Effect of Pressure and Turbulence Intensity on the Heat Flux During Flame Wall Interaction (FWI)

Abstract

Combustion applications such as internal combustion engines are a major source of power generation. Renewable alternative fuels like hydrogen and ammonia promise the potential of combustion in future power applications. Most power applications encounter flame wall interaction (FWI) during which high heat losses occur. Investigating heat loss during FWI has the potential to identify parameters that could lead to decreasing heat losses and possibly increasing the efficiency of combustion applications. In this work, a study of FWI (CH₄-air mixture) in a constant volume chamber, with a head-on quenching configuration, at high pressure in both laminar and turbulent conditions is presented. High-speed surface temperature measurement using thin junction thermocouples coupled with high-speed flow field characterization using particle image velocimetry (PIV) are used simultaneously to investigate the effect of pressure during FWI (P_int) and turbulence intensity (q) on the heat flux peak (Q_P). In laminar combustion regimes, it is found that Q_P is proportional to P_int^0.35. The increase in q is shown to affect both P_int and Q_P. Finally, comparing Q_P versus P_int for both laminar and turbulent combustion regimes, it is found that an increase in q leads to an increase in Q_P (b = 0.76).