ELLE - Proven lifetime protection against leading edge erosion
ELLE - Proven lifetime protection against leading edge erosion

ELLE - Proven lifetime protection against leading edge erosion

Recent laboratory tests have confirmed again: our polyurethane softshell, ELLE™, in fact puts an end to leading edge erosion.

Methodology - from testing to lifetime estimation

 

The DNV GL-RP-0573 provides a methodology to evaluate and predict the durability of erosion protection systems. We have followed this recommended practice to forecast the durability of ELLE™.

The process involved:

 

  1. Extensive rain erosion testing of ELLE™ according to DNV GL-RP-0171
  2. Statistical analysis of data as per ASTM E739 standard practice
  3. Combining the rain erosion testing and statistical analysis with material properties such as density, speed of sound and thickness allows us to calculate the erosion strength of ELLE™
  4. Utilizing site- and turbine-specific data, such as annual rainfall, average wind speed, TSR, tip speed and blade length, we can calculate the durability of ELLE™ for any given site

 

The process to calculate LEP durability based on DNV GL-0573

ELLE™ prevents several repairs over 25 years


Example field case showing that ELLE prevents 6 repairs over 25 years. (Input parameters: turbine type: 1.5 MW, rotor diameter: 77 m, blade length: 37.3 m, nominal RPM: 18.36, annual rainfall: 1,600 mm, mean wind speed: 8.5 m/s) 

LEP durability after 8 and 25 years of operation


Example field case showing the accumulated erosion damage on a blade after 8 and 25 years of operation with and without ELLE. ELLE protects the blade from erosion throughout the turbine’s lifetime. (Input parameters: turbine type: 1.5 MW, rotor diameter: 77 m, blade length: 37.3 m, nominal RPM: 18.36, annual rainfall: 1,600 mm, mean wind speed: 8.5 m/s) 

Onshore example case - 1.5 MW turbine


Onshore example case showing the return on investment (ROI) and payback period for an ELLE installation. 

 

 

 

Proven lifetime durability for ELLE™

 

We have calculated ELLE™’s durability for various sites and turbines around the world. The results show that:

 

  1. In most cases, ELLE™ remains in the incubation period for 25 years of operation. (i.e. it will not enter the erosion period, no erosion will be visible, and no repair is needed) 
  2. For the most extreme sites with regards to tip speeds and/or rainfall, ELLE™ may show erosion damage that would require maximum one repair during the turbine’s lifetime. 
  3. Without any protection (i.e. conventional coating), the leading edges will have visible erosion damages after a few years, which will require repairs up to 6 times over 25 years. 
  4. Conventional coatings will experience severe erosion in the tip section, which will require repair. Installing ELLE™, however, will not only protect the tip of the blade, but also the rest of the leading edges from experiencing severe erosion after 25 years of operation. 

 


Should you invest in ELLE™ ?

 

All sites and turbines are different, which has a trickle-down effect on your operating expenses and levelized cost of energy. This means that we need to investigate, whether ELLE™ is the right solution for you and if it is worth your investment. 

 

That is why we have created a Value Calculator. 

 

The Value Calculator combines site-specific parameters (e.g. number of turbines, nominal output, remaining project lifetime, electricity price) with data that is based on experience and domain expertise (e.g. maintenance costs and interval, RPM, rainfall). By combining these inputs with ELLE™ installation costs, we can calculate your ROI and payback period. This allows you to make a sound decision on whether ELLE™ is the right solution for your blades. 

 

 


Web by the friendly dotpeople