Numerical Modelling and Entropy Analysis of Pitching Aerofoil Under the Dynamic Stall

In this research, the improvement of wind turbine blade undergoing pitching motion by means of identifying optimized aerofoil profile has been studied as a crucial part of enhancing effectiveness of wind energy turbine system. Here, the projected air is considered as unidirectional with flow speed range of Re 5*10(5) to 10(6). The effect of different pitching aerofoil blade profiles ranging from NACA 0012, S-809, and SD 7062 has been investigated in addition to the aerodynamic characteristics, entropy generation in the flow and exergy which are also proposed as a criterion for selecting optimum design for the oscillating aerofoil blade. Finally, increment in Re shows increase in the entropy generation rate and decrease in exergy efficiency. Consequently, aerofoil profile shows prominent variations in exergy with SD 7062 experiencing least entropy generation rate and exergy efficiency of around 93% due to its streamlined profile as compared to other profiles in this study. Meanwhile, NACA 0012 experiences minimum exergy efficiency of around 39% for Re 10(6).