Airfoil Rod Segmentation for Cooling Channel Management
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Solution Overview
Problem
Gas turbine engines face inefficiencies due to the need for compressor bleed cooling, which compromises engine efficiency by relying on pressure differential, and there is a challenge in enhancing thermal resistance at high-temperature components like turbine inlets.
Innovation Solution
The airfoil design incorporates a core structure with spaced rods forming part of the airfoil profile, creating a gap for cooling channels and using dissimilar materials like ceramic and metal for enhanced thermal resistance, with staggered and circuitous rod arrangements for improved cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If compressor bleed cooling is used to cool high-temperature components, then thermal resistance is improved, but engine efficiency deteriorates due to reliance on pressure differential
Solution Approach 1:
The airfoil is segmented into a core structure and multiple discrete rods arranged in spaced rows. This segmentation creates numerous individual cooling channels between the rods and core structure, allowing distributed cooling throughout the airfoil section without requiring compressor bleed air, thus maintaining engine efficiency while providing effective thermal management.
Solution Approach 2:
The arrangement of spaced rods creates a porous-like structure with multiple channels and gaps. This porous configuration allows coolant to flow through numerous pathways, significantly increasing the cooling surface area and effectiveness without compromising engine performance or requiring additional compressor bleed.
2Strength
If rods are placed directly against the core structure, then structural support is improved, but cooling efficiency deteriorates due to blocked cooling channels
Solution Approach 1:
The rods are positioned close to the core structure but maintain a deliberate gap rather than direct contact. This partial support approach provides sufficient structural stability while preserving the essential cooling channels, achieving the optimal balance between structural integrity and thermal management without excessive spacing that would compromise strength.
3Ease of manufacture
If rods are arranged in a simple linear pattern, then manufacturing is simplified, but cooling performance deteriorates due to lack of circuitous flow paths
Solution Approach 1:
The rods are arranged in staggered rows rather than simple linear alignment, creating asymmetric patterns that generate circuitous cooling flow paths. This asymmetric arrangement enhances cooling performance by increasing flow path length and turbulence while maintaining relatively simple manufacturing processes through standardized rod positioning patterns.
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 reduces the need for compressor bleed cooling and enhances thermal resistance, improving engine efficiency by effectively managing temperature exposure and airflow.
Implementation Method 1
The core structure includes cooling holes that open to the gap... the channels are circuitous
Implementation Method 2
using dissimilar materials like ceramic and metal for enhanced thermal resistance, with staggered and circuitous rod arrangements for improved cooling
Data Source
AI summary
An airfoil includes an airfoil section defining an airfoil profile, the airfoil section including a core structure and a plurality of rods disposed adjacent the core structure.