Combustion Liner Assembly With Floating CMC Tile Attachment
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Solution Overview
Problem
The differing thermal conductivities and expansion rates between metallic combustion liners and ceramic matrix composite (CMC) liner tiles in gas turbine engines lead to stress and potential failure of connection points due to mismatched thermal expansion.
Innovation Solution
The connection devices allow for relative radial and axial movement between the metallic liners and CMC tiles, incorporating features like guide rails, seals, and fasteners to accommodate thermal expansion, reducing stress on fasteners and enhancing the connection durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CMC liner tiles are coupled to metallic combustion liners, then heat shield protection is improved, but stress and potential failure occur due to mismatched thermal expansion
Solution Approach 1:
The connection device incorporates a spring mechanism that allows dynamic adjustment and movement to accommodate differential thermal expansion between the CMC liner tile and metallic combustion liner. The spring enables the assembly to expand and contract differently for each material type, preventing stress buildup and potential failure at the connection point while maintaining secure attachment.
2Stability of the object's composition
If rigid connection is used between liner tiles and liners, then structural stability is improved, but thermal expansion mismatch causes stress and failure
Solution Approach 1:
The connection device changes the mechanical parameters of the connection by introducing a spring mechanism that allows for movement and flexibility. This transforms the connection from a rigid, fixed-parameter joint to a dynamic, adjustable joint that can accommodate thermal expansion differences, thereby maintaining both structural stability and connection reliability under thermal cycling conditions.
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 effectively manages thermal expansion differences, reducing stress on fasteners and improving the longevity and reliability of the combustion liner assembly by allowing for relative movement between the metallic and ceramic components.
Implementation Method 1
a ceramic matrix composite (CMC) liner tile configured to provide a heat shield for the metal liner
Implementation Method 2
The differing thermal conductivities and expansion rates between metallic combustion liners and ceramic matrix composite (CMC) liner tiles lead to stress and potential failure of connection points due to mismatched thermal expansion
Data Source
AI summary
A combustion liner assembly includes metal liner having a hot side and a cold side, a ceramic matrix composite (CMC) liner tile configured to provide a heat shield for the metal liner, the CMC liner tile having a different thermal conductivity than the metal liner, and a connection device configured to attach the CMC liner tile to the metal liner. The connection device accommodates the different thermal conductivity of the CMC liner tile and the metal liner. The connection device is free from a radial fastener exposed to hot gases on the hot side of the metal liner, and the connection device allows radial movement and axial movement between the metal liner and the CMC liner tile.