Gas Turbine Resonator Cover Impingement Cooling
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Solution Overview
Problem
In gas turbine engines, taller acoustic damping resonators experience diminished impingement cooling effectiveness due to dispersed cooling air, and the upstream welds of these resonators are not adequately cooled, leading to thermal stress issues.
Innovation Solution
A resonator cover with an impingement box and coolant inlet chamber is introduced, which provides direct impingement and film cooling to the upstream welds and liner, optimizing cooling by directing compressed air for enhanced convective and impingement cooling, while maintaining acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resonator height is increased to damp undesired acoustic frequencies, then acoustic performance is improved, but impingement cooling effectiveness deteriorates due to cooling air dispersion
Solution Approach 1:
An impingement box is introduced as an intermediary component between the cooling air source and the resonator/liner interface. This box channels and directs the cooling air flow, ensuring that cooling effectiveness is maintained even when resonator height is increased for acoustic performance. The impingement box acts as a mediator that preserves the thermal management function despite the increased distance and potential for air dispersion.
2Reliability
If resonator height is increased for acoustic damping, then acoustic performance is improved, but thermal protection of upstream welds deteriorates
Solution Approach 1:
The impingement box provides localized cooling specifically targeted at the upstream weld area, which is the most thermally stressed region. By directing cooling air through the impingement box, the solution applies local quality enhancement to the critical weld zone, ensuring thermal protection is maintained even as resonator height increases for acoustic performance.
3Temperature
If cooling air flow is increased to improve thermal protection, then cooling effectiveness is improved, but energy consumption increases
Solution Approach 1:
The impingement box utilizes pneumatic principles to efficiently direct and concentrate cooling air flow where it is most needed. By optimizing the air flow path and pressure distribution within the box, the system achieves effective thermal protection with reduced overall air consumption, addressing the energy efficiency concern while maintaining thermal protection.
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 solution improves thermal protection of the upstream welds and liner by increasing cooling efficiency and uniformity, reducing thermal stresses and maintaining the acoustic performance of the resonators.
Implementation Method 1
A forward impingement cooling hole may be close enough to the forward wall of the impingement box to cool the forward weld by cooling the wall by impingement
Implementation Method 2
The forward impingement cooling hole may be close enough to the forward wall of the impingement box to cool the forward weld by cooling the wall by impingement and by impingement/convective cooling of the liner
Implementation Method 3
Acoustic damping resonators have been used in gas turbine engines to damp undesired acoustic frequencies in the combustion gas during operation of the engines
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
A cover (54, 54A-B) enclosing with clearance (65) an acoustic damping resonator (24) on a working gas path liner (22) of a gas turbine component (28). The cover includes a coolant inlet chamber (56, 56B) with a top wall (58, 58B) that is closer to the liner than a top wall (32) of the resonator, and extends upstream from the resonator relative to the working gas flow (48). Compressed air (26) surrounds the cover at a higher pressure than the working gas and flows (44) into and through the coolant inlet chamber, then through holes (34) in the resonator, then exits through holes (38) the liner into the working gas. The coolant inlet chamber directs the flow of compressed air over a weld (50) of the upstream wall (40) of the resonator to cool it. The cover may be formed as a box (57) or a sleeve (69).