Combined cycle integrated combustor and nozzle system
View Patent ↗An engine that operates and produces the entire required vehicle thrust below Mach 4 is useful for a Hypersonic combined cycle vehicle by saving vehicle and engine development costs. One such engine is a combined cycle engine having both a booster and a dual mode ramjet (DMRJ). The booster and the DMRJ are integrated to provide effective thrust from Mach 0 to in excess of Mach 4. As the booster accelerates the vehicle from Mach 0 to in excess of Mach 4, from Mach 0 to about Mach 2 incoming air delivered to the DMRJ is accelerated by primary ejector thrusters that may receive oxidizer from either on-board oxidizer tanks or from turbine compressor discharge air. As the TBCC further accelerates the vehicle from about Mach 0 to in excess of Mach 4 exhaust from the turbine and exhaust from the DMRJ are combined in a common nozzle disposed downstream of a combustor portion of said DMRJ functioning as an aerodynamic choke.
1. A combined cycle engine, comprising:
a turbojet engine booster;
a dual mode ramjet (DMRJ) having a plurality of struts with primary ejector thrusters affixed to trailing edges thereof; and
a supply line coupling said turbojet engine booster to said DMRJ effective to provide turbine compressor discharge air to said primary ejector thrusters, wherein said booster and said DMRJ are integrated to provide effective thrust from Mach 0 to in excess of Mach 4.
2. The engine of claim 1 wherein said turbojet engine booster and said DMRJ have a common air inlet.
3. The engine of claim 2 wherein said common air inlet includes a streamline effective to divert a portion of incoming air to said DMRJ and a remaining portion of said incoming air to said turbojet engine booster.
4. The engine of claim 1 wherein exhaust from said turbojet engine booster and exhaust from said DMRJ are selectively combined in a common nozzle to form an aerodynamic choke located downstream of a DMRJ combustor.
5. The engine of claim 4 wherein said common nozzle has a larger cross-sectional area than said DMRJ combustor.
6. The engine of claim 5 wherein a nozzle flap is effective to control combination of said booster exhaust and said DMRJ exhaust.
7. A combined cycle engine, comprising:
a turbojet engine booster;
a dual mode ramjet (DMRJ) having a plurality of struts with primary ejector thrusters affixed to trailing edges thereof;
a supply line coupling on-board oxidizer tanks to said DMRJ effective to provide an oxidizer to said primary ejector thrusters, wherein said booster and said DMRJ are integrated to provide effective thrust from Mach 0 to in excess of Mach 4.
8. The engine of claim 7 wherein exhaust from said turbojet engine booster and exhaust from said DMRJ are selectively combined in a common nozzle to form an aerodynamic choke located downstream of a DMRJ combustor.
9. The engine of claim 8 wherein said common nozzle has a larger cross-sectional area than said DMRJ combustor.
10. The engine of claim 9 wherein a nozzle flap is effective to control combination of said booster exhaust and said DMRJ exhaust.