Composite Guide Vane Attachment Stress Distribution
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Solution Overview
Problem
Conventional composite guide vanes in gas turbine structures face challenges with stress concentration at attachment points, leading to potential stiffness issues and adverse effects on aerodynamic properties and weight.
Innovation Solution
A composite guide vane design with a widened first attachment portion, featuring a specific chord length ratio and strategically located openings, utilizes a composite material for the cover portion and a structural core material, ensuring appropriate stiffness and strength while minimizing aerodynamic and weight impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the guide vane is attached to the housing using conventional methods with openings at the corners, then the attachment is achieved, but large stresses concentrate at the corners leading to potential stiffness issues
Solution Approach 1:
The guide vane features a widened first attachment portion at the leading end with a chord length greater than 0.5 times the maximum chord length, creating a localized region with enhanced structural properties. This local quality change distributes stresses more evenly across the attachment area rather than concentrating them at corner points, while the opening in this widened portion maintains attachment functionality with reduced stress concentration.
2Strength
If the guide vane width is increased at the attachment portion to improve strength, then local strength increases, but aerodynamic properties may be adversely affected
Solution Approach 1:
The widening of the guide vane is localized specifically to the first attachment portion at the leading end, where the chord length exceeds 0.5 times the maximum chord length. This localized geometric modification concentrates the strength enhancement where attachment stresses occur, while the rest of the guide vane maintains its original aerodynamic contour, thereby minimizing adverse effects on aerodynamic performance.
Solution Approach 2:
The opening in the widened first attachment portion is configured with an extension direction forming an angle between 0-30 degrees relative to the guide vane direction. This angular orientation of the opening creates an optimized stress distribution pattern that simultaneously satisfies both structural strength requirements and aerodynamic flow requirements, resolving the contradiction between local strength and aerodynamic performance.
3Stability of the object's composition
If the guide vane width is increased at the attachment portion, then stiffness improves, but weight increases
Solution Approach 1:
The guide vane incorporates a widened first attachment portion only at the leading end where attachment to the housing occurs, with the chord length at this portion exceeding 0.5 times the maximum chord length of the guide vane. This localized widening concentrates the stiffness enhancement precisely where structural support is needed for attachment, while the remaining portions of the guide vane maintain their original dimensions, thereby minimizing additional weight.
Solution Approach 2:
The opening in the widened first attachment portion extends in a direction forming an angle between 0-30 degrees relative to the guide vane direction, with the opening positioned at a specific distance from the leading end (between 0.05-0.2 times the guide vane length). This geometric configuration optimizes the stiffness-to-weight ratio by distributing material efficiently in the critical attachment region while avoiding unnecessary weight addition in non-critical areas.
Data Source
AI summary
A composite guide vane for a gas turbine structure is adapted to extend in a guide vane direction from a first housing towards a second housing of the gas turbine structure. The guide vane includes a guide vane length in the guide vane direction and the guide vane includes a first attachment portion with at least one first opening for attachment of the guide vane to the first housing. The first opening extends in a first opening direction which forms an angle with the guide vane direction. The guide vane includes a cover portion including a first material and a core portion which is at least partially enclosed by the cover portion.