Function of Aerofoil Blades in Modern Wind Turbines:
Aerodynamic Principle: Modern horizontal-axis wind turbines (HAWTs) use aerodynamic lift-based blades rather than drag-based blades.
Lift vs Drag: As wind flows over an aerofoil cross-section, the curved suction side accelerates air faster than the flat pressure side, generating a strong net aerodynamic lift force perpendicular to relative wind direction.
Driving Torque: This lift force produces the rotational driving torque on the rotor shaft, maximizing power conversion efficiency toward the Betz limit ($C_p \le 59.3\%$) while minimizing structural drag loads.
Conclusion: To increase lift (Option 2).
Correct option: (2) To increase lift
Explanation not matching this question?क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?Report