A blunt body flame stabilizer with a swirling vortex structure

Abstract

The invention provides a bluff body flame stabilizer with a swirl trapped vortex structure, which is used for flame stabilization in a combustion chamber of a high-speed aircraft. The flame stabilizer includes a casing and V-shaped grooves uniformly distributed in the casing along the circumference. and a cyclone radially distributed in the V-shaped groove, wherein the V-shaped groove is disconnected at the installation of the cyclone. The bluff body flame stabilizer with the swirl trapped vortex structure of the present invention generates trapped vortices in the flow field through the swirler, provides a stationary point of flame stability under near-lean extinction conditions, and effectively expands the stable operation of the combustion chamber. border.

Description

technical field [0001] The invention relates to the field of combustion, in particular to a blunt body flame stabilizer with a swirling vortex structure applied to a combustion chamber of a high-speed aircraft. Background technique [0002] Combustion stability is an important basis for evaluating the reliability of aeroengine afterburner. The flame stabilization in the combustion device is mainly achieved by creating a recirculation zone downstream of the flame stabilizer by swirl or blunt body flow. There are several mechanisms by which the recirculation zone stabilizes the flame. Based on the point of view of velocity matching, there will be a transition zone where the velocity gradually changes between the return flow and the incoming flow in the recirculation zone, and there is a flame stabilization zone that can match the flame propagation speed in this region; , the heat absorption of the incoming air mixture and the heat release of high-temperature combustion produ...

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Problems solved by technology

However, the generation of the swirl vortex needs to be in a confined space enclosed around. For a combustion chamber with a large internal space, when the size of the swirler is small, the combustion chamber can be approximated as an unrestricted space, so it is difficult to Swirl downstream of the flame holder prevents the center of low pressure necessary for backflow

[0004] Therefore, it is necessary to provide a flame stabilizer to simultaneously solve the problem that the structure of the recirculation region produced by the V-shaped groove flame stabilizer is unstable in a near lean state and that the traditional cyclone flame stabilizer cannot form a vortex in an unconfined space. question

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