Single-vortex combustion chamber

Abstract

The invention discloses a single-vortex combustion chamber, which adopts a full-circular flame cylinder structure, and is mainly composed of a shell and inner and outer flame cylinders inside; due to the use of lean fuel combustion, the combustion chamber is not provided with a main combustion nozzle, and the outer flame Evaporation tubes are evenly arranged in the circumferential direction of the concave cavity formed by the cylinder; multiple mixing holes and cooling holes are opened in the concave cavity outlet, and the mixing holes and cooling holes are deflected in the circumferential direction and the axial position. The invention solves the problems of lean fuel combustion, ignition and flame stabilization under high-speed airflow, uniform temperature field at the outlet of the combustion chamber, and cooling of the wall surface of the combustion chamber under the conditions of high air flow velocity, high temperature and limited cooling gas volume at the inlet of the combustion chamber. Its application to small aero-engines has made a good bedding.

Description

technical field [0001] The invention relates to a novel combustion system used for high-speed airflow at the inlet and small oil flow, especially for single-vortex combustion chambers used in small and medium-sized aero-engines that require small temperature rise and uniform outlet temperature field. 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 combustion chamber head mainly adopts the combined configuration of swirler and nozzle. After the air passes through the cyclone, a recirculation area is generated, and the high temperature combustion products flow to the front end under the action of the recirculation area, igniting the mixtu...

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Problems solved by technology

[0006] Among the above-mentioned combustion chambers, the tangential trapped vortex combustion chamber introduced in the publication number CN1858498 does not use the oil supply method of the evaporator tube but uses a centrifugal nozzle or a pneumatic atomizing nozzle; the formed circumferential vortex interacts with the trapped vortex in the cavity ; The wall of the concave cavity directly opens holes for air intake, without using a baffle structure

A gas turbine engine combustor cylinder assembly introduced in the publication number CN1467407A does not use an evaporator tube for oil supply, but the mainstream adopts fuel and air premixed gas; the mainstream does not adopt a diffuser structure, which limits the flow velocity of the mainstream to a certain extent; There is no baffle structure in the cavity, but holes are directly opened on the wall of the cavity, and the air intake of the cavity is not guaranteed; there is no mixing hole at the exit channel of the cavity, which is replaced by the petal-type support plate structure by the mainstream, 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 HAVING TRAPPEDVORTEX 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 cavity has no baffle structure but directly opens holes on the wall of the cavity, and the air intake of the cavity is not guaranteed; there is no mixing hole at the exit channel of the cavity, and the The structure of the diffuser is replaced by the support plate, and the weight is relatively large; the oil supply and air intake holes of the concave cavity adopt a surrounding structure, which is not conducive to the formation of the standing vortex

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