Propeller Blade Leading-Edge Conduit for Cavitation Suppression
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Solution Overview
Problem
Propeller blades suffer from cavitation issues near the leading edge, leading to noise and potential damage, and existing methods for addressing cavitation through air distribution are complex and costly.
Innovation Solution
A method using wire-based additive manufacturing (WAAM) to create a conduit along the leading edge of propeller blades, which is enclosed by an edge part built up through the process, allowing for a cost-effective and reliable air distribution system that reduces the risk of cracks and maintains structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove is made in the suction side of the blade and closed by welding a cover, then a conduit for air distribution can be created, but the manufacturing complexity increases and the risk of cracks appears
Solution Approach 1:
The blade manufacturing process is segmented into distinct stages: providing a blade blank with an edge part receiving surface, building up the edge part containing the conduit by wire-based additive manufacturing, and making holes through the edge part. This segmentation eliminates the need for groove welding while maintaining conduit functionality, thereby reducing manufacturing complexity and crack risk.
Solution Approach 2:
The traditional mechanical welding process for creating and closing grooves is replaced by wire-based additive manufacturing technology. This substitution enables direct formation of the conduit within the edge part without requiring separate welding operations, thus eliminating the associated complexity and crack risks while maintaining the air distribution function.
2Ease of manufacture
If traditional groove and cover welding technique is used, then a conduit can be formed, but manufacturing cost increases
Solution Approach 1:
The edge part and conduit are merged into a single integrated component manufactured by wire-based additive manufacturing. The conduit is formed within the edge part material itself, eliminating the need for separate groove creation and cover welding operations. This merging reduces manufacturing steps, lowers costs, and maintains structural integrity without introducing weak points from welding.
3Object-affected harmful factors
If pressurized air is blown to suppress cavitation, then cavitation damage is reduced, but the blade requires a complex duct system
Solution Approach 1:
The air distribution system is localized to the edge part at the leading edge of the blade, where cavitation occurs. The conduit is specifically positioned within the edge part to deliver pressurized air directly to the cavitation-prone regions. This localized approach maintains effective cavitation suppression while minimizing the overall duct system complexity by concentrating the air distribution function where it is most needed.
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 effectively suppresses cavitation and reduces noise while enhancing the structural strength of the blade, eliminating the risk of cracks and providing a more reliable and cost-effective solution compared to traditional techniques.
Implementation Method 1
building up an edge part onto the edge part receiving surface by a wire-based additive manufacturing process
Implementation Method 2
The heat source may be an electric arc, the raw material may be a welding filler wire
Implementation Method 3
By blowing air, via the supply duct, the conduit, and the holes, the cavitation collapse process is suppressed such that cavitation erosion is eliminated or at least reduced
Data Source
AI summary
The present invention involves a method for manufacturing a blade (1) for a propeller, which blade (1) has a leading edge (2) and a trailing edge, the method comprising the steps of: forming a conduit in the blade (1), making a plurality of holes (7) through which the conduit (6) communicates with the exterior of the blade (1), and providing a blade blank having an edge part receiving surface (4) extending along at least a major part of the leading edge (2) of the blade (1) to be manufactured, wherein forming a conduit (6) comprises building up an edge part (3) onto the edge part receiving surface (4) by a wire-based additive manufacturing process, wherein the additive manufacturing process is adapted to form the conduit (6) at least partly delimited by the edge part (3) and extending along the leading edge (2) of the blade (1) to be manufactured.