Study the effect of wind speed on the dynamic stall behavior of horizontal axis wind turbine performance characteristics during yaw misalignment using analytical approach

E. S. Abdelghany, Mohamed B. Farghaly

Abstract


The stall phenomena are essentially important in the design and operation of the several aerodynamic applications especially for rotating wings such as wind turbines. This phenomenon is considered the primary cause of the unsteady loads on blades profile and has a negatively impacts in the aerodynamic characteristics, turbine fatigue life and the accurate prediction of these loads becomes essential. This process contributes to an increase in the aerodynamic loads over the blade profile which encounter when the turbine blade sectional attack angles are rapidly exceeds the static stall attack angle because gusts, turbulence in-flow, and yaw-misalignment. This research aims to study the effect of wind speed on the behavior of dynamic stall of horizontal axis wind turbine performance characteristics in the presence of yaw-misalignment. The turbine blade profile was modelled using S809 airfoil section. The mathematical model was created and adopted using MATLAB software based on the blade element momentum theory. The dynamic stall model of Beddoes–Leishman in the existence of yaw misalignment was tailored and implemented in the created MATLAB code for wind turbine blade applications. The turbine performance characteristics with the rotor azimuthal angles and flow attack angle variation were predicted and discussed for various wind speeds at several span-wise sections along the rotor blade length. The obtained results illustrate that the phenomena of the dynamic stall occur mainly at the inboard station of rotor blade, and the hysteresis values of the normal force coefficient loops is greater than the tangential force coefficient loops.


Keywords


Wind Turbine Performance, Dynamic Stall Phenomena, Reduced Frequency, Yaw Misalignment, Leishman–Beddoes Model

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v13i2.13933.g8767

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