Testing of Tidal Turbines 3 (TTT3)

Nortek is proud to be included in the TTT3 program with Queen’s University Belfast in the dynamic Strangford Narrows.
Testing of Tidal Turbines 3 (TTT3)

Tidal turbine experiment at TTT3

The TTT3 project is the third round of the international program for Testing Tidal Turbines.  TTT3 builds upon the experience and results from deployment of two 1/10th scale horizontal axis tidal turbines. The ambitious TTT3 project will deploy a 1.5 m diameter turbine in real tidal conditions at Strangford Narrows, Northern Ireland, and in idealised flow conditions at the large, calm water towing tank in CNR-INSEAN, Italy.  The Nortek Signature1000 AD2CP was selected for mean flow and turbulent kinetic energy (TKE) measurements because of its high accuracy and maximum sampling rate of 16 Hz.

The Nortek Signature1000 will be located two turbine-diameters (2D) upstream of the turbines rotor in accordance with IEC62600-200 standard. The high-resolution TKE and mean velocity measurements provided by the instrument will be synchronised with the turbine’s torque and thrust performance.

Flow characteristics in the wake of the turbine are also a key part of this project. The Nortek Signature1000 will be mounted 2D downstream of the rotor enabling a comparison between the free stream flow and flow in the turbine’s wake to be characterised. To accomplish this, the Signature1000 will be deployed from the barge pointing downwards, 0.5 m below the surface, recording the entire water column to the seabed 10 m below the surface.

TTT3 Strangford Narrows
TTT3 Schematic



The Signature1000 may also be used in a bottom frame for resource assessment according to the IEC62600-200 standard. The five beams featured on the Signature1000 offer improved vertical velocity measurements, and the ability to resolve smaller turbulence length scales in the in the vertical axis. The Signature1000 has excellent spatial and temporal resolution making it very appropriate for this project.  With a cell size of 0.2 m and 16 Hz sampling frequency it will capture the flow experienced upstream and downstream of the turbine in great detail.

These studies are key to industry and academia alike in validating numerical models and enabling the marine energy sector to reduce risk, innovate and grow. Previous work by Queen’s University Belfast researchers has been disseminated at international conferences and journal publications (P. Jeffcoate, 2015;  P. Jeffcoate, 2016). The project is supported by public and industrial partners such as InvestNI, Applied Renewables Research, Schottel Hydro, Sustainable Marine Energy, Oceanflow Energy, QED Naval, McLaughlin and Harvey, Joules and ORE Catapult.