The effect of inlet size, inlet Angle, dome height, primary nozzle expansion ratio and nozzle Numbers on combustion efficiency were taken into account.

The collision momentum of condensed particles has little relation with the injection nozzle configuration under the same primary nozzle equivalent diameter.

During the ground test of solid rocket motors, after the reversal nozzles are opened, the shock wave enters the primary nozzle. This phenomenon makes tested data processing difficult.