Aerodynamic design & analysis of the Innovative Tip Brake of the NMITLI 500 kW Horizontal-Axis Wind Turbine

De, Manabendra M and Kanakamuthu, and Isaac, JJ (2011) Aerodynamic design & analysis of the Innovative Tip Brake of the NMITLI 500 kW Horizontal-Axis Wind Turbine. Technical Report. National Aerospace Laboratories, Bangalore, India.

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    The present report consolidates the aerodynamic sizing of an innovative tip brake. The innovativeness in the design lies in the fact that the tip brake, in the braking position, not only provides a braking surface to retard the rotor, but also spoiles the flow over the outboard portion of the wind turbine rotor lifting aerofoil blade. At the same time, in its non-braking position, when the flaps are inline with the main blade, it acts as leading edge flaps and trailing edge slats and thereby augments the power to consequently improve the performance of the rotor. The present report consolidates the aerodynamic design and analysis of the primary tip brake and spoiler flaps that has been worked out for the braking mode. The augmentation due to the presence of the flaps in the non braking mode has also been worked out. The loads during the braking (aerodynamic pressure / loads acting on the surface of the tip brake) have been quantified. The sizing was done for three configurations of the aerodynamic brake with different primary tip brake width (0.6 m, 1 m, 1.25 m and 1.5 m). Finally, after intra-divisional discussions, the final configuration with primary tip brake width of 1.5 m was chosen for further structural design.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Aerodynamic Tip Brake;Stall regulation;Horizontal axis; Leading edge slat;Trailing edge flap;Spoiler;Computational fluid dynamics;GH-bladed;Field trials;Power curve
    Subjects: AERONAUTICS > Aeronautics (General)
    AERONAUTICS > Aerodynamics
    Division/Department: CSMST, CSMST, CSMST
    Depositing User: Ms. Alphones Mary
    Date Deposited: 11 Nov 2011 12:18
    Last Modified: 11 Nov 2011 12:18

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