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Finite Rate Chemistry Effects in Highly Sheared Turbulent Premixed Flames

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Abstract

Detailed scalar structure measurements of highly sheared turbulent premixed flames stabilized on the piloted premixed jet burner (PPJB) are reported together with corresponding numerical calculations using a particle based probability density function (PDF) method. The PPJB is capable of stabilizing highly turbulent premixed jet flames through the use of a small stoichiometric pilot that ensures initial ignition of the jet and a large shielding coflow of hot combustion products. Four lean premixed methane-air flames with a constant jet equivalence ratio are studied over a wide range of jet velocities. The scalar structure of the flames are examined through high resolution imaging of temperature and OH mole fraction, whilst the reaction rate structure is examined using simultaneous imaging of temperature and mole fractions of OH and CH2O. Measurements of temperature and mole fractions of CO and OH using the Raman–Rayleigh–LIF-crossed plane OH technique are used to examine the flame thickening and flame reaction rates. It is found that as the shear rates increase, finite-rate chemistry effects manifest through a gradual decrease in reactedness, rather than the abrupt localized extinction observed in non-premixed flames when approaching blow-off. This gradual decrease in reactedness is accompanied by a broadening in the reaction zone which is consistent with the view that turbulence structures become embedded within the instantaneous flame front. Numerical predictions using a particle-based PDF model are shown to be able to predict the measured flames with significant finite-rate chemistry effects, albeit with the use of a modified mixing frequency.

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Authors and Affiliations

  1. School of Aeronautical, Mechanical and Mechatronic Engineering, The University of Sydney, NSW, 2006, Australia

    Matthew J. Dunn, Assaad R. Masri & Robert W. Bilger

  2. Combustion Research Facility, Sandia National Laboratories, 7011 East Avenue, MS 9051, Livermore, CA, 94551-0969, USA

    Matthew J. Dunn & Robert S. Barlow

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  1. Matthew J. Dunn
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  2. Assaad R. Masri
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  3. Robert W. Bilger
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  4. Robert S. Barlow
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Correspondence to Matthew J. Dunn.

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Submitted to the Special Issue of Flow, Turbulence and Combustion dedicated to S.B. Pope.

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Dunn, M.J., Masri, A.R., Bilger, R.W. et al. Finite Rate Chemistry Effects in Highly Sheared Turbulent Premixed Flames. Flow Turbulence Combust 85, 621–648 (2010). https://doi.org/10.1007/s10494-010-9280-5

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