Experimental study of the effective parameters on the offshore wind turbine's airfoil in pitching case

Nowadays, wind energy plays a great role in the world's energy production. Detection and experimental measurement of the effective parameters on the transient lift and drag coefficients in the blades are very important in the wind turbine design. In this study, the aerodynamic coefficients of an oscillating wind turbine airfoil are evaluated. Due to the unsteady nature of the wind turbine's surrounding flow, blades are chosen according to the oscillating motion, which creates unsteadiness. The experiments are carried out using the constructed system in the Laboratory of Aerodynamics in the Hakim Sabzevari University. Firstly, experimental data were validated with the published experimental data. These coefficients operate as an oscillating force and result in increasing the fatigue tension. Therefore, the effective parameters in this paper, including reduced frequency, mean angle of attack, amplitude, and Reynolds number, were studied on the hysteresis loops in terms of real experimental conditions. Furthermore, in the last section of the research, the airfoil is corrected based on the entropy analyze results. Afterward, the unsteady aerodynamic coefficients corrected airfoil will be measured. The results show that a more suitable airfoil could be chosen based on the wind turbine's rotation frequency.