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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

Recent developments in turbulent combustion modeling: automated progress variables definition − Ignition combustion regimes after rapid compression

pages 37-48
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.40
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摘要

Two recent findings in relation with turbulent combustion modeling are discussed. The first concerns the projection, in a space of low-dimension, of the numerous degrees of freedom pertaining to the description of chemistry of hydrocarbon flames. From an analysis of chemical trajectories observed in canonical flame problems, a set of inequalities is derived and solved to determine the optimal composition-space projection. The second point deals with ignition after rapid compression, the major ignition regimes usually observed (quasi-homogeneous or fragmented) are revisited from Direct Numerical Simulation of a rapid compression machine. The outcome is an ignition diagram to delineate between regimes, this diagram is based on mixing characteristic times and the chemical ignition delay.

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