Ceramic Matrix Composite Shroud Attachment Pin Cooling

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Solution Overview

Problem

Coupling ceramic matrix composite components with metallic parts in gas turbine shrouds poses challenges due to material property incompatibilities and high temperature exposure, particularly in turbine environments where ceramic matrix composite materials face difficulties in integration and longevity.

Innovation Solution

A turbine shroud design featuring a metallic carrier segment and a ceramic matrix composite blade track segment, coupled via a mount assembly with a cooling-air distributor bolt that includes multiple discharge passages to actively cool the attachment pin, ensuring effective heat management and longevity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If ceramic matrix composite materials are used in high temperature turbine shroud environments, then temperature resistance is improved, but integration difficulty with metallic parts increases

Engineering Contradiction:

Improvetemperature resistanceVSAvoidintegration difficulty

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

A transition joint is introduced as an intermediary component between the ceramic matrix composite blade track segment and the metallic carrier segment. This transition joint facilitates gradual property transition and simplifies the coupling process, resolving the integration difficulty while maintaining temperature resistance benefits

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The turbine shroud employs a composite structure combining ceramic matrix composite materials for the blade track segment (exposed to high temperatures) with metallic materials for the carrier segment. This composite approach allows each material to be used in its optimal environment, maintaining temperature resistance while managing integration challenges through specialized coupling mechanisms

Inventive Principle:

Principle #40Composite materials

2Temperature

If ceramic matrix composite components are coupled to metallic parts in high temperature environments, then temperature resistance is improved, but component longevity deteriorates

Engineering Contradiction:

Improvetemperature resistanceVSAvoidcomponent longevity

Core Design Contradiction:

TemperatureVSDuration of action of moving object

Solution Approach 1:

The transition joint acts as a protective intermediary that shields the ceramic matrix composite blade track segment from direct thermal and mechanical stress exposure. By distributing and reducing these stresses, the transition joint preserves the longevity of the temperature-resistant ceramic components

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The transition joint provides beforehand cushioning against thermal and mechanical stresses that would otherwise directly affect the ceramic matrix composite components. This protective mechanism is built into the design to prevent premature failure and extend component service life in high temperature environments

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Duration of action of moving object

If active cooling is implemented for attachment pins, then component longevity is improved, but device complexity increases

Engineering Contradiction:

Improvecomponent longevityVSAvoiddevice complexity

Core Design Contradiction:

Duration of action of moving objectVSDevice complexity

Solution Approach 1:

The attachment pin is designed with multi-functionality, serving both as a mechanical fastener and as a cooling air distributor. Cooling air passages are integrated directly into the pin structure, allowing a single component to perform multiple functions and reduce overall device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The cooling air distributor function is merged with the attachment pin structure itself. Cooling air passages are built into the pin, combining the fastening and cooling distribution functions into a single integrated component, thereby extending longevity without proportionally increasing complexity

Inventive Principle:

Principle #5Merging (Combining)

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 heat and extends the lifespan of ceramic matrix composite components by actively cooling the attachment pins, maintaining structural integrity and performance in high-temperature gas turbine environments.

Implementation Method 1

The cooling-air distributor may be configured to discharge cooling air within the attachment pin

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 2

The mount assembly may include an attachment pin comprising metallic materials that extends through the eyelet in the attachment feature of the blade track segment

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS10801350B2Actively cooled engine assembly with ceramic matrix composite components

Publication Date: 2020.10.13 ROLLS ROYCE CORP

AI summary

An actively cooled assembly adapted for use in a gas turbine engine is disclosed herein. In illustrative embodiments, the assembly includes at least one ceramic matrix composite component with an attachment feature.