Mixing flame stabilizing device

Abstract

The invention relates to the technical field of engines, and discloses a mixing flame stabilizing device. The mixing flame stabilizing device comprises a lobe mixer, a cover plate and turbulent flow columns, wherein a gas collecting cavity is formed between the cover plate and the lobe mixer; the turbulent flow columns are arranged at the position of an outer culvert air flow outlet of the lobe mixer; inner cavities of the turbulent flow columns communicate with the gas collecting cavity; the side walls of the turbulent flow columns and the cover plate are provided with spraying holes a and spraying holes b correspondingly; combustible gas is subjected to secondary flow dividing through the spraying holes a and the spraying holes b and then enters a combustion chamber to be mixed with air,the spraying pressure of the combustible gas is increased, accordingly, the penetrating capacity of the combustible gas in the gaseous environment is improved, and accordingly efficient mixing of twoair flows is achieved; and the turbulent flow columns are arranged at the position of the outer culvert air flow outlet of the lobe mixer, a large-scale radial vortex can be formed on the downstreamportion of the turbulent flow columns, outer culvert air is forced to flow in the circumferential direction of the turbulent flow columns at an outlet of the mixer, the mixing distance of the outer culvert air and inner culvert combustible gas is shortened, the mass exchange rate of the air and the combustible gas at an inner culvert outlet of the mixer is increased, and the mixing effect is improved.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a mixing flame stabilizing device. Background technique [0002] Combined power engines such as air turbine rocket (ATR) engines have a wide operating range (Ma0-3.5+), and parameters such as the flow rate, flow rate, temperature, angle, and mixing ratio of air and combustible gas at the inlet of the combustion chamber change continuously with changes in engine operating conditions . Stable and efficient combustion of internal combustible gas and external air in the combustion chamber is crucial to engine performance, and improving the mixing uniformity of combustible gas and air is the most effective way to achieve high-efficiency combustion in the combustion chamber. [0003] The mixing of the inner and outer culvert airflows usually adopts a lobe mixer, which uses the viscous shear stress of the boundary layer of the two airflows at the trailing edge of the lobe t...

AI Technical Summary

Problems solved by technology

However, the penetration ability of combustible gas in the gaseous environment is limited, and it is difficult to achieve efficient and uniform mixing of the two airflows in a short distance simply relying on the viscous shear of the velocity difference between the inner and outer airflows.

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