A lean-oil premixed pre-evaporation combustor head structure using a swirler/pre-diaphragm integrated main combustion stage

Abstract

The invention relates to a lean oil premixing and pre-evaporating combustion chamber head structure with a cyclone / pre-film plate integrated primary combustion stage. A central staged combustion mode is adopted for the head structure and divided into a pre-combustion stage and the primary combustion stage, the mode of combining diffusive combustion and cyclone premixing combustion is adopted for the pre-combustion stage, the mode of premixing and pre-evaporating combustion mode is adopted for the primary combustion stage, and combustion pollutants can be effectively reduced. A cyclone / pre-film plate integrated structure is adopted for the primary combustion stage, the structure is simple and reliable, first-stage fuel and second-stage fuel form oil films on the same pre-film plate and are atomized, evaporated and mixed under the action of two strands of cyclones, an even oil and gas mixture can be easily formed at an outlet of the primary combustion stage, and the combustion pollutants are reduced. The design of dual oil paths of the primary combustion stage is beneficial to oil and gas matching of the combustion chamber under different working conditions, and the pollutant discharge level of the whole landing and take-off circulation of the combustion chamber of an aero-engine is further lowered. By means of the micro shrinkage type design of a primary combustion stage channel and the design of a backfire prevention ring, the backfire problem can be effectively solved, and the safety of the head of the combustion chamber is ensured.

Description

technical field [0001] The invention relates to the technical field of aviation gas turbines, in particular to a head structure of a fuel-lean premixed pre-evaporation combustor adopting a swirler / pre-membrane integrated main combustion stage. The combustion stage is in the center, and a combination of diffusion combustion and premixed combustion is adopted to ensure the stability and safety of the combustion chamber, and at the same time reduce pollution emissions under small working conditions; The radial periphery adopts the method of premixed pre-evaporative combustion, and the design of the main combustion stage dual oil circuit can meet the needs of the first stage of the main combustion stage under small and medium working conditions such as approaching, and the two main stages of the main combustion stage can work under heavy working conditions such as takeoff. The work is conducive to the matching of oil and gas under different working conditions of the combustion cha...

AI Technical Summary

Problems solved by technology

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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