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Analysis of the flame–wall interaction in premixed turbulent combustion

Published online by Cambridge University Press:  01 June 2018

Peipei Zhao
Affiliation:
UM-SJTU Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China
Lipo Wang*
Affiliation:
UM-SJTU Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China
Nilanjan Chakraborty
Affiliation:
School of Engineering, Newcastle University, Newcastle-Upon-TyneNE1 7RU, UK
*
Email address for correspondence: [email protected]

Abstract

The present work focuses on the flame–wall interaction (FWI) based on direct numerical simulations (DNS) of a head-on premixed flame quenching configuration at the statistically stationary state. The effects of FWI on the turbulent flame temperature, wall heat flux, flame dynamics and flow structures were investigated. In turbulent head-on quenching, particularly for high turbulence intensity, the distorted flames generally consist of the head-on flame part and the entrained flame part. The flame properties are jointly influenced by turbulence, heat generation from chemical reactions and heat loss to the cold wall boundary. For the present FWI configuration, as the wall is approached, the ‘influence zone’ can be identified as the region within which the flame temperature, scalar gradient and flame dilatation start to decrease, whereas the wall heat flux tends to increase. As the distance to the wall drops below the flame-quenching distance, approximately where the wall heat flux reaches its maximum value, chemical reactions become negligibly weak inside the ‘quenching zone’. A simplified counter-flow model is also proposed. With the reasonably proposed relation between the flame speed and the flame temperature, the model solutions match well with the DNS results, both qualitatively and quantitatively. Moreover, near-wall statistics of some important flame properties, including the flame dilatation, reaction progress variable gradient, tangential strain rate and curvature were analysed in detail under different wall boundary conditions.

Type
JFM Papers
Copyright
© 2018 Cambridge University Press 

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