A tangentially inclined annular film divergent cooling structure

Abstract

The invention discloses a tangentially inclined annular film divergent cooling structure, which comprises a flame tube wall surface, a gas membrane sheet and an air intake hopper. The wall surface of the flame tube is provided with a number of gas film holes for allowing cooling air to enter the flame tube. Several gas diaphragms are arranged on the inner side of the cylinder wall to make the cooling air flow tangentially along the wall of the flame cylinder, and several air inlet hoppers are arranged on the wall surface of the flame cylinder, and the air inlet hoppers are located on one side of the gas diaphragm. The invention belongs to the technical field of combustion chamber cooling. A gas film is arranged on the wall surface of the flame tube, and the cooling gas film is arranged in the tangential direction of the flame tube. When the hole is a bucket structure, the problem that the wall surface is difficult to cool can be well solved; a strong cooling gas film is formed downstream of the large hole (main combustion hole, mixing hole) to ensure the rationality of the wall temperature; the cooling gas film along the The flame barrel moves tangentially, extending its cooling coverage time.

Description

technical field [0001] The invention belongs to the technical field of combustion chamber cooling, and relates to a tangentially inclined annular film divergent cooling structure. Background technique [0002] Axial film cooling (in the direction of air flow) is a commonly used cooling form for flame cylinders. The cooling gas is sprayed against the wall through a certain number of small holes or annular gaps, and a layer of axial protective gas is formed between the inner wall of the flame cylinder and the gas. membrane. Air film cooling is suitable for various pressure drop working environments and cooling of different parts of the flame tube. There are 4 forms such as intake air between intake air. Film cooling can be used alone for flame tube cooling, or combined with convection cooling, impingement cooling, etc. to form composite cooling. Pure gas film cooling is most widely used in combustion chambers of current and research engines, as well as advanced engine combu...

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Problems solved by technology

[0004] The main disadvantages of the existing technical solutions: 1. The gas jet flow of the main combustion hole cuts off the cooling gas film covering the wall, and the local position downstream of the main combustion hole lacks a cooling gas film; 2. A low-velocity zone is usually formed downstream of the gas jet flow of the main combustion hole , in the low-velocity area, it is generally a high-temperature area, which is likely to cause ablation of the wall surface; 3. If the main combustion hole uses an air intake bucket structure, the wall surface temperature of the bucket is usually high, and the existing cooling method cannot be used well 4. If divergent cooling holes are used downstream of the main combustion holes, the cooling capacity is usually limited, and the ablation problem cannot be solved well; in order to solve the above defects, a solution is now provided

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