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Performance analysis of a linear generator-based oscillating hydrofoil direct-drive system

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  • Ma, Penglei
  • Zhang, Lei
  • Qiao, Bowen
  • Qiu, Yuanchao
  • Wang, Zhi
  • Zhang, Lina

Abstract

Oscillating hydrofoils offer distinct advantages for tidal energy harvesting in shallow waters due to their spanwise scalability. However, driving a traditional rotary generator requires intermediate mechanisms to convert oscillatory motion into rotation, introducing structural complexity and compromising system efficiency. This study proposes a novel direct-drive tidal energy system for oscillating hydrofoils utilizing a linear generator. Comprehensive experiments are conducted to evaluate the effects of kinematic parameters and external loads on hydrodynamic performance and power output. Results demonstrate that oscillation frequency and load resistance significantly dictate system behavior. Under higher load resistances, reduced electromagnetic damping enables greater heaving velocities and enhanced hydrodynamic efficiency. Concurrently, decreased copper losses improve the linear generator's electromechanical efficiency. At an optimal external resistance of 80 Ω, the linear generator achieves 61.05% efficiency, yielding a reported system efficiency of 22.94% and an output power of 13.62 W.

Suggested Citation

  • Ma, Penglei & Zhang, Lei & Qiao, Bowen & Qiu, Yuanchao & Wang, Zhi & Zhang, Lina, 2026. "Performance analysis of a linear generator-based oscillating hydrofoil direct-drive system," Renewable Energy, Elsevier, vol. 269(C).
    • Handle: RePEc:eee:renene:v:269:y:2026:i:c:s0960148126006944
    DOI: 10.1016/j.renene.2026.125868
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