Combustor Liner Dual Wall Cooling Thermal Expansion Management

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Solution Overview

Problem

The existing dual wall cooling structure for combustor liners, where the inner and outer wall forming members are joined via diffusion welding, suffers from decreased maintainability and thermal durability due to thermal expansion differences, leading to excessive thermal stress and crack generation.

Innovation Solution

A combustor liner with a dual wall cooling structure featuring a support guide member that allows free insertion and extraction of plate-shaped inner wall members, absorbing thermal expansion and suppressing excessive thermal stress, while positioning and fixing members maintain clearance and thermal expansion alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the inner wall forming members and outer wall forming member are integrally joined via diffusion welding, then the structural integrity is improved, but the maintainability deteriorates

Engineering Contradiction:

Improvestructural integrityVSAvoidmaintainability

Core Design Contradiction:

StrengthVSEase of repair

Solution Approach 1:

The combustor liner is divided into modular segments: inner wall forming members, outer wall forming members, and joining members that can be independently replaced. This segmentation allows damaged components to be replaced without exchanging the entire liner assembly, resolving the contradiction between structural integrity and maintainability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Joining members serve as intermediary components between inner and outer wall forming members. These joining members can be independently replaced when damaged, allowing maintenance without replacing the entire liner while still providing the necessary structural connection.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If the inner wall forming members and outer wall forming member are integrally joined via diffusion welding, then the structural integrity is improved, but the thermal durability deteriorates

Engineering Contradiction:

Improvestructural integrityVSAvoidthermal durability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The liner is segmented into independent wall forming members connected by joining members, allowing each component to expand and contract independently under thermal stress. This reduces thermal stress concentration and prevents crack propagation, improving thermal durability while maintaining structural integrity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The design explicitly accounts for thermal expansion by providing gaps and flexible joining mechanisms between wall forming members. This allows free thermal expansion of each component without generating excessive thermal stress, thereby improving thermal durability.

Inventive Principle:

Principle #37Thermal expansion

3Stability of the object's composition

If the joining member is used to connect inner and outer wall forming members, then the structural stability is improved, but the thermal stress increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidthermal stress

Core Design Contradiction:

Stability of the object's compositionVSStress or pressure

Solution Approach 1:

The joining members are designed with flexible connection mechanisms that allow dynamic adjustment during thermal cycling. This enables the structure to maintain stability while accommodating thermal expansion and contraction, reducing thermal stress without compromising structural stability.

Inventive Principle:

Principle #15Dynamics

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

This design enhances maintainability by allowing selective repair of inner wall members and improves thermal durability by managing thermal expansion without inhibiting cooling efficiency, resulting in a combustor liner with superior maintainability and thermal performance.

Implementation Method 1

a cooling gas is injected toward and collides with the inner wall section from the impingement cooling holes

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 2

the inner wall section exposed to the combusted gas having the high temperature can be cooled

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

deformation by thermal expansion is able to be absorbed

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS10551067B2Combustor liner with dual wall cooling structure

Publication Date: 2020.02.04 IHI CORP

AI summary

The invention is a combustor liner (12) of a dual wall cooling structure including an inner wall section (30) configured to surround a combustion region (13) and in which a plurality of effusion cooling holes (31) are formed, and an outer wall section (20) formed to be spaced apart from the inner wall section (30) and in which a plurality of impingement cooling holes (21) are formed, wherein the inner wall section (30) is constituted by a plurality of plate-shaped members (40), and a support guide member (50) is provided which is configured to guide the plurality of plate-shaped members (40) to enable free insertion and extraction and support the plurality of plate-shaped members (40) at intervals such that deformation by thermal expansion is able to be absorbed.