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Power Output Enhancement of Straight-Bladed Vertical-Axis Wind Turbines with Surrounding Structures

Author

Listed:
  • Koichi Watanabe

    (Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan)

  • Megumi Matsumoto

    (Department of Aeronautics and Astronautics, Kyushu University, Fukuoka 819-0395, Japan)

  • Thandar Nwe

    (Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia)

  • Yuji Ohya

    (Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan)

  • Takashi Karasudani

    (Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan)

  • Takanori Uchida

    (Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan)

Abstract

Wind tunnel experiments were conducted by installing wind-acceleration structures on both sides of a straight-bladed vertical-axis wind turbine (VAWT) to improve the output performance of the turbine. In the case of Venturi-shape structures, a curved shape with a large outlet opening produced a higher power output than straight or brimmed Venturi shapes. More importantly, two simple flat plates installed upstream of the wind turbine achieved the highest power enhancement of 2.4 times the power of the bare wind turbine. From the analysis of the flow visualization results, the power enhancement was attributed to the increase in lift force on the blades in the upstream region due to the acceleration of the gap flow between the flat plates, and the decrease in drag force on the blades toward the upstream region due to stagnation of the flow behind the plates.

Suggested Citation

  • Koichi Watanabe & Megumi Matsumoto & Thandar Nwe & Yuji Ohya & Takashi Karasudani & Takanori Uchida, 2023. "Power Output Enhancement of Straight-Bladed Vertical-Axis Wind Turbines with Surrounding Structures," Energies, MDPI, vol. 16(18), pages 1-20, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:18:p:6719-:d:1243788
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    References listed on IDEAS

    as
    1. Mohamed, M.H. & Janiga, G. & Pap, E. & Thévenin, D., 2010. "Optimization of Savonius turbines using an obstacle shielding the returning blade," Renewable Energy, Elsevier, vol. 35(11), pages 2618-2626.
    2. Koichi Watanabe & Shuhei Takahashi & Yuji Ohya, 2016. "Application of a Diffuser Structure to Vertical-Axis Wind Turbines," Energies, MDPI, vol. 9(6), pages 1-14, May.
    3. Koichi Watanabe & Yuji Ohya, 2021. "A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser," Energies, MDPI, vol. 14(12), pages 1-15, June.
    Full references (including those not matched with items on IDEAS)

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