DC magnetic fields influence on quenching and elongating kerosene diffusion flame is experimentally studied by different magnetic fields. The results show that magnetic field promotes the combustion and cause to different variations in the flame front area and height. Applying magnetic field cause to decrease flame front area especially for the flame position below the magnets center line. Also, the flame height decreases below the magnets center line. For the flame above the magnets center line, decreasing product of the magnetic induction and its gradient cause to elongate the flame and then the flame height and front area decrease. These results clarify the effect of a sharp magnetic field on flame volume and height. Therefore, applying magnetic field can be considered as a flame controller.

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