Polymeric Shroud Bonded to Metallic Airfoil Fitting
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Solution Overview
Problem
Conventional shrouded airfoils in gas turbine engines face challenges in material compatibility and efficiency due to the need for integrally formed metallic shrouds and fittings, which are costly and require significant machining, limiting material options and geometric flexibility.
Innovation Solution
The use of polymeric shrouds, which can be separately formed and assembled around metallic fittings, allowing for different material choices and easier geometric configuration, along with the integration of seal members for enhanced sealing and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If integrally formed metallic shrouds and fittings are used, then structural integrity is ensured, but manufacturing cost increases and material flexibility decreases
Solution Approach 1:
The airfoil assembly is divided into separate components: a metallic fitting and a polymeric shroud, which are assembled together rather than formed as a single integral piece. This segmentation allows each component to be manufactured independently using optimal processes for each material, reducing overall manufacturing cost and complexity while maintaining structural integrity through the assembled connection.
Solution Approach 2:
The invention employs a composite structure combining metallic fitting material with polymeric shroud material. This composite approach leverages the strengths of both materials - the metallic fitting provides structural strength and rigidity, while the polymeric shroud provides sealing and corrosion resistance, achieving optimal performance at lower cost than all-metallic integral construction.
2Strength
If integrally formed metallic shrouds are used, then structural integrity is ensured, but manufacturing complexity increases due to significant machining requirements
Solution Approach 1:
By segmenting the airfoil assembly into separate metallic fitting and polymeric shroud components, the manufacturing process is simplified. Each component can be manufactured using less complex processes appropriate to its material and function, avoiding the significant machining operations required for integral metallic shrouds while maintaining structural integrity through the assembled configuration.
Solution Approach 2:
The polymeric shroud acts as an intermediary component between the metallic fitting and the gas path environment. This intermediary element provides sealing and protective functions that would otherwise require complex machining of the metallic fitting, thereby reducing manufacturing complexity while maintaining structural and functional integrity.
3Strength
If integrally formed metallic shrouds are used, then structural integrity is ensured, but material flexibility decreases
Solution Approach 1:
The composite structure combining metallic and polymeric materials provides material flexibility by allowing selection of optimal materials for each component's specific requirements. The metallic fitting provides structural strength, while the polymeric shroud provides corrosion resistance and sealing capabilities, enabling adaptation to different service conditions and design requirements.
Solution Approach 2:
Segmenting the airfoil assembly into separate metallic and polymeric components enables independent material selection and optimization for each part. This segmentation provides versatility in material choice, allowing engineers to select from a broader range of materials with different properties to meet specific performance, environmental, and cost requirements for different applications.
Data Source
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AI summary
An airfoil includes an airfoil body that extends between a leading edge and a trailing edge, a suction side and a pressure side, and a first end and a second end. At least one fitting is located on at least one of the first end and the second end. The fitting includes at least one mounting lug. At least one shroud is adhesively bonded to the at least one fitting.