Innovative wind power technologies have led to wind turbines with significantly longer and more flexible blade designs to meet the rise in green energy demands. Aeroelastic vibrations of large horizontal-axis wind turbines play a vital role in the aerodynamic performance of the turbine blades. Previous studies in the field of oscillating wind turbines were mostly focused on low-fidelity numerical simulations, and most of these analyses were performed over two-dimensional wind turbine blade sections. However, it is essential to perform a highly accurate numerical analysis over a mid-section of a wind turbine blade to capture all details of vorticities, flow separation, and pressure distribution on the surface of the blades by considering their flap-wise oscillations. In this study, high-order direct numerical simulation based on the spectral-hp element method is employed to capture all details of flow structure on the surface of NACA0012 wind turbine aerofoil for different angles of attack. The simulations were performed at Re=1.30×105, and the blades have harmonic oscillations at the Mach number of Ma∞=0.4. The results show that the flow separation point is significantly affected due to the vibrations. Flow separation occurs at X/C=0.580 over the stationary blade, while it happens much faster at X/C=0.172 on the surface of the oscillating airfoil. Flow detachment and reattachment due to the flap-wise oscillations is the main reason for faster separation and additional flow disturbance.
|Number of pages||8|
|Publication status||Accepted/In press - 10 Apr 2022|
|Event||The International symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of turbomachines (ISUAAAT) - Universidad Castilla La Mancha, Toledo, Spain|
Duration: 19 Sep 2022 → 23 Sep 2022
|Conference||The International symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of turbomachines (ISUAAAT)|
|Period||19/09/22 → 23/09/22|