Double-vortex combustion chamber

Abstract

The invention discloses a double-vortex combustion chamber which adopts a full ring shaped flame tube structure and comprises a shell, an inner flame tube and an outer flame tube. The outer wall of the outer flame tube and the inner wall of the shell form a cooling cavity channel; the inner wall of the outer flame tube and the outer wall of the inner flame tube form a combustion channel; oil injection pipes and an igniting seat are arranged on the periphery of the shell; the outer flame tube is an integral forming part, the first section thereof is a diffusion section which adopts a constant pressure gradient design, and the second section thereof is provided with two rows of advancing air holes at the edge of the front wall of a recessed cavity, an evaporating pipe extends into the recessed cavity along the periphery direction of the recessed cavity and close to the inner side of the front wall of the recessed cavity, and the back wall of the recessed cavity is provided with a back air inlet duct at the half height; the third section is provided with an air film cooling air inlet port and an air film cooling air inlet baffle; and the fourth section is provided with a blending hole and a diffusion cooling hole. The double-vortex structure formed in the recessed cavity of the double-vortex combustion chamber improves the distribution of a fuel concentration field, realizes fractional combustion, increases the residence time of fuel combustion, reduces the pollutant discharge and ensures the outlet temperature to be more uniform.

Description

technical field [0001] The invention relates to a twin-scroll combustion chamber, which belongs to the field of engines. Background technique [0002] The combustion chamber is an important part of the engine where fuel is burned, converting chemical energy into heat. A good combustion chamber should have the basic characteristics of good ignition performance, uniform temperature distribution, small flow resistance loss, less exhaust pollution and compact structure. [0003] The traditional aircraft engine combustor head mainly adopts the combination configuration of swirler and nozzle. After the air passes through the swirler, a recirculation zone is generated, and the high-temperature combustion products flow to the front end under the action of the recirculation zone, igniting the mixture of fresh fuel and air, and the recirculation zone acts as a stable ignition source. Trapped vortex combustor (TVC for short), which abandons the traditional combustion chamber design o...

AI Technical Summary

Problems solved by technology

A gas turbine engine combustor barrel assembly introduced in the publication number CN1467407A adopts fuel and air premixed gas; the mainstream does not adopt a diffuser structure, which limits the flow rate of the mainstream to a certain extent, and adopts a petal-type support plate structure, which increases the weight

In application number 5791148, application date Aug, 11, 1998, the trapped vortex combustor introduced in LINER OF A GAS TURBINE ENGINE COMBUSTOR HAVINGTRAPPED VORTEX CAVITY (the gas turbine combustion chamber using the trapped vortex concave cavity) is applied to the design of the main combustion chamber of the aero-engine Among them, the mainstream adopts the fuel injection rod to supply oil, which is heavy; the support plate diffuser structure is adopted, which is heavy; the concave cavity oil supply and the air intake hole adopt a surrounding structure, which is not conducive to the formation of the standing vortex

In the single-vortex combustion chamber introduced in the publication number CN101070961A, a baffle plate structure is adopted on the concave cavity, which increases the weight; the single-vortex structure formed in the concave cavity makes the distribution of the fuel concentration field not uniform enough, and the residence time of its combustion in the concave cavity is not enough long, which limits the further improvement of combustion performance to a certain extent

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