Double-wall small bent pipe structure for backflow combustion chamber and backflow combustion chamber

Abstract

The invention discloses a double-wall small bent pipe structure for a backflow combustion chamber and the backflow combustion chamber. The double-wall small bent pipe structure comprises a bent pipe inner wall and a bent pipe outer wall which are arranged at intervals, wherein the bent pipe outer wall is arranged on the outer side of the bent pipe inner wall, and a middle cavity is formed betweenthe bent pipe outer wall and the bent pipe inner wall, first impact holes are formed in the bent pipe inner wall, an air film hole which penetrates through the bent pipe outer wall to be used for communicating the outer side of the bent pipe outer wall with the middle cavity is formed in the wall body of the first side of the bent pipe outer wall, and a part of cold air flow flowing into the middle cavity flows out of the air film hole and is attached to the outer wall surface of the bent pipe outer wall to flow under the combined action of the flow guide effect of the bent pipe outer wall andthe impact effect of high-temperature fuel gas flow on the outer side of the bent pipe outer wall so as to form a cold air protective film on the outer surface of the bent pipe outer wall; and meanwhile, the other part of cold air flow flowing into the middle cavity flows out towards a bend pipe outlet in the second side of the bend pipe outer wall along the middle cavity. The double-wall small bent pipe structure for the backflow combustion chamber is not prone to ablation.

Description

technical field [0001] The invention relates to the technical field of gas turbine engines, in particular to a double-walled small elbow structure for a recirculation combustion chamber. The invention also relates to a recirculation combustion chamber comprising a double-walled small elbow structure for the recirculation combustion chamber. Background technique [0002] The speed of small and medium gas turbine engines is very high. In order to avoid rotor dynamic problems, the compressor and turbine must be compactly arranged to shorten the wheelbase. In order to organize efficient combustion in a limited space, the annular recirculation combustion chamber is used in small and medium gas turbine engines. is widely used in. [0003] As a unique structure on the return combustion chamber, the small elbow is an important temperature-bearing component in the return combustion chamber. Together with the inner ring of the flame tube and the inner casing, it forms the inner two c...

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Problems solved by technology

[0006] The double-walled small elbow structure and the return combustion chamber provided by the present invention solve the technical problems that the cooling efficiency of the small elbow in the existing return combustion chamber is low and the small elbow is easy to be ablated

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