Simulation and comparison of internal flow fields in solid rocket motors with submerged and nonsubmerged nozzle

Based on FLUENT flow field calculation software, internal flow fields of full-size motors with submerged nozzle and non-submerged nozzle were simulatively calculated and compared by using 2D axisymmetric model and quasi-steady method. The results show that the configuration of submerged nozzle can effectively reduce gas velocity near the aft-dome case, and has better heat security environment. Pressure, velocity and temperature distributions in the chamber of both motors are approximately same. Gas velocity in outlet of the nonsubmerged nozzle motor is higher than that of the submerged nozzle motor, but gas temperature and pressure are lower.