Flame tube with novel cooling structure

Abstract

The invention discloses a flame tube with a novel cooling structure. The flame tube comprises a combustion chamber casing, wherein a flame tube body and a large elbow are arranged in the combustion chamber casing, an inlet diffuser is arranged on one side of the combustion chamber casing, a lap joint section is arranged in the combustion chamber casing and between the flame tube body and the large elbow, an outer ring main combustion mixing hole is formed in an outer ring of the flame tube body, a head swirler mounting hole is formed in a head ring of the flame tube body, an inner ring main combustion mixing hole is formed in an inner ring of the flame tube body, the flame tube body comprises the outer ring, the head ring, the inner ring and a small elbow, the outer ring, the head ring, the inner ring and the small bent pipe of the flame tube body are of an integrated structure, and zigzag small-aperture circular cooling channels are formed in the wall faces of the outer ring, the head ring, the inner ring and the small elbow of the flame tube body and the wall face of the large elbow respectively, so that the number of holes formed in the wall faces is greatly reduced, cracks of the holes are reduced, and the service life of the flame tube body is prolonged.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, in particular to a flame tube with a novel cooling structure. Background technique [0002] With the continuous improvement of the thrust-to-weight ratio (power-to-weight ratio) of aero-engines, the aero-engine combustors will develop in the direction of high temperature rise and high heat capacity in the future, and the thermal protection problem of the combustors will become increasingly severe. On the one hand, the high-temperature combustion chamber requires a substantial increase in the proportion of air involved in combustion, and the amount of air available for cooling will inevitably decrease; on the other hand, in order to improve the engine cycle efficiency and reduce fuel consumption, the boost ratio of the compressor will also be greatly increased. The temperature at the combustion chamber inlet increases, which in turn reduces the cooling potential of the cooling air. Under the...

AI Technical Summary

Problems solved by technology

[0008] (1) These types of cooling structures need to process hundreds of thousands of cooling hole structures at different positions on the surface of the flame tube. The wall of the cooling hole is thin and easy to form stress concentration, which is one of the causes of cracks in the flame tube ;

[0009] (2) The existing cooling structures all require a large amount of cooling air, and basically most of the air is only used to cool the wall of the flame tube, and does not participate in the combustion organization inside the flame tube, and only a small part of the air can be used to adjust the outlet temperature field distribution, resulting in a large amount of waste of gas volume, which cannot meet the gas volume requirements of the participating tissues. As the temperature rises and the oil-gas ratio increases, the gas volume demand for combustion gradually increases, and the gas volume used for cooling is increasing. The existing structure is difficult to meet the demand to a certain extent

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