Abstract <p>The impact of the morphed trailing-edge flap (MTEF) on the aerodynamic performance of the micro horizontal-axis wind turbines is numerically and experimentally studied. A small-scale wind tunnel facility and 16 wind turbine rotors are employed to conduct the experimental investigations. Measurements of the wind speed, the rotational speed, and the power coefficient of the turbines are performed for various values of the tip speed ratio. The standard L₉(3⁴) orthogonal range analysis shows that the sequence of enhancement brought by the MTEF parameters to the wind turbine performance is identified as the flap angle, the flap length, and the flap extension. Various flap angles are then studied and predicted using artificial neural network (ANN).The results show that the best performance improvement is obtained for a flap angle 20°, a relative flap length 0.3, and a relative flap extension 0.3. In this case, at a wind speed 1.29 m/s, the power and the thrust increase by 105.17 and 70.82%, respectively, compared with the baseline wind turbine.</p>