CMC Airfoil Cooling via Intermediary Support Piece
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Solution Overview
Problem
Ceramic matrix composite (CMC) airfoils in turbine engines face thermal distress due to excessive thermal loading, necessitating effective cooling systems to distribute heat evenly and prevent deformation under mechanical stress.
Innovation Solution
An airfoil design featuring a CMC body with an inner chamber and a support piece having a channel that forms a passageway for cooling fluid, allowing for even heat distribution and release through outlets on the outer surface, thereby minimizing temperature gradients and enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If CMC material is used for airfoils to reduce weight and increase temperature resistance, then the airfoil can operate at higher temperatures, but the CMC body becomes vulnerable to thermal distress under excessive thermal loading
Solution Approach 1:
A support piece made of thermally conductive material (such as metallic alloy) is introduced as an intermediary between the CMC body and the cooling system. This support piece has a channel formed in its surface, which contacts the inner surface of the CMC body to define a passageway for cooling fluid. The support piece mediates heat transfer from the CMC body to the cooling fluid, protecting the CMC material from excessive thermal loading while enabling high-temperature operation
2Reliability
If cooling systems are added to CMC airfoils to remove excessive heat, then thermal distress is reduced, but the structural support and heat distribution efficiency may be compromised
Solution Approach 1:
The support piece serves multiple functions simultaneously: it provides structural support to the CMC body, acts as a thermal conduit to distribute heat evenly across the airfoil profile, and forms part of the cooling system by defining the passageway for cooling fluid. This multi-functional design achieves cooling without compromising structural integrity or heat distribution efficiency
3Temperature
If cooling channels are integrated into the CMC body, then heat removal is improved, but the manufacturing complexity and structural integrity of the CMC body are reduced
Solution Approach 1:
The cooling system is segmented into separate functional components: the CMC body maintains its structural integrity, while the support piece (a separate component) contains the cooling channel. This segmentation allows the CMC body to be manufactured without complex internal cooling passages, simplifying its fabrication, while the support piece is designed specifically to provide the cooling function through its channel structure
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 enables airfoils to operate at higher temperatures by evenly distributing heat across the CMC body, reducing thermal gradients and enhancing durability, while maintaining structural support and efficient cooling.
Implementation Method 1
The channel and the inner surface of the CMC body define a passageway for a cooling fluid... evenly distributing heat across the CMC body, reducing thermal gradients
Implementation Method 2
The support piece comprises a channel in a surface of the support piece... define a passageway for a cooling fluid... allowing for even heat distribution and release through outlets
Data Source
AI summary
An airfoil may be provided that includes a CMC body and a support piece. The CMC body has an inner surface that defines a chamber within the CMC body. The support piece may be positioned within the chamber of the CMC body. The support piece comprises a channel in a surface of the support piece, the surface being in contact with the inner surface of the CMC body. The channel and the inner surface of the CMC body define a passageway for a cooling fluid. The passageway may wind about the circumference of the CMC body and extend along the span of the airfoil. Outlets may be positioned through the CMC body allowing fluid communication between the passageway and the outer surface of the CMC body.