Low-pollution combustion chamber adopting forced diversion at primary combustion stage outlet

Abstract

The invention discloses a low-pollution combustion chamber adopting forced diversion at the primary combustion stage outlet, which adopts a single ring cavity structure and comprises a diffuser, a combustion chamber outer casing, a combustion chamber inner casing, a flame tube outer wall, a flame tube inner wall and a combustion chamber head, wherein the combustion chamber adopts a staged combustion scheme, and is divided into a precombustion stage and a primary combustion stage; and the precombustion stage adopts a cyclone-stable diffusion combustion / cyclone premixed combustion combination mode. By adopting the central staged structure, the precombustion stage structure is simple. The primary combustion stage adopts the axial cyclone matched with the prefilming plate structure to enhance the fuel premixing and preevaporation, so that the pollution discharge of the whole landing-takeoff circulation of the aircraft engine combustion chamber is further lowered. Particularly, the primary combustion stage outlet is provided with an air forced diversion ring, so that the primary combustion stage air forms a divergent flow, and a full central backflow region is formed in the combustion chamber, thereby improving the ignition performance of the central backflow region.

Description

Technical field [0001] The present invention relates to the technical field of aviation gas turbines, in particular to a low-pollution combustion chamber of aviation gas turbines with forced diversion at the outlet of the main combustion stage. The combustion chamber adopts a staged combustion mode with a pre-combustion stage in the center and adopts diffusion combustion and premixing. Combustion method, while ensuring stable combustion in the combustion chamber, reduces pollution emissions under small working conditions; the main combustion stage is outside the pre-combustion stage, and premixed and pre-evaporative combustion is used, which is mainly used to reduce large working conditions The pollutant emissions of the aero-engine can be reduced throughout the Landing and Take-off (LTO) cycle. Background technique [0002] The basic performance and structural distribution of modern aero-engine combustion chambers have reached a very high level, but for modern aero-engine combus...

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Problems solved by technology

[0023] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, and to provide a low-pollution combustion chamber in which the outlet of the main combustion stage adopts forced diversion by using the premixed pre-evaporative combustion technology. The combustion stage is in the center, adopting a combination of diffusion combustion and premixed combustion, while ensuring stable combustion in the combustion chamber, and reducing pollution emissions under small working conditions; The method is mainly used to reduce the pollution emission under large working conditions, thereby reducing the pollution emission of the entire LTO cycle of the aero-engine

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