A combustion chamber adopting the pre-film atomization method of the trailing edge of the swirl blade

Abstract

The invention provides a combustion chamber adopting a swirl vane tail edge pre-film atomization mode. The combustion chamber comprises a combustion chamber flame tube, a center level oil and gas mixing assembly and a main combustion level oil and gas mixing assembly which is arranged at the front end of the combustion chamber flame tube and the periphery of the center level oil and gas mixing assembly. The main combustion level oil and gas mixing assembly comprises a main combustion level swirl channel, N wedge-shaped swirl vanes and M vane interior oil paths; the N wedge-shaped swirl vanes are slantly fixed to the interior of the main combustion level swirl channel, and the M vane interior oil paths are arranged in at least one part of wedge-shaped swirl vanes respectively; the front end of each vane interior oil path is connected with a main combustion level oil cavity, and the tail end of the each vane interior oil path extends to the tail edge of the corresponding wedge-shaped swirl vane; the M is smaller than or equal to the N. The swirl vanes are wedge-shaped; velocity gradients are formed at the tail edges of the swirl vanes; a fuel liquid film flowing out of the tail edges of the swirl vanes is rapidly shorn and atomized under the action of the velocity gradients; the oil and gas blending distance is short, and the flame length and the length of the flame tube are shortened.

Description

technical field [0001] The invention relates to the technical field of engine combustion chambers, in particular to a combustion chamber adopting a method of mixing oil and gas with pre-film atomization at the trailing edge of swirl blades. Background technique [0002] In order to further reduce the impact of civil aviation engines on the upper atmosphere, the requirements of the International Civil Aviation Organization on the pollutant emissions (especially NOx) of civil aviation engines are becoming more and more stringent. Studies have found that nitrogen oxides tend to form in large quantities in the high-temperature area of ​​the combustion chamber, so the main measure to reduce pollutant emissions in the combustion chamber is to avoid local high temperatures in the combustion area. Today's mainstream low-pollution combustor technologies include Lean Premixed-Prevaporized combustor (LPP), Lean Direct Injection (LDI) and rich-quench-lean (Rich burn -Quick quench-Lean ...

AI Technical Summary

Problems solved by technology

[0005] However, for the above-mentioned multiple combustion chambers, the fuel is injected laterally into the swirling air of the main combustion stage, and the fragmentation and atomization of the fuel mainly depends on the aerodynamic force of the swirling air. Longer, it is necessary to accurately control the relevant parameters to achieve the ideal mixing effect, which is not conducive to shortening the length of the flame and the length of the flame tube

In addition, in the case of low fuel flow, due to the small initial momentum of the fuel, the fuel will flow along the wall under the action of the swirling air, resulting in fuel coking and other consequences

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