Segmented Acoustic Liner for Gas Turbine Combustion Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing combustor damping devices face challenges in effectively suppressing combustion vibration due to the division of the acoustic-liner resonant space in the circumferential direction, which reduces the vibration suppression performance of the acoustic liner.
Innovation Solution
A damping device is designed with an acoustic liner that includes a divided portion and a continuous portion along the outer periphery of the internal flow path, where the damper opening connects the acoustic-liner resonant space with the acoustic-damper resonant space, allowing for effective communication and vibration damping by both the acoustic liner and damper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the acoustic-liner resonant space is divided in the circumferential direction to accommodate the damper opening, then the acoustic damper can suppress vibration, but the vibration suppression performance of the acoustic liner decreases
Solution Approach 1:
The acoustic liner is divided into a divided portion and a continuous portion along the circumferential direction. The divided portion allows the acoustic-liner resonant space to communicate with the acoustic-damper resonant space through the damper opening, while the continuous portion maintains the integrity of the acoustic-liner resonant space for effective vibration suppression.
Solution Approach 2:
Different portions of the acoustic liner are assigned different functions: the divided portion facilitates communication between resonant spaces for damping, while the continuous portion provides uninterrupted vibration suppression performance. This local differentiation resolves the contradiction by optimizing each region for its specific purpose.
2Reliability
If a damper opening is formed to connect the acoustic-liner resonant space and acoustic-damper resonant space, then the acoustic damper can function effectively, but the acoustic liner is divided and its vibration suppression capability is reduced
Solution Approach 1:
The acoustic liner is segmented into divided and continuous portions along the circumferential direction, allowing the damper opening to be positioned in the divided portion without compromising the continuous portion's integrity and vibration suppression capability.
Solution Approach 2:
The acoustic liner exhibits different structural qualities in different regions: the divided portion accommodates the damper opening for acoustic communication, while the continuous portion maintains full integrity for optimal vibration suppression, thus resolving the strength-integrity contradiction.
3Reliability
If the acoustic liner is made continuous to improve vibration suppression, then the vibration suppression performance improves, but the acoustic damper cannot communicate with the acoustic-liner resonant space
Solution Approach 1:
The acoustic liner is segmented into divided and continuous portions, where the divided portion enables communication between resonant spaces through the damper opening, while the continuous portion ensures vibration suppression performance.
Solution Approach 2:
Different regions of the acoustic liner are optimized for different functions: the divided portion facilitates acoustic communication for damper operation, while the continuous portion provides uninterrupted vibration suppression, thus resolving the contradiction between communication ease and vibration suppression performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the vibration suppression performance of the acoustic liner while maintaining the effectiveness of the acoustic damper, effectively damping combustion vibrations and improving the service life of the gas turbine by reducing the load caused by combustion vibrations.
Implementation Method 1
an acoustic liner that forms an acoustic-liner resonant space along an outer periphery of an internal flow path in which a fluid flows
Implementation Method 2
an acoustic damper provided on an outer peripheral side of the acoustic liner, to form an acoustic-damper resonant space that communicates with the acoustic-liner resonant space
Implementation Method 3
enabling to damp vibration by a fluid circulating in the internal flow path by the acoustic damper
Data Source
AI summary
To provide a damping device that includes an acoustic liner that forms an acoustic-liner resonant space along an outer periphery of a combustion chamber in which a combustion gas flows, and an acoustic damper provided on an outer peripheral side of the acoustic liner, to form an acoustic-damper resonant space that communicates with the acoustic-liner resonant space. The acoustic liner is formed with a damper opening connected with the acoustic damper for causing the acoustic-liner resonant space and the acoustic-damper resonant space to communicate with each other. The acoustic liner includes a divided portion that is a portion to be divided in a circumferential direction of the combustion chamber by the damper opening, and a continuous portion that is a portion continuous over the circumferential direction of the combustion chamber.