Direct numerical simulations of aerodynamic performance of wind turbine aerofoil by considering the blades active vibrations

In the present study, aerodynamic performance of horizontal-axis wind turbine blades by considering flap-wise oscillations are numerically investigated using direct numerical simulations (DNS). The details flow structure can be analysed and predicted performing DNS over an oscillating blade realistic behaviour with natural vibration frequencies. this impact vibrations on separation point, laminar bubble (LSB) stall NACA-4412 aerofoil utilising high-fidelity spectral-hp element methodology. Reynolds number angle attack were selected in range 50,000?Re?75,000 8°?AoA?16°. It is found that have a noticeable delay occurrence, lift remains high even at higher AoAs, comparison stationary blade. size reduced oscillation also affects point. Due to harmonic blade, pressure signals periodic, fluctuations amplified oscillations, especially region. time-averaged coefficient increased 255.3% raising attack, from 0° 12° Re = 75,000. Compared 50,000, peak-to-peak amplitude for higher, whereas 8° slightly lower