A rocket-based combined cycle engine variable structure tail nozzle

Abstract

The invention discloses a variable-structure exhaust nozzle of a rocket based combined cycle engine. An inner flow field of the exhaust nozzle is in an overexpansion state under an injection modality, the inner flow field of the exhaust nozzle is in an under-expansion state under an under-combustion / super-combustion state, an upper cover plate is driven by a motor, and suction slotted holes in a rear body of an aircraft is made to be in an opened or closed state. The suction slotted holes in the upper wall face of the a spray pipe are opened when the engine works at a non-design point, the suction slotted holes in the wall face of the spray pipe are closed when the engine works at a design point, the work performance of the spray pipe under the injection modality is improved, and meanwhile it is guaranteed that the work performance of the spray pipe under the under-combustion / super-combustion modality is not reduced. The variable-structure exhaust nozzle is strong in expandability, and the suction slotted holes with different section areas can be designed according to the actual geometric structures, the work envelope curve and the work performance needs of the exhaust nozzle. The suction slotted holes are distributed according to the actual structural size of the exhaust nozzle, and the work performance of the exhaust nozzle under the non-design point is improved.

Description

technical field

[0001] The invention belongs to the field of rocket ramjet engines, and in particular relates to a variable-structure tail nozzle of a rocket-based combined cycle engine. Background technique

[0002] The Rocket-Based-Combined-Cycle (RBCC) engine has the advantages of reusability, low cost and high reliability, and is considered as one of the potential propulsion systems for space-to-ground transportation systems. The rocket-based combined cycle engine can take off from the ground at zero speed, accelerate continuously during the flight, go through the subsonic stage, transonic stage, supersonic stage, hypersonic stage, and finally reach the cruising state; Cycle engines have the capability to operate continuously from sea level to outside the atmosphere. According to the working Mach number and working altitude, the rocket-based combined cycle engine goes through the following four modes in turn, namely ejection mode, sub-combustion ram mode, scram mode, an...

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