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A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser

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  • Koichi Watanabe

    (Kyushu University Platform of Inter/Transdisciplinary Energy Research, Kyushu University, Fukuoka 816-8580, Japan)

  • Yuji Ohya

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

Abstract

We developed a new wind turbine system that consists of a diffuser shroud with a broad-ring brim at the exit periphery and a wind turbine inside it. The shrouded wind turbine with a brimmed diffuser, which we called a “wind lens turbine” (WLT), has demonstrated power augmentation by a factor of about 2–5 compared with a bare wind turbine for a given turbine diameter and wind speed. The increase in power output depends on the diffuser shape and length and the brim height. However, a simple theory presented in this paper argues that only two performance coefficients are needed to predict the performance of WLT. The coefficients are the back pressure coefficient of the brim and the pressure recovery coefficient of the diffuser. We theoretically showed that the back pressure coefficient was particularly important for the performance of WLT. Finally, the simple theory was evaluated with experimental results. The results showed good agreement with each other.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:12:p:3661-:d:578124
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    References listed on IDEAS

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    1. Koichi Watanabe & Yuji Ohya & Takanori Uchida, 2019. "Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct," Energies, MDPI, vol. 12(16), pages 1-17, August.
    2. Khamlaj, Tariq Abdulsalam & Rumpfkeil, Markus Peer, 2018. "Analysis and optimization of ducted wind turbines," Energy, Elsevier, vol. 162(C), pages 1234-1252.
    3. Robert Freda & Bradford Knight & Siddharth Pannir, 2020. "A Theory for Power Extraction from Passive Accelerators and Confined Flows," Energies, MDPI, vol. 13(18), pages 1-32, September.
    4. Shuhei Takahashi & Yuya Hata & Yuji Ohya & Takashi Karasudani & Takanori Uchida, 2012. "Behavior of the Blade Tip Vortices of a Wind Turbine Equipped with a Brimmed-Diffuser Shroud," Energies, MDPI, vol. 5(12), pages 1-14, December.
    5. Yuji Ohya & Takashi Karasudani, 2010. "A Shrouded Wind Turbine Generating High Output Power with Wind-lens Technology," Energies, MDPI, vol. 3(4), pages 1-16, March.
    6. Nunes, Matheus M. & Brasil Junior, Antonio C.P. & Oliveira, Taygoara F., 2020. "Systematic review of diffuser-augmented horizontal-axis turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).
    7. Bontempo, R. & Manna, M., 2020. "Diffuser augmented wind turbines: Review and assessment of theoretical models," Applied Energy, Elsevier, vol. 280(C).
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    Cited by:

    1. 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.
    2. Micol Pucci & Stefania Zanforlin, 2024. "The Ability of Convergent–Divergent Diffusers for Wind Turbines to Exploit Yawed Flows on Moderate-to-High-Slope Hills," Energies, MDPI, vol. 17(5), pages 1-18, February.

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