Measurement on Turbulent Premixed Flame Structure of CH ₄ /H ₂ /Air Mixtures with CO ₂ Dilution

Measurement on turbulent premixed CH₄/H₂/air flames was studied experimentally. Hydrogen blending ratio is defined as the ratio of hydrogen to fuel, while CO₂ dilution ratio is defined as the mole fraction of CO₂ to those of mixture. Hydrogen blending ratios up to 0.2 and CO₂ dilution ratios up to 0.1 were studied. OH profile of the instantaneous flame front was detected using the OH-PLIF visualizations on a turbulent Bunsen burner. 500 OH-PLIF images were used to obtain the turbulent burning velocity and calculate flame surface density, and 280 images was used to calculate the local curvature radius.