International Journal of Advanced Innovative Technology in Engineering (IJAITE)

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Study of Improved Dual Blade Wind Turbine

Piyush S. Gulghane, Rahi J. Saoji, Gaurav B. Salve, Rajeshvi A. Motghare, Rutuja N. Barai, Divesh C. Hingnekar, Prof. V. R. Doifode

Abstract :

A dual blade wind turbine having two rotors rotating in same or in opposite direction the same axis has been proposed as a new concept to enhance the maximum power coefficient of a wind turbine. It is predicted that the turbine operates in isolation, numerical analyses are carried out for two atmospheric stability conditions: (1) neutral, and (2) stable. Comparisons are made with the corresponding analyses of a comparable conventional single-blade wind turbine (SBWT) to assess changes in: (a) aerodynamic efficiency, and (b) dynamic loads on the turbines. From results we can conclude that the DBWT improves isolated turbine performance even when atmospheric boundary layer effects are considered. DBWT enhances wake mixing when background turbulence due to the atmospheric boundary layer is moderately high. This has implications on wind plant performance when multiple turbines are placed one behind the other. No significant increase in aerodynamic loads is observed in the DBWT design. In fact; the out-of-plane blade root moment of the main rotor is reduced in the DBWT. Spectral analyses show peaks in unsteady loads at the rotor blade passing frequency and its harmonics for both the primary and secondary rotors. Loads at other (combination) frequencies are observed in the secondary rotor.

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