Simulation for the two-phase flow aerodynamic throat of solid rocket motors

A ring aerodynamic throat concept in two-phase flow condition was simulated numerically. The gas-solid two-phase flow model adapted was two-dimensional axial Euler-Lagrange model. The influence and rules of secondary flow injection positions, injection angles, secondary flow rates and injector numbers to the modulation performance of aerodynamic throat were studied. The flow characters of aerodynamic throat in two-phase flow conditions were attained from simulation, and the results show that the performance of aerodynamic throat can be obviously increased by getting secondary flow injector close to throat, increasing secondary flow rate or decreasing secondary flow injection angle. Two main mechanism for aerodynamic throat to strengthen the ability of choking flow, which were increasing extrusion and flow drag, were summarized from the simulation results.