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<p>In this study, a horizontal-axis Darrieus turbine was designed for a wave energy converter (WEC) application, generating electricity from naturally oscillating water near the breaking wave zone. The design goal is for a two-turbine system to provide sufficient power to the generator such that the WEC achieves an average output power of &gt; 10&#xa0;kW at 120–180&#xa0;rpm. The estimated full-scale turbines have overall lengths and radii of 1580&#xa0;mm and 1100&#xa0;mm, respectively. Two 1:3 scale turbines were manufactured to evaluate their performance under seawater conditions in a high-speed circulating water tank system: one turbine with a NACA6620 hydrofoil and one turbine with a NACA4420 hydrofoil. Each small-scale turbine was designed with a set of three blades. Both turbines were tested at various flow velocities, and a stress test under a maximum speed of approximately 350&#xa0;rpm was also performed. Additionally, the effect of a cowling, which increases the streamlined shape of the turbine hub, was also evaluated. During performance evaluations, the torque and resistance voltage were measured while the rotation speed of the turbine was changed at a constant flow velocity. The turbine efficiency was subsequently calculated on the basis of these measurements in terms of the circumferential speed and coefficient of performance. For the small-scale NACA6620 hydrofoil turbine, normalized efficiencies of 20–23% and 18–20% were achieved with a cowling and without a cowling mounted on the turbine hub, respectively. These findings reveal that the NACA6620 airfoil is suitable for use as a horizontal-axis Darrieus turbine.</p>

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Conceptual turbine design for the Darrieus-type wave energy converter

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Patrick Bach,
  • Tsumoru Shintake,
  • Hideki Takebe,
  • Jun Fujita,
  • Kazuaki Uchibori,
  • Isaku Kanno

摘要

In this study, a horizontal-axis Darrieus turbine was designed for a wave energy converter (WEC) application, generating electricity from naturally oscillating water near the breaking wave zone. The design goal is for a two-turbine system to provide sufficient power to the generator such that the WEC achieves an average output power of > 10 kW at 120–180 rpm. The estimated full-scale turbines have overall lengths and radii of 1580 mm and 1100 mm, respectively. Two 1:3 scale turbines were manufactured to evaluate their performance under seawater conditions in a high-speed circulating water tank system: one turbine with a NACA6620 hydrofoil and one turbine with a NACA4420 hydrofoil. Each small-scale turbine was designed with a set of three blades. Both turbines were tested at various flow velocities, and a stress test under a maximum speed of approximately 350 rpm was also performed. Additionally, the effect of a cowling, which increases the streamlined shape of the turbine hub, was also evaluated. During performance evaluations, the torque and resistance voltage were measured while the rotation speed of the turbine was changed at a constant flow velocity. The turbine efficiency was subsequently calculated on the basis of these measurements in terms of the circumferential speed and coefficient of performance. For the small-scale NACA6620 hydrofoil turbine, normalized efficiencies of 20–23% and 18–20% were achieved with a cowling and without a cowling mounted on the turbine hub, respectively. These findings reveal that the NACA6620 airfoil is suitable for use as a horizontal-axis Darrieus turbine.