Experimental study on turbulent premixed flames of syngas oxyfuel mixtures at high pressure

An experimental study on turbulent premixed CO/H₂/CO₂/O₂ flames as a model of syngas combustion was conducted to understand the flame-turbulence interaction of syngas oxyfuel turbulent premixed flames at high pressure. The instantaneous flame front structure of the turbulent premixed flames at high pressure was obtained with the OH-PLIF technique. The quantitative flame front structure parameters like flame volume, flame surface density and flame front scale were derived. The flame-turbulence interaction was analyzed for various mixtures. The results show that the flame front structure of syngas flames is much finer and has a smaller scale compared with that of CH₄/air flame. The syngas flames with the narrow heat release region tend to show combustion oscillation in the premixed-type gas turbine combustor. The bending of S_T/S_L with u'/S_L is not observed for CO/H₂/CO₂/air flames while it is observed for other flames, and one reason for this could be that the wrinkle of the flame front due to turbulence is limited by the flame intrinsic instability.