A high-efficiency cooling structure for the head of a flame cylinder

Abstract

The invention relates to an efficient cooling structure for the head of a flame tube. This structure can be applied to the head cooling of combustion chambers of gas turbines and aero-engines. The deflector is an integrated structure, including the deflector base plate, columnar protrusions, cooling air holes, straight ribs on the left and right sides, and a circular rib in the center. and connecting pieces; the deflector is installed on the end plate of the flame tube head through the connecting piece, and the cold gas coming in from the flame tube flows through the gap between the columnar protrusions, the gap between the columnar protrusions and the ribs, and the columnar The gap between the protrusion and the connecting piece, the air flow bypasses many columnar protrusions and efficiently cools the deflector and the head of the flame tube through these gaps, reducing the wall temperature; the structure of the deflector in the present invention is simple and can be Using casting or additive manufacturing printing molding, compared with the traditional flame tube head deflector structure, the heat exchange area is significantly increased, which can significantly improve the life of the flame tube head and deflector.

Description

technical field [0001] The invention belongs to the technical field of aero-engines and gas turbine combustion chambers, and in particular relates to a high-efficiency cooling structure for the head of a flame tube. Background technique [0002] With the increasingly stringent environmental protection regulations, in order to achieve low emission targets, civil aero engines and ground gas turbines mostly adopt lean-burn mode in the combustion chamber, that is, the intake air volume entering the combustion chamber from the head of the flame tube increases significantly, and the air intake at the head The air volume accounts for 40% to 60% of the total gas volume in the combustion chamber, which is significantly improved compared with the traditional combustion chamber; and for military engines with high thrust-to-weight ratio, with the increase of the oil-gas ratio, the intake air volume at the head of the combustion chamber will even increase. Reach 70-75%. This means that ...

AI Technical Summary

Problems solved by technology

[0004] For high-temperature rise and low-emission combustion chambers, the head generally adopts a complex and large-scale staged combustion scheme, which brings great difficulties to the cooling of the flame tube head

In order to improve the service life of the flame tube, a deflector is installed on the head of the flame tube in the traditional combustion chamber, which is used for thermal protection of the head of the combustion chamber. If the deflector is not effectively cooled, it is easy to be burned and ablated by the high-temperature gas in the combustion chamber , which in turn affects the cooling of the head of the flame tube and reduces the service life of the flame tube

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