Application of annular clustered plug nozzle to solid rocket motor

The structure characteristics of three types of plug nozzles applied to solid rocket motor were compared, and the structure properties of annular clustered plug nozzle were mainly discussed. Based on the current design method, the property comparison method of annular clustered plug nozzle and bell nozzle was defined, the size and the weight of the annular clustered plug nozzle were analyzed, and the examples of the annular clustered plug nozzle applied to the first stage motor and the upper stage motor of strategic missile were given. The results show that throat diameter of the inner nozzle is the most important design parameter influencing structure size of the annular clustered plug nozzle. When numbers of the inner nozzle are enough, plug nozzle has less size, less weight and higher thrust efficiency than the bell nozzle under same area ratio. Finally, the key techniques of the annular clustered plug nozzle were indicated.