Structure and method for suppressing thermoacoustic oscillations in a gas turbine combustor

By using an inner and outer tube to form a back cavity structure in the gas turbine burner, combined with acoustic holes and cooling holes, a resonance system is constructed to absorb the acoustic energy of thermoacoustic oscillations, thus solving the problem of thermoacoustic oscillations in the burner and improving stability and safety.

CN117029045BActive Publication Date: 2026-02-17DONGFANG TURBINE CO LTD
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Patent Information

Application Number
CN202311042467.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-18
Publication Date
2026-02-17
Estimated Expiration
2043-08-18

AI Technical Summary

Technical Problem

In the existing technology, the thermoacoustic oscillation problem of gas turbine combustors has not been effectively suppressed, leading to component erosion, accelerated fatigue, and unsafe operation.

Method used

An inner tube and an outer tube are used to form a back cavity structure, and an acoustic hole is set on the inner tube to form a resonance system. The acoustic energy of thermoacoustic oscillation is absorbed and consumed through the acoustic damping system composed of the acoustic hole and the back cavity. At the same time, the absorption effect is enhanced by cooling and deflection of cold flow.

Benefits of technology

It effectively suppresses the thermal and acoustic vibrations of gas turbine combustors, improves operational stability and safety, and enhances cooling performance.

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Abstract

The application discloses a structure and method for inhibiting thermal acoustic oscillation of a gas turbine combustor, relates to the field of inhibiting thermal acoustic oscillation of a gas turbine combustor, and is applied to a combustor and comprises an outer layer pipe and an inner layer pipe, wherein the inner layer pipe is located in the outer layer pipe and the inner layer pipe and the outer layer pipe are coaxial; a back cavity is formed between the inner layer pipe and the outer layer pipe; a plurality of acoustic holes are arranged on the inner layer pipe and the acoustic holes are communicated with the back cavity; the space corresponding to the acoustic holes in the back cavity is a resonance cavity; and each acoustic hole and the resonance cavity form a resonance system. The application can effectively inhibit thermal acoustic oscillation of the gas turbine combustor and reduce the influence caused by the thermal acoustic oscillation.
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