OPERA delivers bi-radial turbine lab test results

IST 55kW V-flow turbine test rig representation (Image: OPERA)

 
OPERA wave energy project has released a document outlining the tests performed at the Instituto Superior Técnico (IST) with the bi-radial turbine generator set and its built-in high-speed safety valve.

The turbine underwent the testing program at IST in April 2017, before being shipped to the Mutriku wave power plant for further validation.

The OPERA novel bi-radial turbine was designed to maximize the amount of energy absorbed from the waves, while taking into account its own rotation-speed-dependent aerodynamic efficiency and the efficiency of the electrical equipment under the widely varying sea states that characterize the local wave climate.

The aim of the turbine, produced by Kymaner, is to increase oscillating water column (OWC) annual mean efficiency by 50% and improve the reliability of the PTO in comparison with the most frequently used options.

Results from the turbine’s dry tests showed that the experimental values for the efficiency are fairly close to those predicted by the computational fluid dynamics (CFD) calculations, thus validating the turbine design method, it is stated in the tests summary document.

Electrical generator efficiency tests showed that very high efficiency is achieved in a wide range of rotation speeds and power, but a sharp drop of efficiency is observed for low power and low rotation speed.

Also, OPERA informed that HSSV valve safety control algorithm was implemented in order to shave power peaks under extreme wave conditions. Results showed that an aggressive valve control strategy successfully reduced any power peaks, which allowed the continuous operation of the turbine, even under excessively energetic wave climates.

Following the trials at the Mutriku wave power plant, Kymaner’s bi-radial turbine will be moved to Bimep for additional testing on Oceantec’s floating wave energy converter.

Project OPERA (Open Sea Wave Operating Experience to Reduce Energy Cost), coordinated by Tecnalia and Ente Vasco de la Energía (EVE), involves the consortium of 12 members working together to halve the cost of wave energy.

Share this article

Follow Tidal Energy Today

Events>

<< Jan 2018 >>
MTWTFSS
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31 1 2 3 4

Waterpower Week 2018

This 3-day jam packed event provides you the opportunity to network, learn about legislative and regulatory initiatives, and discuss…

read more >

Marine Moorings Masterclass – STORM project

Funded by Innovate UK, the STORM (Specialised Thimbles for Offshore Renewable Marine energy) project is aiming to design a new multi-material…

read more >

RenewableUK Wave & Tidal 2018

The event will bring together leading developers, OEM’s, financial and innovation funding experts, technical and safety professionals…

read more >

Scottish Renewables Annual Conference

Scottish Renewables’ Annual Conference 2018 will take place against a background of these debates and examine in detail what these changes…

read more >