关键词: 固体推进剂火箭发动机;环形喷管;推力;比冲

Abstract: Explains the concept,characteristics,type and application of annular nozzle in details,concisely introduces the research situation of annular nozzle at home and abroad and describesproblems and their solutions appearing in practical application of annular nozzle. All theory research,cooled-flow test and firing test indicate that annular nozzles are much shorter and lighter compared toconvention nozzles in same expand ratio. Annular nozzles can automatically adapt the change ofenvironment pressures,so they always maintain high efficiency in different altitudes. Because of thepossibility to realize the material and structure of annular nozzles, the concept of annular nozzles isbrought up again and concrete metheds are established. Therefore,they are applicable and perspectiveto improve the thrust and impuls of rocket motors in the future.

Key words: Solid propellant rocket engine;Annular nozzle;Thrust;Specific impulse