Curved Combustion Chamber Shingle Edge Design
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Solution Overview
Problem
Combustion chamber shingles in gas turbine engines often experience vibration due to inadequate attachment, leading to potential fatigue failure, which is costly and requires additional attachment elements to mitigate, increasing complexity and cost.
Innovation Solution
The combustion chamber shingle is designed with a curved edge that differs in curvature from the combustion chamber wall in specific sections, allowing for a minimum clamping force abutment during operation, preventing vibration and reducing reaction forces, thus enhancing attachment stability without additional elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional attachment elements are provided to press the combustion chamber shingle against the combustion chamber wall, then vibration is reduced, but device complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by modifying the curvature radius of the shingle edge relative to the combustion chamber wall. By designing the shingle edge with a different curvature radius than the combustion chamber wall, the patent creates a geometric interference that generates pressing force, eliminating the need for additional attachment elements while ensuring reliable contact and reducing vibration.
2Ease of manufacture
If the shingle edge follows the contour of the combustion chamber wall, then mounting is simplified, but vibration occurs due to inadequate contact pressure
Solution Approach 1:
The patent applies local quality by creating a localized geometric difference at the shingle edge. While most of the shingle may follow the general contour of the combustion chamber wall for ease of mounting, the critical shingle edge is designed with a specific curvature radius that differs from the wall, creating localized pressing force where needed to prevent vibration without complicating the overall mounting process.
Data Source
AI summary
A combustion chamber assembly group, and a mounting method therefor, includes a combustion chamber for an engine that includes a curved combustion chamber wall extending along two spatial directions, and a combustion chamber shingle affixed at an inner side of the combustion chamber wall and having a shingle edge defining the outer contour of the shingle. For an at least sectional abutment of the shingle edge at the combustion chamber wall with a minimum clamping force in an operational state of the engine, the shingle is mounted to the combustion chamber wall in a mounting state in which the shingle at least at one section of the shingle edge has a curvature with respect to at least one of the spatial directions that differs from the curvature of the combustion chamber wall with respect to this spatial direction.