Partial premixing and pre-evaporation combustion chamber with three-level oil passages

Abstract

The invention belongs to the field of aero-engines, and relates to a low-emission combustion chamber in a primary direct injection combustion mode and two-level premixing and pre-evaporation combustion mode. The head of the combustion chamber comprises a pre-combustion level, a middle level and a main combustion level, the pre-combustion level comprises a primary oblique axial swirler, a Venturi tube and a pre-combustion-level nozzle, the middle level comprises a primary oblique axial swirler, a sleeve, a premixing section and a middle-level nozzle, and the main combustion level comprises a primary oblique axial swirler, a premixing section and a direct fuel injection nozzle. The pre-combustion level is provided with the centrifugal nozzle with a single oil passage, and requirements on fuel concentration distribution and dimensional distribution are met by means of pressure atomization; and the middle level and the main combustion level are provided with the direct injection nozzles for initial pressure atomization, then secondary pneumatic atomization is carried out, fuel liquid drops are shorn to realize an excellent atomization effect, pollutant emission can be reduced greatly, particularly, pollutant emission can be effectively reduced by 30% by the middle level in a rated thrust state, and various problems caused by classification of an existing main combustion level are avoided.

Description

technical field [0001] The invention belongs to the field of aero-engines, and relates to a low-emission combustion chamber with a one-stage direct injection combustion mode and a two-stage partial premixed pre-evaporation combustion mode. 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 CAEP 6 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 h...

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 equivalent ratio of the combustion zone is about 1.0. This combustion method cannot reduce pollutants, especially the generation of NOx. Technology's combustion chambers work more stably, and some of its combustion chambers have higher basic performance, such as Idle Lean Blowout Boundary (LBO) and Lean Blowout Boundary (LLO)

Images