RT Journal Article
T1 Diffusion-flame flickering as a hydrodynamic global mode
A1 Moreno Boza, Daniel
A1 Coenen, Wilfried
A1 Sevilla Santiago, Alejandro
A1 J., Carpio
A1 Sánchez, A. L.
A1 Liñán, A.
AB 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.
SN 0022-1120
YR 2016
FD 2016-07-01
LK https://hdl.handle.net/10016/35500
UL https://hdl.handle.net/10016/35500
LA eng
NO Norbert Peters pointed out the need for the present analysis in his seminal paper with John Buckmaster published thirty years ago (Buckmaster & Peters 1986). It is with great sorrow that we received the news of his passing last year. This paper is devoted to his memory in gratitude for his many outstanding contributions to Combustion Science.The constructive comments of one anonymous referee have led to substantial improvements of the paper and are gratefully acknowledged. This work was supported by the Spanish MCINN through project no. CSD2010-00010 and by the Spanish MINECO through project no. DPI2014-59292-C3-1-P.
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RD 1 sept. 2024