Variable structure combustion chamber of rocket-based-combined-cycle engine

Abstract

The invention discloses a variable structure combustion chamber of a rocket-based-combined-cycle engine. The variable structure combustion chamber is composed of a drive system, a back pressure cavity and a combustion chamber body. The drive system is located at the upper portion of the back pressure cavity. The back pressure cavity is fixed to the portion above variable sections of the combustion chamber body and forms an integral structure with the combustion chamber body. A combustion chamber fixed section is sequentially connected with variable sections of the combustion chamber body. The variable sections are connected through cooperation of ball head hinge convex faces and ball head hinge concave faces. Two sets of hydraulic drive mechanisms drive the first variable section and the third variable section of the combustion chamber body through drive rods and connecting rods. Axial sealing grooves of the variable sections are filled with graphite strips so as to isolate high-temperature fuel gas in the combustion chamber body, and sealing is guaranteed. According to the variable structure combustion chamber, stable transition among different modes is achieved through grade adjustment. In the injection mode and the subsonic combustion mode, the variable sections of the combustion chamber body are adjusted by a hydraulic drive mechanism to generate different divergence angles and throat heights, so that the combustion chamber body is in the optimal work state, and the thrusting force and specific impulse performance of the combustion chamber body are obviously improved.

Description

technical field [0001] The invention relates to the technical field of rocket ramjet engines, in particular to a variable-structure combustion chamber of a rocket-based combined cycle engine. Background technique [0002] The Rocket-Based-Combined-Cycle (RBCC) engine has potential advantages such as reusability, low cost, and high reliability, and is considered to be one of the propulsion systems most likely to be used in future space-to-ground transportation systems. one. The rocket-based combined cycle engine integrates ejection mode, sub-combustion mode, super-combustion mode and pure rocket mode. In the super-combustion mode, in order to meet the needs of supersonic combustion, the flow channel of the combustion chamber needs to maintain an expanding structure; while in the ejection mode and sub-combustion mode, the flow channel of the combustion chamber needs to converge and expand to meet the high efficiency of the combustion chamber. combustion. The current rocket-...

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Problems solved by technology

The domestic research on variable structure ramjet is also mainly focused on the research of variable structure intake and exhaust, but there is no variable structure design for the combustion chamber.

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