Variable-geometry RBCC (rocket based combined cycle) engine for ground experiment

Abstract

The invention discloses a variable-geometry RBCC (rocket based combined cycle) engine for a ground experiment. A mechanical structure adopting variable-geometry combustor grading adjustment is adopted, an engine is fixed on an experiment table, two actuating mechanisms are perpendicularly mounted on the experiment table at an equal interval, and the engine is located in brackets of the two actuating mechanisms; a fixed section combustor and a variable section combustor are fixedly connected, an inner cavity bottom plate of the fixed section combustor and an inner cavity bottom plate of the variable section combustor adopt an integrated structure, a flame stabilization device is mounted in the fixed section combustor, a variable geometry mechanism is simplified, and a pressed cavity cover plate is mounted above the variable section combustor; two actuating mechanisms drive upper cavity plates to move up and down in the vertical direction through hydraulic cylinder pistons and connecting rods respectively, four-level adjustment of the combustor in different Mach number ranges is completed, and combustor structures in different inlet Mach numbers are adjusted and kept. The engine is used for research of combustors in different Mach numbers and research of combustion dynamic response characteristics in the combustor structure adjusting process.

Description

technical field [0001] The invention relates to the technical field of rocket ramjet engines, in particular to a variable-geometry rocket-based combined cycle ground test engine. Background technique [0002] The rocket-based combined cycle (RBCC for short) propulsion system integrates the advantages of rocket engines and ramjet engines, has four modes, can achieve a wide range of flight from 0 to 8 Ma, and can flexibly adjust the thrust required by the mission during the acceleration and cruise stages. It has a good application prospect. The four modes of the rocket-based combined cycle engine share the same flow channel, but each mode has different requirements for the flow channel. Therefore, the better performance of each mode and the conversion between different modes should be achieved in the same flow channel It seems very important. The combustion chamber is one of the core components of the engine, and its performance determines the performance of the entire engin...

AI Technical Summary

Problems solved by technology

[0004] In order to avoid the deficiencies in the prior art, the present invention proposes a variable geometry rocket-based combined cycle ground test engine, which adopts a mechanical structure of variable geometry combustion chamber staged adjustment to realize the transformation of the combustion chamber configuration under different incoming flow Mach numbers, and Solve the dynamic sealing problem caused by variable structure during the actuation process

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