Ceramic Matrix Composite Panel Attachment to Gas Turbine Liner
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Solution Overview
Problem
Attaching ceramic matrix composite materials to metal liners in gas turbine engines is challenging due to their brittleness, requiring a secure yet non-fracturing attachment method to withstand high temperatures.
Innovation Solution
A combined liner and panel system where ceramic matrix composite panels have extending members that are biased away from the hot products of combustion by spring members, which are integrated into the liner with apertures and spring rings to create a bias force, ensuring secure attachment without excessive stress on the composite material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic matrix composite panels are attached directly to metal liners using rigid fastening methods, then strong attachment is achieved, but the brittle composite material may fracture under thermal stress
Solution Approach 1:
The patent applies spring members that provide a dynamic, elastic attachment mechanism instead of rigid fastening. The spring members can deflect and absorb thermal expansion stresses, maintaining attachment strength while preventing fracture of the brittle ceramic matrix composite material under high-temperature thermal cycling conditions
Solution Approach 2:
The patent changes the mechanical parameters of the attachment system by using compliant spring members with specific force characteristics. The spring members are designed to exert a controlled biasing force that secures the panel to the liner while accommodating thermal expansion, thereby resolving the contradiction between strong attachment and fracture prevention
2Reliability
If spring members are used to bias extending members away from hot products of combustion, then thermal stress management is improved, but device complexity increases
Solution Approach 1:
The patent segments the attachment system into modular components: extending members on the panel, spring members for biasing, and liner structures with apertures. This segmentation allows each component to be optimized independently for its specific function while managing thermal stress, balancing reliability improvement with acceptable device complexity
Solution Approach 2:
The spring members are received within apertures in the liner, creating a nested structure where the spring members fit into recesses or holes in the liner. This nesting approach consolidates the attachment system into a compact configuration, managing thermal stress through the spring biasing action while minimizing the overall complexity and space requirements of the attachment system
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 provides a secure attachment of ceramic matrix composite panels to metal liners in gas turbine engines, effectively managing the thermal stress and preventing fracture while maintaining structural integrity under high-temperature conditions.
Implementation Method 1
A liner includes a plurality of spring members that apply a bias force biasing the extending members. The spring members bias the extending members on the panel in a direction away from the face of the panel which will face the hot products of combustion.
Data Source
AI summary
A combined liner and panel for use in a gas turbine engine comprise a ceramic matrix composite panel having a plurality of extending members extending away from a face of ceramic matrix composite panel which will face hot products of combustion. A liner includes a plurality of spring members that apply a bias force biasing the extending members. The spring members bias the extending members on the panel in a direction away from the face of the panel which will face the hot products of combustion. A gas turbine engine, and a method of attaching a ceramic matrix composite panel to a liner are also disclosed.