Novel flame tube wall surface cooling structure
A technology of cooling structure and flame tube, applied in the direction of combustion method, combustion chamber, combustion equipment, etc., can solve the problem of decreased cooling capacity, and achieve the effect of reducing thermal stress, high cooling efficiency and good cooling effect
Inactive Publication Date: 2020-11-10
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
With the continuous improvement of the performance of aero-engines, the flame tube cooling technology is also facing two difficulties: one is that with the improvement of aero-engine performance, the amount of air required to directly participate in combustion is gradually increasing; the other is that the aero-engine pressurization The air temperature at the outlet of the compressor, that is, the temperature of the air used to cool the wall of the flame tube is also gradually increasing, so the cooling capacity of the air at the inlet of the combustion chamber as a coolant is gradually decreasing
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[0016] The present invention will be further described now in conjunction with accompanying drawing:
[0017] combine Figure 1 to Figure 4 , The present invention provides a schematic diagram of a novel flame tube wall cooling structure, including the outer wall surface (1) of the flame tube, the corrugated groove area (2), the inclined hole (3), and the inner wall surface of the flame tube (4).
[0018] Specific process: When the cooling gas enters the flame tube from the outer wall (1) of the flame tube, it will pass through the corrugated groove area (2), first forming an impingement cooling in the groove area, and then from the inclined hole (3) on the groove area Entering the flame tube, the cooling air passing through the oblique hole cools the wall through convective heat exchange in the wall before forming a gas film, and then forms a "gas film blanket" that continuously covers the inner wall (4) of the flame tube, thereby isolating The high-temperature gas and the w...
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The invention provides a novel flame tube wall surface cooling structure. The structure is characterized in that corrugated groove areas are punched on a flame tube wall surface, the groove areas areW-shaped, an inclined hole is punched in each side surface, and areas between the inclined holes in the two side surfaces of corrugated middle areas are communicated with each other. When cooling gasenters a flame tube from an outer wall of the flame tube, the cooling gas passes through the corrugated groove areas to form primary impact cooling and then enters the flame tube from the inclined holes, the cooling gas passing through the inclined holes cools the wall surface through convection heat exchange in the wall surface before forming a gas film, and then a gas film blanket continuously covering the inner side wall surface of the flame tube is formed, so that high-temperature fuel gas is isolated from the wall face of the flame tube, heat exchange can be formed when the cooling gas enters the communicated inclined holes in the corrugated middle area, and the cooling effect is better. Compared with a traditional flame tube wall face punching structure, the structure adopts multipletimes of cooling, so that the cooling efficiency of the flame tube cooling structure is improved, and the service life of the flame tube can be prolonged.
Description
technical field [0001] The invention belongs to the field of aero-engine combustion chambers, and in particular relates to a novel wall surface cooling structure of a flame tube. Background technique [0002] The gas temperature in the main combustion zone of the combustion chamber can be as high as 2400K, which is the highest temperature zone of the gas turbine. At present, the normal working temperature of the metal material of the flame tube wall does not exceed 1300K, and the material cannot withstand working for a long time in a harsh environment far exceeding its normal working temperature. Therefore, the combustion chamber flame tube must be cooled to prevent the flame tube from being burned out and reduce the life of the combustion chamber, thereby reducing the life of the engine. In order to ensure that the combustion chamber has a long enough service life and reliability, two solutions are usually adopted: one is to increase the allowable working temperature of the...
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IPC IPC(8): F23R3/42
CPCF23R3/42
Inventor 张群胡凡李小龙程祥旺王紫欣王晓燕马晓曦高耀红
Owner NORTHWESTERN POLYTECHNICAL UNIV