Blade Heat Repairs

Blade Solutions has developed repair methods for blade heat systems. These repair methods have been used extensively in both laboratory and on wind turbines. Blades subjected to both small impact related damages and larger lightning damages has been repaired, significantly reducing costs compared to not using the heating system or blade replacements.

 

Hot Spot Repairs

Conductive heat systems are energy efficient compared to the convective types since only a small part of the blades are prone to generate ice crust formation and needs heating. The heating mats are therefore primarily applied on or near the leading edge on the outer half of the blade. Unfortunately, the same area is also the one that is most subjected to ice or lightning damages.

 

Additionally, the conductive heat system itself acts as a lightning rod, increasing the likelihood of lightning strikes. Physical impacts and lightning damages of the conductive heating systems are therefore common, and these damages give rise to hot spots, increasing local temperatures beyond the matrix/epoxy degradation temperature. The hot spots may therefore induce a growth of the damages during operation.

Hot spot damage undergoing repair.
Hot spot damage undergoing repair.
Vacuum infusion repair.
Vacuum infusion repair.

Thermal inspection after repair. No hot spots detected.
Thermal inspection after repair. No hot spots detected.