Aerodynamics & Loads

The Starting Point

Based on years of experience, we instantaneously generate aerodynamic blade designs that fit to the customers project and to our idea of excellent rotor blades. We have a carefully selected set of airfoils to our disposal and rely on in-house developed flat-back airfoils in the root region and thin airfoils for the outboard part of the blade. These airfoils are extensively tested in large wind tunnels at high Reynolds numbers and under the influence of roughness and erosion protection. Sophisticated design algorithms help us ensure aerodynamic integrity also in real world turbulent conditions.

Wind tunnel test
Wind tunnel test
Blade sections
Blade sections


Design Philosophy

Power curve measurement
Power curve measurement

We believe in an advanced rock-solid aerodynamic design which guarantees power production in harsh conditions without the need for add-ons while supporting structural demands for lightweight construction. To meet the challenges of present projects we carefully develop proven concepts further, maintaining the level of confidence gained in field experience. We push the limits to achieve high yields at low loads.

Shaping the Blade

Once the project is set up in terms of an initial blade design, our integrated in-house tools enable fast iterations between aerodynamic design, load calculations and structural design. Case studies are carried out to assess the blade in design and off-design conditions, such as soiled conditions. Noise prediction models and controller settings are tuned before the blade design is finally transferred into a smooth and dent-free but aerodynamically accurate geometry. This master surface is then the interface between the design and the master plug and mould production.

Load Simulations

Balanced Design

Loads simulation is one of the most important steps in the design of a wind turbine, since the design loads influence the construction and material consumption of all the major components. Higher loads lead to higher material consumption thus a more expensive turbine. Carefully balancing turbine and blade loads against energy yield is a key challenge to make wind energy affordable.

Fast Iterations

The results from the loads simulations are fed back to the aerodynamic and structural design in order to achieve the blade and turbine configuration with the lowest cost of energy. A powerful and streamlined tool chain of in-house and industrial solutions enables rapid design loops to achieve optimized and customer specific solutions.

Case studies allow the customer to quickly identify the most promising turbine configuration based on the customer’s boundary conditions such as:

Control

State of the art control design offers maximum energy output while limiting the ultimate and fatigue loads to a reasonable level.

We actively develop new control algorithms for the next generation of wind turbines to make wind energy even more competitive.

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