Prefilming three-stage pre-mixing and pre-evaporating low-pollution combustor

Abstract

The invention provides a prefilming three-stage pre-mixing and pre-evaporating low-pollution combustor which comprises a diffuser, an outer combustor case, an inner combustor case, a flame cylinder outer wall, a flame cylinder inner wall and a combustor head, wherein all the air for combustion enters a flame cylinder from the combustor head; the combustor head adopts a multi-stage combustion scheme which includes one precombustion stage and two main combustion stages; a premixed combustion mode is used for the main combustion stages; and a diffusion combustion mode with stable cyclone is used for the precombustion stage. The main combustion stage is structurally divided into two stages, thus avoiding the increase of pollutant emissions caused by poor main-stage oil and gas mixing during stage transfer under the condition of one main combustion stage, and simultaneously reducing the pollutant emissions by 30% in the working condition without affecting combustion stability; and a prefilming nozzle is used for the second main combustion stage, thus ensuring fuel oil to be distributed more uniformly and further reducing the pollutants in the large working condition in comparison with a discrete nozzle. Thus, pollutant emissions generated in the whole landing and take-off cycle of the aero-engine combustor is reduced without affecting combustion stability.

Description

technical field [0001] The invention relates to a low-pollution combustor of an aviation gas turbine utilizing premixed pre-evaporative combustion technology. The staged combustion mode is adopted, and the main combustion stage adopts the premixed combustion method, which is mainly used to reduce pollution emissions under large working conditions; the pre-combustion stage adopts the diffusion combustion method to ensure stable combustion in the combustion chamber, and the main combustion stage uses two The way of pre-mixed pre-evaporative combustion can reduce the pollution emission of the entire LTO cycle of the 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 e...

AI Technical Summary

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 pre-film type low-pollution combustion chamber with three stages of pre-mixing and pre-evaporation by using the premixed pre-evaporation combustion technology. The main combustion stage of the combustion chamber The pre-mixed combustion method is adopted, which can maintain low pollution emissions above 30% of the working conditions; the pre-combustion stage adopts the diffusion combustion method, which can ensure the stable operation of the engine under small working conditions, thereby reducing the pollution in the entire LTO cycle emission

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