Titolo:  A critical examination of the hysteresis in wells turbines using computational fluid dynamics and lumped parameter models
Data di pubblicazione:  2020
Autori:  Ghisu, T.; Cambuli, F.; Puddu, P.; Virdis, I.; Carta, M.; Licheri, F.
Numero degli autori:  6
Lingua:  Inglese
Presenza coautori internazionali:  no
Volume:  142
Fascicolo:  5
Pagina iniziale:  1
Pagina finale:  14
Numero di pagine:  14
Digital Object Identifier (DOI):  http://dx.doi.org/10.1115/1.4046379
Codice identificativo Scopus:  2-s2.0-85083499070
Codice identificativo ISI:  WOS:000566851700011
URL:  https://asmedigitalcollection.asme.org/offshoremechanics/article-abstract/142/5/052001/1074617/A-Critical-Examination-of-the-Hysteresis-in-Wells?redirectedFrom=fulltext
Abstract:  The hysteretic behavior of oscillating water column (OWC)-installed Wells turbines has been known for decades. The common explanation invokes the presence of unsteady aerodynamics due to the continuously varying incidence of the flow on the turbine blades. This phenomenon is neither new nor unique to Wells turbines, as an aerodynamic hysteresis is present in rapidly oscillating airfoils and wings, as well as in different types of turbomachinery, such as wind turbines and helicopter rotors, which share significant similarities with a Wells turbine. An important difference is the non-dimensional frequency: the hysteresis appears in oscillating airfoils only at frequencies orders of magnitude larger than the ones Wells turbines operate at. This work contains a re-examination of the phenomenon, using both computational fluid dynamics (CFD) and a lumped parameter model, and shows how the aerodynamic hysteresis in Wells turbines is negligible and how the often measured differences in performance between acceleration and deceleration are caused by the capacitive behavior of the OWC system. Results have been verified with respect to both spatial and temporal discretization, for unstalled and stalled operating conditions.
Parole chiave:  computational fluid dynamics; ocean wave energy technology; lumped parameter model; verification and validation; Wells turbines
Tipologia: 1.1 Articolo in rivista

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