Multicavity Turbine Engine Dampers for Multi-Frequency Instability
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Solution Overview
Problem
Turbine engines face challenges in effectively damping combustion instability, which can cause sinusoidal pressure fluctuations with large amplitudes that damage equipment, as existing single-cavity dampers can only target a single frequency of instability.
Innovation Solution
The implementation of a multicavity damper with multiple cavity volumes of unique lengths to broaden the range of frequencies damped, allowing for customized acoustic attenuation characteristics to target and damp both low and high frequency tones independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-cavity damper is used, then the device complexity is low, but the frequency range damped is limited to a single frequency
Solution Approach 1:
The damper is divided into multiple cavities (first cavity and second cavity) with different lengths, allowing each cavity to target different frequency ranges. This segmentation enables the damper to handle multiple frequencies simultaneously while maintaining a relatively simple overall structure.
Solution Approach 2:
The multicavity damper performs multiple functions by targeting both low frequency and high frequency tones simultaneously with a single device. The first cavity targets low frequency while the second cavity targets high frequency, making the damper universally applicable to multiple frequency ranges.
2Adaptability or versatility
If multiple dampers are used to target different frequencies, then the frequency range damped is broadened, but the device complexity and number of components increase
Solution Approach 1:
Multiple damper cavities are merged into a single damper assembly that can be installed as one component. The first cavity and second cavity are combined in one damper structure, allowing the system to dampen multiple frequencies without requiring multiple separate damper units.
Solution Approach 2:
The single damper assembly performs multiple functions by incorporating cavities that target different frequency ranges. This multi-functional design eliminates the need for multiple separate dampers while maintaining broad frequency attenuation capability.
3Reliability
If a single-cavity damper is used, then the manufacturing complexity is low, but the acoustic performance for multi-frequency suppression is insufficient
Solution Approach 1:
The damper is segmented into multiple cavities with different lengths, each optimized for specific frequency ranges. This segmentation improves acoustic performance for multi-frequency suppression while maintaining manufacturing feasibility through modular cavity design.
Solution Approach 2:
The lengths of the cavities are varied to optimize acoustic performance for different frequency ranges. By changing the geometric parameters (lengths) of the cavities, the damper achieves superior multi-frequency damping while remaining manufacturable.
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
The multicavity damper effectively dampens multiple frequencies, providing broader attenuation and suppressing multi-tonal behavior in the combustion chamber with a single damper, enhancing the acoustic performance and reducing equipment damage.
Implementation Method 1
a multicavity damper in fluid communication with the combustion chamber to dampen an instability generated in the combustion chamber by the combustion products
Implementation Method 2
The multicavity damper effectively dampens multiple frequencies, providing broader attenuation and suppressing multi-tonal behavior in the combustion chamber
Data Source
AI summary
A gas turbine engine includes a compressor section for compressing air flowing therethrough to provide a compressed air flow, a combustor including a combustion chamber, the combustion chamber configured to combust a mixture of a fuel flow and the compressed air flow to generate combustion products, and a turbine section having at least one turbine driven by the combustion products. The gas turbine engine includes a multicavity damper in fluid communication with the combustion chamber to dampen an instability generated in the combustion chamber by the combustion products. The multicavity damper has a plurality of cavity volumes and the length of each cavity volume is different.