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THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium On Turbulence Heat and Mass Transfer
July, 10-13, 2018, Rio de Janeiro, Brazil

DOI: 10.1615/THMT-18


ISBN Print: 978-1-56700-468-7

ISBN Online: 978-1-56700-467-0

ISSN Print: 2377-2816

Flame Structure of Supercritical CH4/CO2/O2 Non-Premixed Turbulent Oxy-Combustion by Means of Large Eddy Simulation

pages 1025-1036
DOI: 10.1615/THMT-18.1150
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RÉSUMÉ

The aim of this work is to investigate turbulent non-premixed methane oxy-combustion in an atmosphere rich in CO2 at supercritical conditions by means of Large Eddy Simulation. A simple shear-layer configuration typical of slot burners is considered: the fuel is CH4 and flows through the central slot, the oxidant O2/CO2 (90% O2 by mass) mixture flows on both sides of the slot, and a pilot flame is imposed at the inlet between the two streams of reactants to force ignition. Fully compressible Navier-Stokes equations coupled to the Peng-Robinson cubic equation of state for real gases in its improved translated volume formulation are solved adopting the Large Eddy Simulation approach. The dynamic Smagorinsky and the LTSM subgrid scale models are used for turbulence and combustion closures. Among the diffusive mechanisms only the Dufour effect is neglected; transport properties are accurately calculated. The M1 radiant transfer of energy model is adopted without considering turbulence-radiation interactions. Numerical results are examined to highlight different physical aspects of the flow: the effect of oxygen stream dilution on the flame anchoring and topology; the effect of the radiant transfer of energy on the flame structure; diffusive mechanisms, to identify the fastest processes through the comparison of characteristic times.

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