Partial pre-mixing and pre-evaporation burning chamber with prefilm type nozzle

Abstract

The invention belongs to the field of aeroengines and mainly relates to a partial pre-mixing and pre-evaporation burning chamber with a prefilm type nozzle. The head of the burning chamber consists of an auxiliary burning level and a main burning level, wherein the auxiliary burning level comprises a primary axial swirler, a contraction section, a throat, an expansion section and an auxiliary oilway nozzle; and the main burning level comprises a primary axial swirler, a primary radial swirler, a pre-mixing section, a contraction throat and the prefilm type nozzle. The burning chamber at the head in the above structure adopts a DIPME (direct injection pre-mixing and pre-evaporation) mixed burning mode with central classification, when in small fire state, the auxiliary burning level adopts a rich oil direct injection burning mode, and when in large fire state, the auxiliary burning level adopts a lean oil direct injection burning mode, and the main burning level adopts a lean oil partial pre-mixing and pre-evaporation burning mode. In order to guaranteeing fuel oil atomization, the main burning level adopts the prefilm type nozzle. The head of the burning chamber can guarantee performance of the burning chamber, and pollutant discharge is greatly reduced.

Description

technical field [0001] The invention belongs to the field of aero-engines, and mainly relates to a partially premixed pre-evaporation combustor with a pre-film nozzle. Background technique [0002] In the 1980s, the International Civil Aviation Organization promulgated the "Environmental Protection Standards" and "Aero Engine Emissions" regulations, which have been continuously revised and improved. At present, the CAEP6 emission standards have been implemented. All major aero-engine companies and research institutions regard the control of pollutant emissions as an important research topic, among which low-emission combustion technology is one of the most important research contents of civil aero-engines. Since pollution emission is a mandatory requirement for airworthiness certification for civil aircraft engines, several internationally renowned aero engine companies in Europe and the United States have implemented advanced civil engine development plans in response to in...

AI Technical Summary

Problems solved by technology

The combustion chamber using this technology usually has a long premixing section, which is prone to spontaneous combustion and backfire, and because this combustion chamber burns in a lean state, the mixing and evaporation are very good, which doubles the probability of unstable combustion

The traditional combustion chamber is designed with a rich oil head, and the equivalence ratio of the combustion zone is about 1.0. This combustion method cannot reduce the emission of pollutants, especially the generation of NOx. The combustion chamber of pre-vaporization technology works more stably, and some of its combustion chambers have higher basic performance, such as idle lean burnout boundary (LBO) and lean fuel ignition boundary (LLO)

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