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Experimental study on the energy harvesting performance of semi-active oscillating hydrofoils

Author

Listed:
  • He, Guanghua
  • Bu, Lingwei
  • Yang, Hao
  • Yang, Changhao
  • Ghassemi, Hassan

Abstract

This study designed a semi-active oscillating hydrofoil tidal energy harvesting device, and conducted systematic hydrodynamic experiments to investigate the impact of reduced frequency (f∗), pitch angle (θ0), aspect ratio (AR), damping coefficient (Cf​) on energy conversion efficiency. Lift, pitching moment, and heave kinematics were measured to compute power coefficients and overall efficiency. A sectional correction was applied to account for vertical flow non-uniformity in the test section. Within the explored ranges, an efficiency peak was observed near f∗ ≈ 0.12–0.14 and θ0 ≈ 70°; after correction, higher AR (e.g., AR = 8) tended to be associated with larger efficiencies, and an intermediate damping level (Cf ≈ 1.15) coincided with comparatively higher values. This study provides experimental evidence and theoretical guidance for optimizing the design of oscillating hydrofoil tidal energy systems.

Suggested Citation

  • He, Guanghua & Bu, Lingwei & Yang, Hao & Yang, Changhao & Ghassemi, Hassan, 2026. "Experimental study on the energy harvesting performance of semi-active oscillating hydrofoils," Energy, Elsevier, vol. 346(C).
    • Handle: RePEc:eee:energy:v:346:y:2026:i:c:s0360544226003166
    DOI: 10.1016/j.energy.2026.140214
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