Effect of pressure and turbulence intensity on the heat flux during flame wall interaction (FWI)

Abstract

Combustion applications such as IC engines are a major source of power generation. Renewable alternative fuels like hydrogen, ammonia and efuels promise 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 potential to identify parameters that could lead to decreasing heat losses and possibly increasing the efficiency of combustion applications. In this work, study of FWI in a constant volume chamber (CVC) 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 (Pint) and turbulence intensity (q) on the heat flux peak (QP). In laminar combustion regimes it is found that QP is proportional to Pint0.35. The increase in q is shown to affect both Pint and QP. Finally, comparing QP vs Pint for both laminar and turbulent combustion regimes, it is found that increase in q leads to increase in QP which is highly pronounced at high Pint.