A model is presented for assemblies of ducted vertical-axis tidal turbines, arranged as a two-dimensional semi-permeable barrier. The choice of the correct contraction ratio of the convergent, together with the design features of the vertical-axis turbine, results from a compromise between blockage, by-pass flow and power output. The barrier/turbine assembly is designed to determine, in subcritical conditions (Fr<1), a measurable downstream local decrease of the sea level. In order to predict the overall pressure loss of the assembly, this last is modelled separately in its three components: convergent, turbine and diffuser. The most relevant pressure loss is due to the enhanced-velocity vertical axis turbine; the pressure loss was predicted using a Blade Element turbine Model (BEM), with results matched against published performance data by a manufacturer. Finally, a study for model validation by means of physical tests in reduced scale to be performed in a laboratory flume is presented.

A model for semi-permeable barriers with velocity-enhanced vertical-axis turbines for tidal streams / fiaschi d., manfrida g, talluri L.. - ELETTRONICO. - 1:(2017), pp. 1-9. (Intervento presentato al convegno 9th European Seminar OWEMES 2017 tenutosi a Bari nel 11/10/2017).

A model for semi-permeable barriers with velocity-enhanced vertical-axis turbines for tidal streams

fiaschi d.;manfrida g;talluri L.
2017

Abstract

A model is presented for assemblies of ducted vertical-axis tidal turbines, arranged as a two-dimensional semi-permeable barrier. The choice of the correct contraction ratio of the convergent, together with the design features of the vertical-axis turbine, results from a compromise between blockage, by-pass flow and power output. The barrier/turbine assembly is designed to determine, in subcritical conditions (Fr<1), a measurable downstream local decrease of the sea level. In order to predict the overall pressure loss of the assembly, this last is modelled separately in its three components: convergent, turbine and diffuser. The most relevant pressure loss is due to the enhanced-velocity vertical axis turbine; the pressure loss was predicted using a Blade Element turbine Model (BEM), with results matched against published performance data by a manufacturer. Finally, a study for model validation by means of physical tests in reduced scale to be performed in a laboratory flume is presented.
2017
9th European Seminar OWEMES 2017
9th European Seminar OWEMES 2017
Bari
11/10/2017
fiaschi d., manfrida g, talluri L.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1116920
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