Multi-Cavity Acoustic Liner for Gas Turbine Combustion Damping
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Solution Overview
Problem
Conventional acoustic liners in gas turbines are limited in damping multiple combustion oscillation modes with different frequencies due to installation space and cost constraints, as they are designed for a single tuning frequency.
Innovation Solution
A combustor design featuring a first acoustic device with multiple tuning frequencies, achieved by a configuration of first and second casing portions with strategically positioned openings and spaces, allowing communication between them, and optionally a second acoustic device, to effectively damp a range of combustion oscillation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single acoustic liner is used, then the device complexity and installation cost are reduced, but the ability to damp multiple combustion oscillation modes with different frequencies is limited
Solution Approach 1:
The acoustic liner is designed with multiple cavities having different depths, allowing a single liner to damp multiple combustion oscillation modes with different frequencies. Each cavity acts as an independent Helmholtz resonator tuned to a specific frequency, enabling one component to perform multiple damping functions simultaneously.
Solution Approach 2:
The acoustic liner incorporates multiple cavities nested within the same structural component. The cavities are arranged such that they occupy different spatial positions and depths within the liner, allowing each cavity to target different frequency ranges while sharing the same installation space.
2Adaptability or versatility
If multiple acoustic liners are provided to damp different combustion oscillation modes, then the adaptability to damp multiple modes is improved, but the installation space and costs increase
Solution Approach 1:
Multiple acoustic liners targeting different frequency ranges are merged into a single integrated liner structure. The multiple cavities are combined within one liner component, consolidating what would have been separate installation units into one space-efficient solution.
Solution Approach 2:
The acoustic liner utilizes the depth dimension by creating cavities at different depths within the same liner structure. This vertical dimensionality allows multiple tuning frequencies to be achieved without increasing the lateral footprint or installation space requirements.
3Adaptability or versatility
If multiple acoustic liners are provided to damp different combustion oscillation modes, then the adaptability to damp multiple modes is improved, but the installation cost increases
Solution Approach 1:
A single acoustic liner is designed to perform multiple damping functions for different combustion oscillation modes, eliminating the need to purchase and install multiple separate liners. This multi-functionality reduces material costs, installation labor, and maintenance requirements.
Solution Approach 2:
The manufacturing and installation processes for multiple acoustic liners are merged into a single integrated component production and installation operation, reducing overall manufacturing complexity, installation time, and associated costs.
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 enables the damping of multiple combustion oscillation modes with different frequencies, improving operational efficiency and reducing the need for multiple acoustic liners, thereby enhancing the performance of gas turbines.
Implementation Method 1
an acoustic liner which defines a gas space in communication with the inside of the transition piece of the combustor via a vent hole and which is capable of damping combustion oscillation of a predetermined frequency
Implementation Method 2
An acoustic liner is capable of damping combustion oscillation of the tuning frequency or a frequency around the tuning frequency
Data Source
AI summary
A combustor includes: a combustion liner having a first region in which at least one first opening is formed; a nozzle configured to inject a fuel into the combustion liner; and a first acoustic device mounted to the combustion liner. The first acoustic device includes: a first casing portion having at least one first wall disposed facing the first region on an outer side of the combustion liner and at least one second opening formed thereon. The first casing portion defining at least one first space in communication with an inside of the combustion liner through the first opening; and a second casing portion having at least one second wall disposed facing the first wall on an outer side of the first casing portion. The second casing portion defines, between the first wall and the second wall, a second space in communication with the first space through the second opening.