Ceramic-based flame tube positioning structure

Abstract

The invention discloses a ceramic-based flame tube positioning structure, and belongs to the technical field of aero-engines; the ceramic-based flame tube positioning structure comprises a flame tube head integrally formed with an inner ring of a flame tube; the flame tube head comprises a flange arranged on the outer edge of the flame tube head and a concave spigot close to the flange; the inner ring of the flame tube comprises a small bent pipe; an annular groove is formed in the tail end of the small bent pipe; the inner ring of the flame tube is in lap joint with a combustion chamber inner case through the annular groove; a plurality of positioning pins are circumferentially and uniformly distributed on a combustion chamber outer case; a plurality of positioning pin seats matched with the positioning pins are uniformly distributed on the ring surface of an outer ring of the flame tube and are used for supporting the flame tube. In the working state, through the reserved gap between the positioning pin and the hole bottom of the positioning pin seat and the gap of the annular groove, the space requirement needed by thermal expansion of the positioning pin, the combustion chamber inner case and an outlet supporting ring can be met. No matter in a cold state or a hot state, the combustion chamber inner case and the outlet supporting ring can also play a role in auxiliary support on the wall surface of the flame tube.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and in particular relates to a ceramic-based flame tube positioning structure. Background technique [0002] With the development of engine technology, the working temperature of the flame tube in the combustion chamber is gradually increasing. On the basis of meeting the requirements of light weight, high reliability and long life, the material of the flame tube is required to further improve the temperature resistance of the material. Using ceramic matrix composites to replace traditional superalloys is the best way to improve the temperature resistance of engine combustion chamber components and engine efficiency. [0003] Ceramic matrix composites are a type of composite materials that are composited with ceramics and various fibers. Ceramic matrix composites have excellent properties such as high temperature resistance, high strength, high stiffness, relatively light weight, and corrosi...

AI Technical Summary

Problems solved by technology

Although the fixed structure of the flame tube has basically realized the application and connection of the ceramic matrix composite material on the flame tube of the combustion chamber, the head of the flame tube is still made of metal material, and the temperature resistance of the head of the flame tube has not been improved, and it cannot solve the problem. Positioning and Connection of Flame Tubes Made of All-Ceramic Matrix Composites

[0005] The use of metal materials for the head of the flame tube limits the improvement of the temperature resistance of the head wall. The existing structural scheme cannot realize the positioning and connection of the all-ceramic matrix composite material flame tube; Positional relationship

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