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Dynamic inflow: yawed conditions and partial span pitch control

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Wind turbine designers require reliable tools to assist in the development of efficient, safe, reliable wind turbines. The engineering model developed under this project provides a useful tool for the determination of time varying (fatigue) loads under specified wind conditions. The previous JOULE project, "Dynamic Inflow" (JOUR-0083) carried out by the same group of partners, derived models to describe dynamic inflow in wind turbine rotors, i.e., the instationarities and non-uniformities of the inflow velocities in the rotorplane. This project is a natural follow-on from this work and its aim is to validate engineering methods for dynamic inflow as applied to yawed misalignment conditions and partial span pitch transients. It is aimed at extending the previous work in three ways. Firstly it aims to further validate the existing models on machines of intermediate size, secondly, further develop and validate pitching transient; and finally, develop a dynamic inflow model for partial span pitch situations. These models were designed to replace the standard blade element momentum modelling currently used in the aero-elastic codes for the determination of instationary profile aerodynamics modules. The final expected result was, therefore, a validated second generation of aerodynamic models to be used in the aerodynamic design codes used by turbine designers and analysts. As all instationary phenomena will then be included, the wind turbine designer will be equipped with a more reliable tool for the determination of time varying loads under specified wind conditions.

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