Gas-gas mixed flame stabilization device

Abstract

The invention provides a gas-gas mixing flame stabilizing device, and relates to the technical field of engines; the gas-gas mixing flame stabilizing device comprises a beveling type lobed mixer and acover plate; the beveling type lobed mixer is of a hollow conical columnar structure with openings in two axial ends; the cover plate is of a plate-type structure with an indent section; the inlet end of the beveling type lobed mixer is connected with the outlet end of an external turbine; the shape of the indent face of the cover plate is consistent with the shape of the beveling type lobed mixer; the indent face of the cover plate is fixedly installed on the outlet end face of the beveling type lobed mixer correspondingly; the convex face of the cover plate is in butt joint with the inlet end of an external combustion chamber; the cover plate is of a petal-like structure, and comprises a center plate and n lobes; the center plate is of a circular plate-type structure; and the n lobes are uniformly distributed at the side position of the center plate annularly; and the n is a positive integer between 12-24. The gas-gas mixing flame stabilizing device is simple and reliable in structure and light in weight, and high-efficiency mixed combustion of inner duct fuel-rich gas and outer duct air can be achieved under the condition that the pressure loss is lower (the total pressure recovery coefficient of the fuel-rich gas in the mixer is not less than 0.80).

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a gas-gas mixing flame stabilizing device. Background technique [0002] Combination power engines such as air turbine rocket 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 fuel-rich gas at the inlet of the combustion chamber change continuously with changes in engine operating conditions. Organizing the secondary stable and high-efficiency combustion of internal fuel-rich gas and external air in the combustion chamber is crucial to engine performance, and improving the mixing uniformity of fuel-rich gas and air is the most effective way to achieve high-efficiency combustion in the combustion chamber. The conventional internal and external airflow mixing adopts a lobe mixer, which uses the viscous shear-enhanced mixing of the boundary layer of the two airflows at the trailing edge of...

AI Technical Summary

Problems solved by technology

However, the penetration ability of rich combustion 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 by relying on the viscous shear of the velocity difference between the inner and outer airflows.

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