Abstract:Wells turbine is the simplest type of an axial flow self-rectifying air turbine that can be used in conjunction with Oscillating Water Column (OWC) system in the extraction of ocean wave energy. It has been noticed that this turbine is subjected to early stall. As a consequence, several attempts for improving the energy extraction performance of Wells turbine within the stall regime have been investigated. One of these attempts was using an inclined slot as a passive flow control to obtain a delayed stall. In … Show more
“…counter-clockwise in Wells turbines and clockwise in oscillating airfoils (this statement is actually incorrect [18]). The presence of dynamic effects in Wells turbine was the focus of the recent numerical investigations by [19][20][21][22][23][24], who gave essentially very similar explanations. In this short note, it will be demonstrated how these results are in contradiction with well established literature on rapidly moving airfoils and wings, and are likely to be caused by errors in the analysis of the experiments and in the setup of the numerical simulations.…”
Section: Introduction Wells Turbines and Owc Systemsmentioning
confidence: 88%
“…In light of the discrepancies outlined in Section II, the authors of this note have considered important to verify the numerical results presented in older studies, noticing how none of them [11][12][13][14][15][16][17][19][20][21][22][23][24] presented an accurate analysis of the numerical errors due to temporal discretization. This appeared curious to say the least, given the importance of excluding any phase errors [41][42][43] in a study that deals with hysteresis.…”
Section: Revisiting the Cause Of The Hysteresismentioning
“…counter-clockwise in Wells turbines and clockwise in oscillating airfoils (this statement is actually incorrect [18]). The presence of dynamic effects in Wells turbine was the focus of the recent numerical investigations by [19][20][21][22][23][24], who gave essentially very similar explanations. In this short note, it will be demonstrated how these results are in contradiction with well established literature on rapidly moving airfoils and wings, and are likely to be caused by errors in the analysis of the experiments and in the setup of the numerical simulations.…”
Section: Introduction Wells Turbines and Owc Systemsmentioning
confidence: 88%
“…In light of the discrepancies outlined in Section II, the authors of this note have considered important to verify the numerical results presented in older studies, noticing how none of them [11][12][13][14][15][16][17][19][20][21][22][23][24] presented an accurate analysis of the numerical errors due to temporal discretization. This appeared curious to say the least, given the importance of excluding any phase errors [41][42][43] in a study that deals with hysteresis.…”
Section: Revisiting the Cause Of The Hysteresismentioning
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