COMBUSTION CHAMBER WITH CATALYTIC COATING FOR RAMJET ENGINE AND METHOD FOR APPLYING A CATALYTIC COATING Russian patent published in 2021 - IPC F23R3/40 

FIELD: combustion chambers.

SUBSTANCE: invention relates to combustion chambers [CC] for a ramjet engine [ramjet] and can be used to acquire motor hypersound in dense layers of the atmosphere. In order to achieve the maximum speed limit in the motor hypersound in the transient mode followed by reaching the cruising flight altitude, stable and complete combustion of fuel in the CC must be achieved. Production of hydrogen in the conversion products with local concentration thereof in the fuel-air flow of at least 4% by volume due to the high specific surface area, no less than 158 m²/g; catalytic coating on a reticular metal carrier, must be achieved therefor during the flight of aircrafts in dense layers of the atmosphere. At this concentration of hydrogen in the CC, the hydrogen self-ignites and the fuel-air flow is ignited. Thus, hydrogen acts as an igniter. A connecting apparatus in form of a half-torus 10 is located on the side of the air intake, the outer diameter whereof is connected with the edge of the outer cylinder 2 of the CC 1, and the inner diameter is connected with the frame 5 of the TCR. The inner cylinder 3 of the CC 1 adjoins the half-torus 10. A steam-kerosene mixture is supplied to the half-torus 10 using the apparatus 11, passing through the TCR, and conversion products are output from the TCR into the CC 1 in the inner cylinder 3 by means of nozzles 12. The nozzles 12 are arranged evenly in diameter, no less than six, wherein the fuel supply is controlled using an on-board computer. The cylinders 2, 3 are made with a tapering of no more than 1.2 degrees towards the nozzle, the gap between said cylinders is 30 mm. A porous catalytic coating on a set of meshes 8, 9 is applied by oxidation at a temperature of 700 to 900°C, application of a substrate and a suspension thereon, followed by drying at a temperature of no less than 250°C and calcination. The suspension therein consists of gamma aluminium oxide and a mixture of cobalt, cerium and copper nitrates.

EFFECT: achievement of motor hypersound in the ramjet is ensured by stable and complete combustion of fuel in a supersonic CC.

2 cl, 8 dwg