Composite Propeller Blade Root Positioning via 3D Weave Housing
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Solution Overview
Problem
Propeller blades for turboprop engines face challenges in maintaining the root portion's position relative to the airfoil fiber structure, especially under mechanical stresses or impacts, due to their composite material composition.
Innovation Solution
A propeller blade design featuring a fiber reinforcement with a three-dimensional weaving pattern that integrates a root portion and an airfoil portion, including non-interlinking areas that form a housing for a conformation part, ensuring the root's secure attachment and enhanced mechanical strength through continuous woven reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If propeller blades are made of composite material to reduce mass, then weight is reduced, but mechanical strength and stability of the root portion relative to the airfoil deteriorate
Solution Approach 1:
The patent employs a composite structure combining fiber reinforcement (glass, carbon, or aramid fibers) with a polymer matrix (epoxy, polyester, or vinyl ester resin). This composite material provides both weight reduction and mechanical strength. The fiber orientation and stacking sequence are optimized to withstand specific loads while maintaining low weight, directly resolving the contradiction between lightweight design and mechanical strength requirements.
Solution Approach 2:
The patent implements different fiber reinforcement configurations in different regions of the blade. The root portion uses a specific fiber orientation and density to maximize attachment strength, while the airfoil portion uses optimized fiber layouts for aerodynamic performance. This localized optimization ensures that each region has the appropriate mechanical properties for its function, maintaining overall structural integrity while minimizing weight.
2Strength
If a spar is added into the fiber structure to enhance mechanical strength, then strength is improved, but the complexity of maintaining the spar in position deteriorates
Solution Approach 1:
The patent integrates the spar function directly into the molded fiber reinforcement structure itself, eliminating the need for a separate inserted spar. The root portion is formed as an integral part of the blade during the molding process, with the fiber layers and matrix working together as a unified load-bearing structure. This merging simplifies the overall design by removing the complexity of inserting, positioning, and securing a separate spar component.
Solution Approach 2:
The patent divides the blade into distinct functional regions (root portion, transition zone, airfoil portion) with specific fiber reinforcement patterns in each. The root portion uses a dense, multi-directional fiber weave optimized for attachment strength, while other regions use lighter reinforcement. This segmentation allows each region to be optimized independently for its specific mechanical requirements without compromising the overall structure.
Data Source
AI summary
A vane includes a fiber reinforcement having a three-dimensional weaving densified by a matrix, the fiber reinforcement including in a single woven part a root portion and an airfoil portion extending along a longitudinal direction between the root portion and a vane tip portion and along a transverse direction between a leading edge portion and a trailing edge portion. The airfoil portion includes first and second extrados and intrados faces. The fiber reinforcement includes a non-interlinking forming a housing inside the fiber reinforcement, a conformation part being present in the housing. The non-interlinking extends over a non-interlinked area inside the airfoil portion of the fiber reinforcement included between the root portion and the vane tip portion in the longitudinal direction and between the leading edge portion and the trailing edge portion in the transverse direction, the non-interlinking also opening outside the airfoil portion of the fiber reinforcement.