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  1. Siemens low noise wind power turbine blades inspired by silent flight of the owl

    Silent operation of turbines is crucial for the success of many onshore wind power projects. Siemens has therefore conducted extensive R&D over the last years to further reduce the noise of its wind turbines. An important breakthrough has now been achieved with the launch of a new generation of Siemens’ so-called DinoTail, an aerodynamic blade add-on. The trailing edge fringe of an owl’s wing provided the inspiration for this noise-reducing component. Owls are silent hunters. Flying without noise allows them to stealthily approach their prey – primarily smaller rodents. This is enabled by a particular structure of the owl’s wings: A serrated, fringed structure at the trailing edge, and small combs at the leading edge of the wings are believed to mitigate the noise of the air flow by generating fine vortices. This effect is now used by a new Siemens invention which optimizes the aeroacoustic performance of rotor blades. In addition to vortex generators on the blade surface, Siemens now equips trailing edges with a combination of serrations and combs. This combed teeth concept creates fine vortices at the point where the fast air stream from above the blade profile meets the slower flow from below. As a result, the aerodynamic noise from the trailing edge of the blade is reduced significantly. “In our wind tunnel measurements and field tests, the combed teeth showed a substantial reduction in wind turbine noise at all wind speeds,” reports Stefan Oerlemans, Key Expert, Aeroacoustics, at the technology department of Siemens Wind Power. “This structure that was inspired by owl wings does not compromise the aerodynamic performance.” As a consequence the noise mitigation does not affect the annual energy production of a wind turbine, Oerlemans explained at a presentation of the concept during the WindEnergy Hamburg 2016 trade show. For noise-constrained sites, the new technology can be used to increase energy production without increasing noise emissions. The new combed teeth blade add-on will largely replace Siemens’ first generation DinoTail for onshore wind turbines. Serial manufacturing will start soon as part of the Low Noise equipment of the new Siemens wind turbine SWT-3.3-130LN. The new DinoTail Next Generation will also be applied at further new turbine models.

    Online Articles

    Online Articles

    Wed, 28 Sep 2016

  2. PSO Continues Wind Growth with RFP for New Sites

    The RFP requires a minimum of 80 MW per site.

    Online Articles

    Online Articles

    Fri, 30 Sep 2016

  3. GE and Mainstream to develop Vietnamese wind power

    GE Energy Financial Services and Mainstream Renewable Power have signed an agreement to develop, build and operate large scale wind power plants in Vietnam.

    Online Articles

    Online Articles

    Wed, 28 Sep 2016

  4. Wolverine to add largest solar power array in northern Michigan

    Wolverine announced that one of its member-owners, Spartan will commence construction this fall on a 1.2 megawatt solar power array in Cadillac, across from Wolverine's headquarters facility.

    Online Articles

    Online Articles

    Wed, 28 Sep 2016

  1. Wind Energy News: Groundbreaking held for $80m southern Vermont wind project

    Online Articles

    Online Articles

    Tue, 20 Sep 2016

  2. Norvento chosen for small, crowdfunded wind power scheme

    The Small Wind Co-op has purchased two of Norvento’s nED100 100kW wind power turbines, which are now set to be installed at Kellybank farm in Inverclyde, Scotland.

    Online Articles

    Online Articles

    Thu, 22 Sep 2016

  3. Siemens Announces Low-Noise Wind Turbine Blades Inspired by Owl Wings

    Silent operation of onshore wind projects is important for facilities located near populations that might be disturbed by noisier turbine blades. 

    Online Articles

    Online Articles

    Tue, 27 Sep 2016

  4. Tenaska Acquires 470-megawatt Wind Development Portfolio

    The projects include 270 MW in Minnesota and 200 MW in North Dakota.

    Online Articles

    Online Articles

    Tue, 27 Sep 2016

  5. Xcel Energy to increase wind energy by more than 60 percent

    The additional wind energy is part of the company’s long-term plan to more than double its renewable energy portfolio and deliver 63 percent of our energy from carbon-free resources in the next 15 years

    Online Articles

    Online Articles

    Fri, 23 Sep 2016

  6. Duke Energy Renewables completes Los Vientos wind project in Texas

    Duke Energy Renewables has installed more than 1,500 MW of wind energy in Texas, more than double its owned wind capacity in other states combined 

    Online Articles

    Online Articles

    Wed, 3 Aug 2016

  7. Siemens to supply wind turbines for 147 MW Oklahoma wind project

    The latest order from Apex Clean Energy follows up on the completion of two previous wind turbine projects in Oklahoma 

    Online Articles

    Online Articles

    Tue, 30 Aug 2016

  8. Ocean Bureau Fields Lease Request for 765-MW Wind Project off of California

    Bureau looking for any other offers of interest for this lease area.

    Online Articles

    Online Articles

    Wed, 17 Aug 2016

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