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Force Measurements on a VAWT Blade in Parked Conditions

Author

Listed:
  • Anders Goude

    (Division of Electricity, Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden)

  • Morgan Rossander

    (Division of Electricity, Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden)

Abstract

The forces on a turbine at extreme wind conditions when the turbine is parked is one of the most important design cases for the survivability of a turbine. In this work, the forces on a blade and its support arms have been measured on a 12 kW straight-bladed vertical axis wind turbine at an open site. Two cases are tested: one during electrical braking of the turbine, which allows it to rotate slowly, and one with the turbine mechanically fixed with the leading edge of the blade facing the main wind direction. The force variations with respect to wind direction are investigated, and it is seen that significant variations in forces depend on the wind direction. The measurements show that for the fixed case, when subjected to the same wind speed, the forces are lower when the blade faces the wind direction. The results also show that due to the lower forces at this particular wind direction, the average forces for the fixed blade are notably lower. Hence, it is possible to reduce the forces on a turbine blade, simply by taking the dominating wind direction into account when the turbine is parked. The measurements also show that a positive torque is generated from the blade for most wind directions, which causes the turbine to rotate in the electrically-braked case. These rotations will cause increased fatigue loads on the turbine blade.

Suggested Citation

  • Anders Goude & Morgan Rossander, 2017. "Force Measurements on a VAWT Blade in Parked Conditions," Energies, MDPI, vol. 10(12), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:12:p:1954-:d:120279
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    References listed on IDEAS

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    1. Eriksson, Sandra & Bernhoff, Hans & Leijon, Mats, 2008. "Evaluation of different turbine concepts for wind power," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(5), pages 1419-1434, June.
    2. Eriksson, Sandra & Solum, Andreas & Leijon, Mats & Bernhoff, Hans, 2008. "Simulations and experiments on a 12kW direct driven PM synchronous generator for wind power," Renewable Energy, Elsevier, vol. 33(4), pages 674-681.
    3. Eduard Dyachuk & Morgan Rossander & Anders Goude & Hans Bernhoff, 2015. "Measurements of the Aerodynamic Normal Forces on a 12-kW Straight-Bladed Vertical Axis Wind Turbine," Energies, MDPI, vol. 8(8), pages 1-15, August.
    4. Tjiu, Willy & Marnoto, Tjukup & Mat, Sohif & Ruslan, Mohd Hafidz & Sopian, Kamaruzzaman, 2015. "Darrieus vertical axis wind turbine for power generation I: Assessment of Darrieus VAWT configurations," Renewable Energy, Elsevier, vol. 75(C), pages 50-67.
    5. Morgan Rossander & Eduard Dyachuk & Senad Apelfröjd & Kristian Trolin & Anders Goude & Hans Bernhoff & Sandra Eriksson, 2015. "Evaluation of a Blade Force Measurement System for a Vertical Axis Wind Turbine Using Load Cells," Energies, MDPI, vol. 8(6), pages 1-24, June.
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    7. Tjiu, Willy & Marnoto, Tjukup & Mat, Sohif & Ruslan, Mohd Hafidz & Sopian, Kamaruzzaman, 2015. "Darrieus vertical axis wind turbine for power generation II: Challenges in HAWT and the opportunity of multi-megawatt Darrieus VAWT development," Renewable Energy, Elsevier, vol. 75(C), pages 560-571.
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    Cited by:

    1. Victor Mendoza & Anders Goude, 2020. "Validation of Actuator Line and Vortex Models Using Normal Forces Measurements of a Straight-Bladed Vertical Axis Wind Turbine," Energies, MDPI, vol. 13(3), pages 1-16, January.
    2. Nguyen, Van-Dang & Jansson, Johan & Goude, Anders & Hoffman, Johan, 2019. "Direct Finite Element Simulation of the turbulent flow past a vertical axis wind turbine," Renewable Energy, Elsevier, vol. 135(C), pages 238-247.

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