Combustion chamber

Abstract

The invention aims to provide a combustion chamber. The combustion chamber adopts a single-ring-cavity flame tube structure, and the pollution emission of a whole LTO cycle of an engine is reduced onthe premise of ensuring the performance of the combustion chamber. In the combustion chamber, the main combustion stage involves an inner swirler, an outer swirler, an oil collecting ring and a premixing pre-evaporation section; the outer swirler adopts a radial swirler, the inner swirler adopts an axial swirler, and the oil collecting ring adopts direct fuel injection holes which are uniformly distributed in the circumferential direction, the fuel oil forms a direct spraying oil mist and forms the main combustion stage pneumatic atomizing oil mist by crushing and atomizing under the shearingaction of an inner swirling flow and an outer swirling flow; and the premixing pre-evaporation section adopts a nozzle structure and has a throat, the direct fuel injection holes are located in the 20%-80% range of the throat height relative to the radial position of the premixing pre-evaporation section of the main combustion stage, and the included angle between the injection direction of the direct fuel injection holes and the axis direction of the main combustion stage is negative 15 degrees to 60 degrees.

Description

technical field [0001] The invention relates to a combustion chamber structure, especially for an aero-engine. Background technique [0002] The basic performance and structural distribution of modern aero-engine combustors have reached a fairly high level, but there are still a lot of problems and challenges for modern aero-engine combustors. The development and application of new materials, new processes, new structures, and new concepts It is the source to ensure its continuous progress. [0003] The main development trend of modern civil aeroengine combustors is low-pollution combustion. Combustion chambers of civil aeroengines must meet increasingly stringent aeroengine pollution emission standards. The currently adopted CAEP6 (Committee on Aviation Environmental Protection) standard has very strict regulations on pollutant emissions, especially for NOx pollution emission requirements; and the latest CAEP8 standard proposes to reduce NOx emissions by 15% on the CAEP6 ...

AI Technical Summary

Problems solved by technology

In the small state, the equivalence ratio of the combustion zone is very low, far below the 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 not uniform, so for the conventional combustion chamber, it cannot meet the low pollution requirements in the entire engine operating range

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