Presentation Description: Until now, the installation of aerodynamic upgrades as retrofits has been limited in scope due to the requirement to stay within the turbine’s design loads envelope. Research and field testing conducted by Power Curve has previously demonstrated that vortex generators can be positioned towards the tip of a blade to recover energy lost through blade contamination without increasing loads. Power Curve is now conducting aerodynamic research on add-ons to reduce blade loads. Blade design (especially of older turbines) is limited by industry-standard analysis tools that rely on 2D aerodynamic models that are unable to capture the complex 3D flow around a turbine. Using high-fidelity computational fluid dynamic (CFD) models, it has been found that it is possible to both increase AEP and reduce blade bending loads by careful application of lift-modifying devices along the length of the blade. Depending on the business model of the customer, a suitable balance of AEP increase and load reduction can be designed to take advantage of the prevailing economic drivers i.e. more revenue in the short term, or a longer asset life (enabled through load reduction). This presentation will describe the aerodynamic theory behind this concept and include CFD and wind tunnel test results.
Methodology: Images from CFD simulations, wind tunnel testing, and field testing. Physical demonstration parts to pass around.
Upon completion, participant will be able to describe common aerodynamic add-ons and their impact on turbine performance.
Upon completion, participant will be able to describe the limitations of two-dimensional aerodynamic modelling techniques and have a basic understanding of the benefits of using CFD methods to analyse blades.
Upon completion, participant will be able to describe how wind turbine loading distributions can be modified to reduce blade bending loads.