Cold Spray Leading Edge Sheath for Fan Blades
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Solution Overview
Problem
Existing methods for protecting the leading edges of fan blades and rotor blades from foreign object impacts and erosion, such as bird strikes, often result in galvanic corrosion and limitations in heat treatment due to direct material bonding, and are inefficient in manufacturing complex shapes.
Innovation Solution
A method involving the formation of a metallic sheath using a cold spray process on mandrels, with a skrim sheet for separation and heat treatment, providing a dense, strong, and erosion-resistant protection while avoiding galvanic corrosion, and allowing for lightweight materials with improved aerodynamic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic sheath is directly bonded to the leading edge of an airfoil, then protection from foreign object impact and erosion is achieved, but galvanic corrosion occurs between the sheath and the airfoil material
Solution Approach 1:
The patent introduces an intermediate layer between the metallic sheath and the airfoil leading edge. This intermediate layer acts as a mediator that prevents direct contact between dissimilar metals, thereby eliminating galvanic corrosion while maintaining the protective function of the sheath against foreign object impact and erosion.
2Reliability
If traditional manufacturing methods are used to form sheaths, then protection is provided, but manufacturing complex shapes is inefficient and time-consuming
Solution Approach 1:
The patent employs additive manufacturing technology to form the metallic sheath, representing a fundamental change in the manufacturing parameter from traditional subtractive or assembly methods. This enables efficient production of complex three-dimensional shapes that would be difficult or time-consuming to manufacture using conventional methods, while maintaining the protective integrity of the sheath.
3Strength
If heavy materials are used for the sheath, then strength and erosion resistance are improved, but the overall weight of the blade increases
Solution Approach 1:
The patent applies the metallic sheath specifically to the leading edge region of the airfoil where impact and erosion protection is most critical, rather than covering the entire blade. This localized application provides the necessary strength and erosion resistance at the high-stress leading edge while minimizing the additional weight that would result from sheathing the entire blade structure.
Solution Approach 2:
The patent creates a composite structure by bonding a metallic sheath to the airfoil leading edge, combining the erosion and impact resistance properties of the metal with the aerodynamic properties of the airfoil material. This composite approach optimizes the protective function while managing the overall weight characteristics of the blade assembly.
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 method achieves enhanced strength, stiffness, and erosion resistance for leading edges, enabling the use of lightweight materials with optimal performance under impact and erosion conditions, while preventing galvanic corrosion and simplifying the manufacturing process.
Implementation Method 1
A method involves forming a sheath using a cold spray process on mandrels
Implementation Method 2
providing a dense, strong, and erosion-resistant protection while avoiding galvanic corrosion
Implementation Method 3
with a skrim sheet for separation and heat treatment
Data Source
Figure 1
Figure 2A
Figure 2B~2C
AI summary
A method of forming a leading edge protection component includes depositing particles using a cold spray process on a mandrel to form a leading edge protection component; and removing the leading edge protection structure from the mandrel. The leading edge protection can be formed in one or more pieces and involve using one or more mandrels.