Segmented Blade De-icer for Manufacturing and Repair
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Solution Overview
Problem
Existing blade de-icing systems, particularly those with electrical heaters, face challenges such as complex 3D geometry production, high scrap rates, geometrical discrepancies during bonding, high costs, and the need for full heater replacement due to defects, as well as material aging.
Innovation Solution
A blade de-icing system comprising two separate heater parts bonded to the external surfaces of the blade's face and camber sides, with each part independently energizable and controllable, using fibre-reinforced composite or elastomeric materials with reinforcing backing, and an anti-erosion layer to protect the heaters from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-piece electrical heater with metallic foil embedded in elastomeric matrix is used, then the heater can provide continuous heating coverage, but the 3D geometry is difficult to produce leading to high scrappage rates
Solution Approach 1:
The heater is divided into two separate parts: a first heater part for the camber side and a second heater part for the face side of the blade leading edge. Each part can be manufactured independently as a flat component, avoiding the difficulty of producing complex 3D geometries as a single piece, while together they provide continuous heating coverage across the entire leading edge.
2Reliability
If a one-piece heater is used, then continuous heating is achieved, but geometrical discrepancies occur during bonding due to softness of the material
Solution Approach 1:
By segmenting the heater into two separate flat parts, each part has a simpler geometry that is easier to bond accurately to the blade leading edge. The flat configuration reduces material deformation and geometrical discrepancies during the bonding process compared to a single complex 3D piece.
Solution Approach 2:
The two separate heater parts are positioned and bonded to adjacent surfaces of the leading edge (camber side and face side), effectively merging their heating functions to provide continuous thermal coverage across the entire leading edge, eliminating gaps while maintaining bonding precision.
3Reliability
If a one-piece heater is used, then complete heating coverage is provided, but the whole heater must be removed and replaced when there is a defect on just one side
Solution Approach 1:
The heater is segmented into two independently replaceable parts. If a defect occurs on one side of the blade, only the corresponding heater part (first or second part) needs to be removed and replaced, rather than replacing the entire heater assembly. This reduces repair time, material waste, and operational downtime.
4Ease of operation
If a one-piece heater with elastomeric matrix is used, then flexible bonding is achieved, but the matrix material ages necessitating replacement
Solution Approach 1:
The elastomeric matrix material is extracted and replaced with a fibre-reinforced composite material for the heater parts themselves. This new material provides both the necessary flexibility for bonding and significantly improved durability and resistance to aging, extending the service life of the heater components while maintaining bonding capabilities.
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 scrap rates, facilitates easier and more accurate bonding, allows for independent repair and replacement of damaged parts, and optimizes energy use by enabling tailored heating regimes, thus lowering costs and improving reliability.
Implementation Method 1
an electric heating element (34) extending from a base end (30) to a tip end (32) of the heater part (26, 28)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A blade (2) comprises a blade body (4) and blade de-icer (20) located on the leading edge (10) of the blade body (4). The blade de-icer (20) comprises a first heater part (26) bonded to an external surface of a face side (6) of the blade body (4) and a separate second heater part (28) bonded to an external surface of a camber side (8) of the blade body (4). The first and second heater parts (26, 28) each extend to the leading edge (10) of the blade body (4). Each heater part (26, 28) comprises an electrical heating element (34) arranged therein sandwiched between an inner layer (36) and an outer layer (38) of the heater part (26, 28).