Flexible Rotor Blade Tip Extension for Duct Clearance Control
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Solution Overview
Problem
Ducted rotor systems face challenges in maintaining a constant tight clearance distance between rotor blades and the rotor duct due to manufacturing and operational tolerances, which affects their efficiency and performance.
Innovation Solution
The implementation of rotor blade tip extensions made from flexible materials with flexible elements that match the shape of the rotor blades, providing a fixed extended length and minimizing clearance distance while accommodating unintended contacts with the rotor duct.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rigid tip extensions are used to maintain fixed blade length, then manufacturing precision can be improved, but the system becomes vulnerable to damage during unintended contacts with the rotor duct
Solution Approach 1:
The tip extension incorporates flexible elements (bristles, wires, or chains) that can bend and deform during unintended contact with the rotor duct, preventing rigid impact damage while maintaining the fixed extended length for optimal clearance distance
Solution Approach 2:
The tip extension combines rigid structural components (for maintaining shape and length) with flexible elements (for impact absorption), creating a composite structure that simultaneously achieves manufacturing precision and contact damage resistance
2Object-affected harmful factors
If flexible materials are used for tip extensions to accommodate contact, then damage during contact is reduced, but manufacturing precision and clearance distance control deteriorate
Solution Approach 1:
The tip extension has different properties in different regions: the core structure maintains rigid geometric accuracy for clearance control, while the outer flexible elements provide contact protection, with each zone optimized for its specific function
3Reliability
If integrated rotor blade design is used to optimize performance, then ducted effectiveness is improved, but ease of repair deteriorates due to difficulty in replacing worn tips
Solution Approach 1:
The tip extension is designed as a separate, detachable component that can be independently replaced when worn, while remaining integrated with the rotor blade during operation to maintain optimal aerodynamic performance and clearance characteristics
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 solution enhances the ducted effectiveness of rotor systems by maintaining a minimized clearance distance, reducing damage during unintended contacts, and allowing for easier replacement of worn tip extensions, thereby improving manufacturing efficiency and reducing operational costs.
Implementation Method 1
The flexible elements may increase flexibility of the tip extension to provide relief in a direction of motion of the rotor blade during unintended contact with the rotor duct
Data Source
AI summary
A rotor system is provided in one example embodiment and may include a rotor duct; at least one rotor blade, wherein the at least one rotor blade comprises a tip end; and a tip extension affixed at the tip end of the at least one rotor blade, wherein the tip extension comprises a plurality of flexible elements and the rotor blade has a fixed extended length based on the tip extension. The tip extension may provide a clearance distance between the tip extension and the rotor duct.