Renewable Energy World

Renewable Energy World

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Mini wind farms for sale in Sardegna (Italy). great investiment. Contact me at

Civil - structural engineer -Looking for new challenges

  • Comment (2)
  • February 1, 2013
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  • Shoaib A.


    Shoaib A.

    Managing Director at Natural Power Developers

    can you post some more details of the wind farm?

  • Sergiy K.


    Sergiy K.

    Inventor in Rotor Blade Design-HAWT Optimization & Rotary-wing Upgrade

    Hello everyone,
    I'm looking to develop the below.
    By use my invention it is possible to enhance the productivity of wind farms by at least 15-20 % before they will achieve a rated power thanks to newly designed blades. Each section of these blades has an additional impulse. The power coefficient Cp at this method is the closest to the Betz' limit. As known from the blade theory the more an airflow deflection behind airfoil section, the more the driving force of wind turbine in whole. Leading edge slats installed at the roots of blades of horizontal - axis wind turbines allow to reach that. The additional impulses ensure to increase a number of rounds per time unit by wind turbine within speed-in and rated wind speed. After the rated power has been achieved, the rounds will be constant like at the prototype. For example, there is a developed wind turbine with the rated output power of 100 kW at the appropriate wind speed of 13 m/s. Start up of this wind turbine is at 3 m/s. Straighten root area of blades (0-0 through X-X cross-sections), while the remainder zone is with its own relative twist angle. Install slats within named sections. What do we watch? First of all, start up of this turbine will be at lower wind speed compared to a prototype, at 2-2,5 m/s. Rated power of that wind turbine can be reached already at the wind speed of 10 m/s. This invention is working within named winds, cut-in and rated ones. That is enough I think, because not often the winds blow at which designed the prototype of wind turbine taken as an example above.
    In addition, it can be seen that at the high value of relative tip-to-root twist angles it is possible to use blade's area swept by the slats only, ignoring "pure" blade at the tip. Why for? In order to use both smaller tower and turbine compared to a prototype.
    This invention was filed on March, 1995 and published on February, 2000, bulletin 1, under #27062 and since then has priority with respect to any similar patent applications.
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