BEFORE & AFTER
When leading-edge erosion becomes a performance issue
This is one of the most visible examples of why wind turbine blade maintenance cannot be treated as cosmetic work.
The “before” photo shows severe surface degradation along the blade’s leading edge. The “after” photo shows the geometry restored and the surface protected again.
But the real objective of this work is not simply to make the blade look new.
The leading edge is one of the most aerodynamically sensitive areas of a wind turbine blade.
During operation, this area is continuously exposed to rain, airborne particles, insects and other environmental impacts. Over time, erosion can progress from minor coating degradation to significant surface roughness and material loss.
Surface condition matters
A rough or damaged leading edge can disturb the intended airflow around the blade profile. As degradation progresses, it may influence aerodynamic efficiency and eventually require increasingly extensive repair.
A controlled repair process
Professional leading-edge repair follows a controlled process:
- Assess the extent of damage.
- Remove degraded material.
- Prepare a sound and correctly profiled substrate.
- Repair defects where required.
- Restore the aerodynamic contour.
- Apply the specified protective system.
- Inspect and document the completed work.
Geometry is one of the most important points
A technically sound repair is not achieved simply by adding material and applying a new coating.
The repaired area must transition smoothly into the original blade profile. Excessive material, uneven finishing or poor transitions can create their own aerodynamic disturbance.
The difference between these two photos therefore represents much more than appearance.
It represents the restoration of a functional aerodynamic surface designed to operate under demanding conditions for thousands of hours.
Blade maintenance is not about making damage disappear.
It is about restoring the blade as close as possible to the condition the engineering requires.
And that is where workmanship, process control and final inspection make the difference.