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