---

Nowadays, due to energy crisis and the increase in the energy demand, the use of alternative fuels is essential. Landfill gas (LFG) is a natural product of the decomposition of organic material in landfills which is composed of methane and carbon dioxide. Impinging flames are unique configuration which leads to an increase in the amount of mixing and improving combustion efficiency. In this study, temperature field and flame structure of laminar premixed flame of landfill-air in cross burners have been examined. The flame temperature field of combustion products was obtained by the Mach-Zehnder interferometry method. To validate the results, the obtained temperatures of Mach-Zehnder method were compared to measured data by thermocouples and good agreement was observed. The effects of angle and distance between two burners have been studied to investigate the effect of burner’s configuration on the flame structure. These two parameters in laminar flow regime have been studied, while the angle between two burners varied from 60 to 100 degree and dimensionless distance (S⁄D_h ) varied from 3.44 to 9.63. The obtained results showed the burner’s angle does not have much impact on the maximum flame temperature but the flame structure is very affected by this parameter. On the other hand, the distance between burners has strong effect on the maximum flame temperature, flame structure, and the region of maximum flame temperature.