A combined flame stabilizer with adjustable concave cavity vortex structure and its working method

Abstract

The invention discloses a combined flame stabilizer capable of adjusting a cavity vortex area structure. The combined flame stabilizer comprises an outer cavity flame stabilizer, a radial flame stabilizer, an adjusting mechanism used for adjusting the axial relative position of the radial flame stabilizer to the outer cavity flame stabilizer, and a guiding groove used for limiting the axial maximum stroke of the adjusting mechanism; the outer cavity flame stabilizer comprises a cavity section and a horizontal section horizontally and axially extending out towards the front end along the cavitysection; and the radial flame stabilizer is located on the inner wall face of the horizontal section. The cavity vortex area structure is adjusted by changing the relative position between the radialflame stabilizer and a cavity, high combustion chamber ignition and flame stability performance is achieved, and the problem that lean oil ignition and flameout performance of an existing conventional cavity / supporting plate stabilizer is insufficient under the relative low temperature and high-speed airflow is solved.

Description

technical field [0001] The invention relates to an afterburner combustion chamber of a turbofan engine, a combustion chamber of a sub-combustion ramjet engine and a multi-mode combustion chamber of a turbofan / ramjet combined cycle engine, in particular to a combined flame stabilizer with an adjustable concave cavity swirl structure and its operation method. Background technique [0002] Turbine-based combined cycle (TBCC) as an air-breathing engine has the advantages of wide flight range, conventional takeoff and landing, and reusability, and is considered to be the most promising hypersonic vehicle at this stage. powerplant. Due to the large variation of the bypass ratio in the entire working range, the flow conditions of low flow temperature and excessive local flow velocity in the multi-mode combustion chamber of the TBCC engine bring difficulties to the ignition and flame stability inside the multi-mode combustion chamber. . [0003] With the increase of the airflow v...

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Problems solved by technology

[0005] Purpose of the invention: the present invention provides a combined flame stabilizer with an adjustable concave cavity vortex structure, and the concave cavity vortex structure can be adjusted by changing the relative position between the radial flame stabilizer and the concave cavity of the outer concave cavity flame stabilizer , obtain higher combustion chamber ignition and flame stability performance, and solve the problem of insufficient flameout performance at the lean point of the existing conventional concave cavity / support plate stabilizer at relatively low temperature and high-speed airflow

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