Computational analysis of performance and flow investigation on wells turbine for wave energy conversion

Accurate numerical simulation of a high solidity Wells turbine

“…In consideration of the low sea wave frequencies, previous works have carried out the fluid dynamic analysis of such a turbine by means of a quasi-steady approach. In particular, threedimensional numerical simulations were carried out by Thakker et al [20] in order to provide the performance of a Wells turbine with CA9 blade profile, by Kim et al [21] in order to study the effect of the blade sweep on the performance of a Wells turbine using either NACA0020 or CA9 blade profiles, and by Dhanasekaran and Govardhan [22] in order to investigate the characteristics of a Wells turbine with NACA0021 constant chord blades. Recently, hysteretic phenomena have been detected under oscillating flow conditions [23][24][25], especially when the oscillating flow amplitude grows.…”

“…The use of a properly designed very fine mesh allowed to adequately resolve the main flow features, including the tip leakage flow. In fact, only recently the tip clearance has been included in threedimensional numerical simulations in OWC plants, using either Wells turbines [22] or impulse turbines [26], due to the geometry complexity and the high space resolution. These works recognize that tip clearance must be taken into account to get an accurate prediction of the turbine performance, tip leakage flow being one of the most important secondary flow in turbomachinery rotors.…”

Analysis of Wave Power Plant on the Northeast Coast of the Absheron Peninsula

“…Expenditure coefficient and suitable curves to this coefficient are defined by the next equation [15,16]:…”

Performance analysis of wells turbine blades using the entropy generation minimization method

“…In general, the overall turbine performance for the NACA0020 is better than such of the CA9, Also, Takao et al [16], presents experimentally the suitable choice the sweep ratio of 0.35 for the cases of CA9 and HSIM 15-262123-1576. In another study [17], the characteristics of a Wells turbine with NACA0021 constant chord blades are investigated. They find from the numerical results that the wakes behind the turbine blades merge rigorously in the portion of radius ratio from 0.45 to 1.0, which leads the turbine to stall.…”