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

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

Luc Vervisch
CORIA - CNRS & INSA Rouen, BP 8, 76801 Saint-Etienne-du-Rouvray, France

Y.-S. Niu
CORIA - CNRS & INSA Rouen, BP 8, 76801 Saint-Etienne-du-Rouvray, France

Guillaume Lodier
CORIA - CNRS & INSA Rouen, BP 8, 76801 Saint-Etienne-du-Rouvray, France

Pascale Domingo
CORIA - CNRS & INSA Rouen, BP 8, 76801 Saint-Etienne-du-Rouvray, France

Sinopsis

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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