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http://dx.doi.org/10.1016/j.ijnaoe.2016.05.009

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)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.8, no.5, 2016 , pp. 456-465 More about this Journal
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.
Keywords
Oscillating water column (OWC); Wells turbine; Computational fluid dynamics (CFD); Blade tip treatment; Endplate-type rotor; Ring-type rotor; Steady & quasi-steady analysis;
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Times Cited By KSCI : 2  (Citation Analysis)
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