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Diffuser Total Efficiency Using Generalized Actuator Disc Model and Its Maximization Method

Author

Listed:
  • Shigeo Yoshida

    (Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan)

  • Masataka Motoyama

    (Graduate School of Informatics, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan)

  • Peter Jamieson

    (Wind Energy Systems CDT, Department of Electric and Electrical Engineering, Royal College Building, University of Strathclyde, 204, George Street, Glasgow G1 1XW, UK)

  • Koij Matsuoka

    (Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan)

Abstract

The diffuser total efficiency was formulated and defined based on the generalized actuator disc model for the index of the efficiency of the diffuser-alone of the diffuser-augmented wind turbines. An optimization method to maximize the diffuser total efficiency was developed using a genetic algorithm and axisymmetric computational fluid dynamics. A case study was conducted for a 10% chord-to-diameter ratio, 2% thickness-to-chord plate, and the crest position at 50% chord of the diffuser. The optimal result showed a diffuser total efficiency of 1.087. Furthermore, 1392 (=48 population × 29 generations) simulation cases of the optimization process showed that high diffuser total efficiency appears at a low-drag coefficient, high-lift coefficient, and 15–25% low diffuser height-to-chord ratio.

Suggested Citation

  • Shigeo Yoshida & Masataka Motoyama & Peter Jamieson & Koij Matsuoka, 2021. "Diffuser Total Efficiency Using Generalized Actuator Disc Model and Its Maximization Method," Energies, MDPI, vol. 14(4), pages 1-16, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:813-:d:492946
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    References listed on IDEAS

    as
    1. Liu, Yingyi & Yoshida, Shigeo, 2015. "An extension of the Generalized Actuator Disc Theory for aerodynamic analysis of the diffuser-augmented wind turbines," Energy, Elsevier, vol. 93(P2), pages 1852-1859.
    2. 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.
    3. 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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