Direct evaluation of the subgrid scale scalar flux in turbulent premixed flames with conditioned dual-plane stereo PIV

2009 ◽  
Vol 32 (2) ◽  
pp. 1723-1730 ◽  
Author(s):  
Sebastian Pfadler ◽  
Johannes Kerl ◽  
Frank Beyrau ◽  
Alfred Leipertz ◽  
Amsini Sadiki ◽  
...  
Keyword(s):  
Premixed Flames ◽  
Subgrid Scale ◽  
Scalar Flux ◽  
Turbulent Premixed Flames ◽  
Direct Evaluation ◽  
Dual Plane ◽  
Turbulent Premixed

Modelling of turbulent scalar flux in turbulent premixed flames based on DNS databases

2006 ◽  
Vol 10 (1) ◽  
pp. 39-55 ◽  
Author(s):  
S. Nishiki ◽  
T. Hasegawa ◽  
R. Borghi ◽  
R. Himeno
Keyword(s):  
Premixed Flames ◽  
Scalar Flux ◽  
Turbulent Premixed Flames ◽  
Turbulent Premixed

scholarly journals Modelling of Conditional Scalar Dissipation Rate in Turbulent Premixed Combustion

Computation ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 26 ◽  
Author(s):  
Shokri Amzin ◽  
Mariusz Domagała
Keyword(s):  
Dissipation Rate ◽  
Premixed Flames ◽  
Moment Closure ◽  
Navier Stokes ◽  
Scalar Dissipation ◽  
Flame Surface ◽  
Scalar Dissipation Rate ◽  
Turbulent Premixed Flames ◽  
Conditional Moment ◽  
Turbulent Premixed

In turbulent premixed flames, for the mixing at a molecular level of reactants and products on the flame surface, it is crucial to sustain the combustion. This mixing phenomenon is featured by the scalar dissipation rate, which may be broadly defined as the rate of micro-mixing at small scales. This term, which appears in many turbulent combustion methods, includes the Conditional Moment Closure (CMC) and the Probability Density Function (PDF), requires an accurate model. In this study, a mathematical closure for the conditional mean scalar dissipation rate, <Nc|ζ>, in Reynolds, Averaged Navier–Stokes (RANS) context is proposed and tested against two different Direct Numerical Simulation (DNS) databases having different thermochemical and turbulence conditions. These databases consist of lean turbulent premixed V-flames of the CH4-air mixture and stoichiometric turbulent premixed flames of H2-air. The mathematical model has successfully predicted the peak and the typical profile of <Nc|ζ> with the sample space ζ and its prediction was consistent with an earlier study.

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