Experimental study of laminar burning velocity for dual fuel (Gasoline-NG)-Air mixture using pressure record in a spherical combustion bomb at higher primary pressure

Turbulent burning velocity of air-fuel mixture depends on laminar burning velocity and turbulent aspects. The main factors influencing laminar burning velocity are fuel type and pressure, temperature and equivalence ratio of the mixture. In the current work, a constant volume spherical bomb and its related equipments were used to capture experimental pressure-time data during combustion period. The data was defined as input to a multi zone thermodynamic code to calculate laminar burning velocity. The velocity was evaluated for gasoline-air and Natural Gas (NG)-air mixtures at stoichiometric equivalence ratio and NG-gasoline-air mixtures with NG mass percentage of 25%, 50% 75% and 100% at stoichiometric condition with initial pressure and temperature of 500kPa and 333K, respectively. The obtained results of gasoline-air mixtures in comparison to NG-air laminar burning velocity showed that the NG-air laminar burning velocity in the range of 5 to 20bar was higher than gasoline. For dual fuel NG-gasoline it was observed that at the stoichiometric condition when bomb pressure was lower than 20bar, the laminar burning velocities of 25% and 50%NG in dual case were lower than those of 100%NG.