Numerical and Analytical Assessment of Finite Rate Chemistry Models for LES of Turbulent Premixed Flames

• Published in: Flow, turbulence and combustion Vol. 109; no. 2; pp. 435 - 458
• Main Authors: Liu, Haochen, Yin, Zifei, Xie, Wenwen, Zhang, Bin, Le, Jialing, Liu, Hong
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-08-2022; Springer Nature B.V
• Subjects: Automotive Engineering; Combustion; Direct numerical simulation; Engineering; Engineering Fluid Dynamics; Engineering Thermodynamics; Fluid flow; Fluid- and Aerodynamics; Heat and Mass Transfer; Large eddy simulation; Mathematical models; Premixed flames; Reynolds number; Turbulent flames; Turbulent flow; Vortices; Finite rate chemistry; Direct numerical simulation; Large Eddy simulation; Premixed turbulent combustion
• ISSN: 1386-6184; 1573-1987
• DOI: 10.1007/s10494-022-00329-7

Different combustion models for large eddy simulation, including the quasi-laminar (QL), Eddy dissipation concept (EDC), and partially stirred reactor (PaSR) models, are assessed at various filter widths using direct numerical simulation (DNS). The DNS database is lean hydrogen-air turbulent flame across a wide range of Karlovitz numbers (5–239). Overall, the PaSR model performs best, except for small filter width and medium Karlovitz number conditions. The performance of the EDC model is very similar to the QL model at a relatively low turbulent Reynolds number. It is highlighted that both the EDC and PaSR models are suitable for high turbulent Reynolds number and medium Karlovitz number conditions. Theoretical analysis is carried out to explain the current observations and predict the models’ behaviors with the variation of turbulent intensity, combustion intensity, and grid resolution. Implications of the present results for modeling are highlighted.