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Numerical study on unsteady performance of a Wells turbine under irregular wave conditions

Author

Listed:
  • Wang, Ru
  • Cui, Ying
  • Liu, Zhen
  • Li, Boyang
  • Zhang, Yongbo

Abstract

The axial-flow Wells turbine is one of the most widely used power take-off unit for oscillating water column wave energy converter. Despite advancements, many converters still encounter challenges such as intermittent power output and difficulty in self-starting for air turbines. The reason behind this could be attributed to the fact that previous studies primarily focused on examining the unsteady performance of air turbines at a fixed rotation speed or under ideal sinusoidal airflow conditions. To predict the unsteady responses under irregular wave conditions, a transient free-running numerical model of a Wells turbine was developed in the present work. Following the validation of experimental results, the mechanism of hysteresis was further investigated by analyzing performance parameters, time-varying details of 3D flow field, and dependence factors. Furthermore, effects of significant wave height and peak spectral period on the ability to self-start were studied.

Suggested Citation

  • Wang, Ru & Cui, Ying & Liu, Zhen & Li, Boyang & Zhang, Yongbo, 2024. "Numerical study on unsteady performance of a Wells turbine under irregular wave conditions," Renewable Energy, Elsevier, vol. 225(C).
    • Handle: RePEc:eee:renene:v:225:y:2024:i:c:s0960148124003203
    DOI: 10.1016/j.renene.2024.120255
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