Non-Rectangular Resonator Film Cooling for Gas Turbine Combustion
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Solution Overview
Problem
Existing gas turbine engine resonators are inefficient in providing cooling to intervening strips and weld seams between adjacent resonators, leading to uneven cooling and potential thermal stress, which can result in component failure due to high-frequency pressure oscillations.
Innovation Solution
Non-rectangular resonators with lateral walls angled at non-right angles relative to the liner's longitudinal axis, providing film cooling to substantial portions of intervening strips and weld seams, and optionally featuring a staggered arrangement of apertures for more uniform cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If rectangular resonators are used with standard configuration, then the resonator structure is simple and easy to manufacture, but the cooling efficiency for intervening strips and weld seams is insufficient leading to uneven cooling
Solution Approach 1:
The patent applies asymmetry by changing the resonator geometry from a standard rectangular configuration to a non-rectangular configuration where at least one lateral wall is angled relative to the longitudinal axis. This asymmetric design allows the resonator to provide film cooling to substantial portions of the intervening strips and weld seams between adjacent resonators, thereby improving cooling efficiency and thermal management without significantly complicating the manufacturing process
2Volume of moving object
If resonators are positioned close to each other to reduce space, then the engine size is reduced, but the intervening strips and weld seams between resonators experience inadequate cooling leading to thermal stress
Solution Approach 1:
The non-rectangular resonator configuration with angled lateral walls is specifically designed to improve cooling coverage in the spaces between adjacent resonators. This asymmetric geometry enables the resonators to be positioned closer together while still providing adequate film cooling to the intervening strips and weld seams, thus reducing overall engine size without compromising thermal stress resistance and reliability
Solution Approach 2:
The patent utilizes fluid dynamics principles by implementing film cooling through the resonator structure. Coolant fluid is directed along the angled lateral walls to create a protective film that covers the intervening strips and weld seams, providing thermal protection in the gaps between closely positioned resonators and preventing thermal stress-related failures
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
Enhances cooling efficiency for intervening strips and weld seams, reducing the risk of thermal stress and component failure by ensuring consistent film cooling across the resonator regions, thereby improving the overall performance and reliability of gas turbine engines.
Implementation Method 1
providing film cooling to substantial portions of intervening strips and weld seams between adjacent resonators
Data Source
Figure 1A~1C
Figure 1B
Figure 1D~3
AI summary
Embodiments of the present invention provide resonators (260, 460) that have lateral walls (268, 270) disposed at non-square angles relative to the liner's longitudinal (and flow-based) axis (219) such that a film cooling of substantial portions of an intervening strip (244, 444) is provided from apertures (226A, 226B, 426) in a resonator box (262, 462) adjacent and upstream from the intervening strip (244, 444). This film cooling also cools weld seams (280) along the lateral walls (268, 270) of the resonator boxes (262, 462). In various embodiments the lateral wall angles are such that film cooling may be provided to include the most of the downstream portions of the intervening strips (244, 444). These downstream portions are closer to the combustion heat source and therefore expected to be in greater need of cooling.