Strain rate and flame orientation statistics in the near-wall region for turbulent flame-wall interaction

Abstract

Flame–wall interaction (FWI) in premixed turbulent combustion has been analysed based on a counter-flow like configuration at the statistically stationary state. For the present configuration, the two FWI sub-zones, i.e the influence zone and the quenching zone, can be identified from the DNS results. Detailed analysis of the important quantities, such as the flame temperature, flame–wall distance, wall heat flux, flame curvature and dilatation (including the flame normal and tangential strain rates), and some orientation relations between the flame normal and the principal strain rate directions, have been reported, together with the physical explanations. All these statistical results are determined by the relative strengths of the wall heat flux, thermal expansion and the flame–turbulence interaction.

Keywords:

• flame–wall interaction
• premixed turbulent combustion
• strain rate
• wall heat flux

Acknowledgements

The computational support from the Center for High Performance Computing at Shanghai Jiao Tong University is gratefully appreciated. NC acknowledges the computational support of ARCHER.

Additional information

Funding

LW received financial support from the National Science Foundation of China (NSFC) joint research project [number 11611130099], NSFC China, and PRC 2016-2018 LATUMAR “Turbulence lagrangienne: études numériques et applications environnementales marines”, Centre National de la Researche Scientifique (CNRS), France). NC acknowledges the financial support of the Engineering and Physical Sciences Research Council (EPSRC) (grant numbers: EP/K025163/1, EP/P022286/1), grant number 91441116, and the Sino-French (NSFC-CNRS) initiatives.