International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Numerical study on Wells turbine with penetrating blade tip treatments for wave energy conversion

  • Cui, Ying (Division of Naval Architecture and Ocean Systems Engineering, Korea Maritime and Ocean University) ;
  • Hyun, Beom-Soo (Division of Naval Architecture and Ocean Systems Engineering, Korea Maritime and Ocean University)
  • Received : 2015.11.23
  • Accepted : 2016.05.30
  • Published : 2016.09.30
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Abstract

In order to optimize the performance of a Wells turbine with fixed guide vanes, the designs of an end plate and a ring on the tip of the turbine rotor are proposed as penetrating blade tip treatments. In this study, numerical investigations are made using computational fluid dynamics (CFD)-based ANSYS Fluent software, and validated by corresponding experimental data. The flow fields are analyzed and non-dimensional coefficients $C_A$, $C_T$ and ${\eta}$ are calculated under steady-state conditions. Numerical results show that the stalling phenomenon on a ring-type Wells turbine occurs at a flow coefficient of ${\phi}=0.36$, and its peak efficiency can reach 0.54, which is 16% higher than that of an unmodified turbine and 9% higher than in the case of an endplate-type turbine. In addition, quasi-steady analysis is used to calculate the mean efficiency and output work of a wave cycle under sinusoidal flow conditions. As a result, it has been found that the ring-type turbine is superior to other types of Wells turbines.

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References

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