Experimental and numerical investigation on the effect of hydrogen addition and N2/CO2 dilution on laminar burning velocity of methane/oxygen mixtures. (24th June 2020) - Jithin, E.V.
Abstract: An experimental and numerical study on the combined effect of N2 /CO2 dilution and hydrogen addition on the laminar burning velocity (LBV) of methane-oxygen mixtures was conducted. The experiments were performed at atmospheric conditions using the heat flux method for effective equivalence ratios (ϕF ) varying from 0.7 to 1.3. The results show that the hydrogen addition causes an increase in LBV for all the mixture conditions. The variation in LBV based on hydrogen addition parameter (RH ) for all N2 dilution conditions were following a linearly increasing trend. The strong effect of hydrogen addition on LBV is observed at lean and rich mixtures compared to that at near stoichiometric mixture conditions. The experimental results show that the percentage variation in LBV with RH at rich mixture is more substantial at 75% N2 dilution compared to that at 65% N2 dilution. Highlights: Effect of N2 /CO2 dilution and hydrogen addition on LBV of methane-oxygen mixtures was studied. Mixture diluent approach is used to study the diluent effect by isolating the diluent. Strong effect of hydrogen addition on LBV is observed at lean and rich mixtures. RH effect on LBV is less significant at 75% N2, ϕF = 1. LBV increases linearly with RH for all N2 dilution mixture conditions.