In order to study the two phase flow characteristics of angle-cut nozzle of solid rocket motor (SRM)

a gas-particle two-fluid model was adopted and combined with multi-region hybrid grid technology

and the interaction between gas phase and particles in the scarfed nozzle of solid rocket motor was researched. The effect of particle diameter and mass fraction on the gas-solid two phase flow characteristics of angle-cut nozzle was also investigated. Results showed that

the existence of solid particle phase had an important effect on the flow field structure of gas phase for angle-cut nozzle of SRM

bringing about a region with low velocity and high temperature of gas flow near the nozzle axis. At the same time

there was an area near the nozzle wall without particles. With the increase of particle diameter

the region gradually expanded without particles. The larger the particle diameter

the smaller the velocity; and the detention time was longer in the nozzle. The change of particle diameter and mass fraction also affected the flow field structure of rocket nozzle

with the increase of particle diameter

the gas phase Mach number first decreased and then increased along the nozzle axis

and the gas temperature first increased and then decreased

the trend of engine thrust was the same as that of Mach number

but both of which did not reach the extreme point simultaneously. The larger the particle mass fraction

the smaller the gas phase Mach number along the nozzle axis and the value of engine thrust; and the loss of two phase flow in the nozzle was larger.