عنوان مقاله [English]
In this paper, the effect of the magnetic field with decreasing and increasing gradients on the non-premixed methane flame has been investigated. To examine the impact of the magnetic field, Arrhenius combustion model and the one-stage methane-air mechanism have been used for simulation. The simulated results of the flame temperature are in a good agreement with experimental measurements. Results show the flame deformation and its temperature increase is affected by the magnetic field gradient. By applying the flame in the magnetic field with decreasing and increasing gradients, the flame temperature increases, and the flame height decrease. By using a decreasing gradient magnetic field, the maximum temperature at the top of the burner reaches a height of 4.5 mm and in the absence of field, position at the height of 2.5 mm. While under the influence of increasing gradient magnetic field, this value is 4 mm, indicating a decrease in the height of the flame. These changes are more evident in the area with a decreasing gradient. The magnetic field effects on methane and combustion products mass fraction's decrease. In decreasing and increasing gradients, unburned methane declined respectively 99% and 52% in comparison with no field.