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Wavesax Device – Pto Optimization by Wave Basin & Numerical Modelling Studies

pubblicazioni - Presentazione

Wavesax Device – Pto Optimization by Wave Basin & Numerical Modelling Studies

Il WaveSAX è un dispositivo a colonna d’acqua oscillante (OWC) concepito per essere installato in porti e porti del Mediterraneo. La sua particolarità sta nella turbina d’acqua bidirezionale Wells. A seguito dei test effettuati presso il bacino d’onda CNR-INSEAN, è diventato fondamentale analizzare a fondo l’efficienza elettromeccanica del prototipo di PTO 1:5. Questo è importante sia per l’analisi delle prestazioni raggiunte sia per l’identificazione delle interazioni dinamiche tra la PTO e l’idraulica della turbina, in modo che una più profonda comprensione dei fenomeni coinvolti possa portare a specifiche più dettagliate per la progettazione e la costruzione del WaveSAX Wave Energy Converter in scala reale.

The WaveSAX is a oscillating water column (OWC) device that has been conceived to be installed in ports and harbours in the Mediterranean sea. Its particularity lies in the bi-directional Wells water turbine. Following thetests performed at the CNR-INSEAN wave basin, it has become fundamental to deeply analyse the electromechanical efficiency of the 1:5 prototype PTO. This is important both for the analysis of the performances reached both for the identification of the dynamic interactions between the PTO and the turbine hydraulics, so that a deeper understanding in the phenomena involved can lead to more detailed specifications for the design and construction of the full scale WaveSAX Wave Energy Converter.

This paper presents the tests of the 1:5 wave basin experiments, aiming to analyse the performance of the device using different turbine configurations and PTO control strategies. The results showed the goodness of theangular velocity control strategy rather than the torque control one, that based on the continuous monitoring of mechanical and electrical parameters, allows to set the turbine in the best rotational speed that maximise theelectric power generation.

Furthermore, The WaveSAX device design has been optimized, improving the conversion of wave energy into mechanicalenergy in the turbine axis. Numerical analyses carried out with ICEM-CFD (ANSYS) on the geometry of the water intake (Figure 4) and the number of blades of the turbine. The results showed that an increase in the areaof the intake section increases the water flow entering the device. However, the relationship between these two quantities is not linear, especially if the entrance area reaches sufficiently large dimensions.The outcomes have been finally used for the design of the full-scale WaveSAX.

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