Q.1
Choose the correct characteristics of the Darrieus rotor.
(A) . low starting torque
(B) . self-starting
(C) . high speed
(D) . potentially high capital cost
(©). high efficiency
Choose the correct answer from the options given below:
- Aerodynamic Characteristics of Darrieus Wind Rotor:
- The Darrieus rotor is a vertical-axis wind turbine (VAWT) featuring curved aerofoil blades resembling an eggbeater:
- Low starting torque: Cannot self-start because at low tip-speed ratios, blade angles of attack stall relative to incoming wind.
- Self-starting: False (requires an auxiliary Savonius rotor or motor to start).
- High operating speed: Operates at high tip-speed ratios ($TSR \gt 4$).
- High aerodynamic efficiency: Can attain power coefficients ($C_p$) exceeding 0.35–0.40, approaching horizontal-axis turbines.
- Conclusion: Correct characteristics are (A), (C) and (E) only (Option 3).
Correct option: (3) (A), (C) and (E) only,
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