Abstract：In order to explore the effects of dust mass concentration, ignition energy, ignition delay time and inert mass fraction on the violence of aluminum dust explosion, the maximum explosion pressure and the maximum rate of pressure rise were conducted with 20 L spherical explosion test device and based on orthogonal experiment. The results show that dust mass concentration has the most significant effect on the maximum explosion pressure and ignition energy has the greatest effect on the maximum rate of pressure rise. Within the experimental concentration range, the maximum explosion pressure and the maximum rate of pressure rise increase with increasing dust concentration and ignition energy and decrease with increasing inert mass fraction. Under the same mass concentration, the maximum explosion pressure decreases linearly with increasing inert mass fration and the maximum rate of pressure rise increases linearly with the increase of ignition energy. Meanwhile, dust mass concentration has both significant effect on the maximum explosion pressure and the maximum rate of pressure rise.

Keywords：aluminum powder; orthogonal experiment; powder explosion; ignition energy; ignition delay time; inert material mass fraction; dust concentration