Pneumatic primary level graded low-pollution combustion chamber

Abstract

The invention discloses a pneumatic primary level graded low-pollution combustion chamber, which consists of a shunting diffuser, a combustion chamber outer case, a combustion chamber inner case, a fuel nozzle rod, a flame tube head, a flame tube outer wall and a flame tube inner wall, wherein the flame tube head mainly comprises a precombustion level, a main combustion level, an isolation section, a head splashing disc and a head end wall; the precombustion level stabilizes flame through a low-speed return flow zone generated by cyclone air which enters the combustion chamber through a cyclone assembly at the precombustion level; fuel at the main combustion level before a main combustion level graded ignition state is atomized under the action of airflow of an inner ring channel of the main combustion level; and the fuel after a main combustion level graded ignition state impacts the inner side of an inner ring of the main combustion level, and a pre-film vaporization mode is formed under the action of airflows of the inner ring and outer ring channels of the main combustion level. Therefore, main-level air fuel premixed gases before the main combustion level graded ignition state can stop for enough time in a main combustion zone, most of the main-level air fuel premixed gases after the combustion level graded ignition state do not enter the low-speed return flow zone stabilized flame, and complete combustion in the combustion chamber in various working states and reduction of pollution emission are guaranteed.

Description

technical field [0001] The invention relates to a low-pollution combustion chamber adopting a pneumatic main stage classification. The structure of the combustion chamber adopting the organization mode of the pneumatic main stage classification is simple, which can ensure the efficient and stable operation of the combustion chamber at each state point, and at the same time reduce the combustion rate. The purpose of pollution discharge. Background technique [0002] The basic performance and structural distribution of modern aero-engine combustors have reached a fairly high level, but for modern aero-engine combustors, there are still a lot of problems and challenges. The development of new materials, new processes, new structures, and new concepts Application is the source to ensure its continuous progress. The main development trend of modern aero-engine combustors is low-pollution combustion. Aeroengine combustors must meet increasingly stringent aeroengine pollution emi...

AI Technical Summary

Problems solved by technology

In the low power state, the equivalent ratio of the combustion zone is very low, which is far lower than the above-mentioned equivalence ratio range required for low-pollution combustion. At this time, although NOx emissions are low, CO and UHC emissions are high

In addition, because the conventional combustion chamber generally adopts the diffusion combustion method, the local equivalence ratio is very uneven, so for the conventional combustion chamber, it cannot meet the low pollution requirements in the entire engine operating range

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