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Flame front/turbulence interaction for syngas fuels in the thin reaction zones regime: turbulent and stretched laminar flame speeds at elevated pressures and temperatures

Published online by Cambridge University Press:  29 April 2013

S. Daniele ,
J. Mantzaras ,
P. Jansohn ,
A. Denisov  and
K. Boulouchos
S. Daniele*
Affiliation:
Paul Scherrer Institute (PSI), Combustion Research Laboratory, CH-5232 Villigen PSI, Switzerland
J. Mantzaras
Affiliation:
Paul Scherrer Institute (PSI), Combustion Research Laboratory, CH-5232 Villigen PSI, Switzerland
P. Jansohn
Affiliation:
Paul Scherrer Institute (PSI), Combustion Research Laboratory, CH-5232 Villigen PSI, Switzerland
A. Denisov
Affiliation:
Paul Scherrer Institute (PSI), Combustion Research Laboratory, CH-5232 Villigen PSI, Switzerland
K. Boulouchos
Affiliation:
Swiss Federal Institute of Technology (ETH) Aerothermochemistry and Combustion Systems Laboratory, Sonneggstrasse 3, CH-8092 Zürich, Switzerland
*
†Email address for correspondence: salvatore.daniele@fhnw.ch
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Abstract

Experiments were performed in dump-stabilized axisymmetric flames to assess turbulent flame speeds ( ${S}_{T} $ ) and mean flamelets speeds (stretched laminar flame speeds, ${S}_{L, k} $ ). Fuels with significantly different thermodiffusive properties have been investigated, ranging from pure methane to syngas ( ${\mathrm{H} }_{2} \text{{\ndash}} \mathrm{CO} $ blends) and pure hydrogen, while the pressure was varied from 0.1 to 1.25 MPa. Flame front corrugation was measured with planar laser-induced fluorescence (PLIF) of the OH radical, while turbulence quantities were determined with particle image velocimetry (PIV). Two different analyses based on mass balance were performed on the acquired flame images. The first method assessed absolute values of turbulent flame speeds and the second method, by means of an improved fractal methodology, provided normalized turbulent flame speeds ( ${S}_{T} / {S}_{L, k} $ ). Deduced average Markstein numbers exhibited a strong dependence on pressure and hydrogen content of the reactive mixture. It was shown that preferential-diffusive-thermal (PDT) effects acted primarily on enhancing the stretched laminar flame speeds rather than on increasing the flame front corrugations. Interaction between flame front and turbulent eddies measured by the fractal dimension was shown to correlate with the eddy temporal activity.

JFM classification

Reacting Flows: Flames Reacting Flows: Reacting Flows Reacting Flows: Turbulent reacting flows

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 724 , 10 June 2013 , pp. 36 - 68
Copyright
©2013 Cambridge University Press 

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