Gas Turbine Strut Shield Collar Lattice Design

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Solution Overview

Problem

The existing strut shield collars in gas turbines are large and thick, leading to slow thermal response and high cycle stress, and are difficult to manufacture using conventional methods.

Innovation Solution

A strut shield collar with a grid type mesh on its inside surface and a collar foot, which reduces mass while maintaining stiffness and provides additional welding points for stiffening, and can be manufactured using conventional casting or additive methods like selective laser melting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the strut shield collar is made large and thick, then strength and stiffness are improved, but thermal response becomes slow and cycle stress increases

Engineering Contradiction:

ImprovestrengthVSAvoidthermal response time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The collar is segmented into a lattice structure composed of multiple interconnected struts rather than a solid thick wall, allowing thermal energy to penetrate through the structure more quickly while maintaining structural integrity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The lattice structure creates a porous configuration that allows thermal energy to pass through more efficiently, improving thermal response time while the strategic arrangement of struts maintains sufficient strength

Inventive Principle:

Principle #31Porous materials

2Strength

If the strut shield collar is made large and thick, then strength is improved, but cycle stress in adjacent components increases

Engineering Contradiction:

ImprovestrengthVSAvoidcycle stress

Core Design Contradiction:

StrengthVSStress or pressure

Solution Approach 1:

The segmented lattice structure distributes thermal and mechanical loads across multiple struts rather than concentrating them in a single thick wall, reducing cycle stress in adjacent components

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The lattice structure functions as a composite configuration combining multiple structural elements that work together to manage stress distribution, achieving strength without excessive stress concentration

Inventive Principle:

Principle #40Composite materials

3Stability of the object's composition

If the strut shield collar is made large and thick, then stiffness is improved, but manufacturing difficulty increases

Engineering Contradiction:

ImprovestiffnessVSAvoidmanufacturing ease

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The lattice structure is designed as modular segments that can be manufactured separately and assembled, significantly improving manufacturing ease compared to creating a single large thick component

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The design transitions from a two-dimensional thick wall to a three-dimensional lattice structure, achieving stiffness through spatial arrangement rather than material thickness alone, enabling easier manufacturing

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS10837316B2High thermal response exhaust diffuser strut collar

Publication Date: 2020.11.17 DOOSAN HEAVY IND & CONSTR CO LTD

AI summary

A strut shield collar can include: a tubular portion including a tubular inside surface and a tubular outside surface; a flange portion extended from the tubular portion toward an outside of the tubular portion and including a flange inside surface; and a grid type mesh formed on at least one of the tubular inside surface and the flange inside surface, wherein the grid type mesh comprises a groove portion and a rib portion, and the groove portion is thinner than the rib portion.