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The laminar burning velocity ( SL ) was measured at sub-atmospheric pressure (0.84 atm) and an environmental temperature of 295 ± 2 K for two high C 2 H 6  content fuel mixtures, 75% CH 4  – 25% C 2 H 6  (mixture M1), and 50% CH 4  – 50% C 2 H 6  (mixture M2), as well as the pure constituent fuels. The equivalence ratios for the experiments ranged between 0.8 and 1.4. Numerical calculations predicting  SL  were performed using 3 detailed reaction mechanisms, finding GRI-Mech 3.0 to achieve the best agreement at the pressure conditions evaluated. The pre-exponential factor of reaction H + O 2  = O + OH (R38) was modified in order to improve the numerical results at sub-atmospheric conditions. Kinetic analysis by means of the defined reaction factor () was carried out to identify the mechanism for  SL  changes at sub-atmospheric conditions. According to the experimental results,  SL  increased by 15.9% and 26.3% for mixtures M1 and M2, respectively, at 0.84 atm as compared to 1.0 atm. The reaction pathways elaborated employing  FR  indicate that the increase in  SL  at sub-atmospheric conditions is caused by increased CH 3  radical production by reaction C 2 H 5  + H = 2CH 3  (R159), which increases the formation of H radical through reactions O + CH 3  = H + CH 2 O (R10) and O + CH 3  = H + H 2  + CO (R284). The recombination reactions associated with the production of CH 4  and C 2 H 6  also contribute to  SL  increases at sub-atmospheric conditions.

Kinetic study of the effect of sub-atmospheric conditions on the laminar burning velocity of high C 2 H 6 content natural gas mixtures