In order to improve the combustion efficiency of powdered rocket motor

the effects of spoiler ring’s existence

flowing diameter and position on the combustion and flow characteristics in the chamber were studied by numerical simulation. Result showed that the spoiler ring can increase mixing and heat transfer intensity between particle and gas species

and improve the evaporation and combustion of Al particle

which resulting in the increase of combustion efficiency of the powdered rocket motor. When the ratio of spoiler ring flowing diameter to the combustion chamber diameter was between 0.538 and 0.846

the combustion efficiency increased with the reducing flowing diameter of spoiler ring. When the ratio of spoiler ring’s distance from the chamber’s head position to the chamber’s total length was between 0.3 and 0.8

the combustion efficiency increased as the spoiler ring moved toward the chamber’s head. The spoiler ring with small flowing diameter and distance from the head between 30% and 40% of the chamber length could be better for the spoiler ring design of powdered rocket motor.