Initial research for the influence of magnetic field on the combustion processes of PMMA

In order to study the combustion characteristics of solid fuels in a gradient magnetic field, the experimental and numerical investigations of the natural convective combustion process of columnar PMMA under gradient magnetic field were conducted. In the experiment, a gradient magnetic field was generated by an electromagnet. At the same time, the flame shape and flow field were recorded by a COMS camera in conjunction with a schlieren device. The regression rate of the solid fuel surface was measured by a servo system. The flame temperature was measured by a B-type platinum-ruthenium thermocouple. The experimental results show that the flame shape changes, the maximum temperature of the flame increases by more than 100K, and the regression rate of the solid fuel surface increases by 10.9% to 19.6% under the influence of the gradient magnetic field. In the numerical calculation, the three-dimensional model of columnar PMMA combustion process under gradient magnetic field was built. The flame shape, magnetic force of each species, flame temperature distribution, solid fuel burning surface temperature, and regression rate of the solid fuel surface were analyzed and compared. The calculation results show that the magnetic field mainly act on O2 and the magnitude is in the order of 10N/m3. And the regression rate of the solid fuel surface increases by 17.01%, which is in good agreement with the experimental results.