Hydrodynamic performance measurements of Schottel Hydro model turbine (TTT3 Project)

This report presents the results of model tests carried out at CNR- INSEAN to study the hydrodynamic performance of a model turbine representative of the Schottel Hydro SIT 250 design. The activity has been performed in the framework of the research project TTT3 (Tidal Turbine Testing 3) funded by Invest Northern Ire- land, and coordinated by Queen's University of Belfast. Partial funding has been provided by the CNR-INSEAN Project ULYSSES. Model tests on a 500 mm diameter model turbine (1:8 scale) have been performed in the depressurised Circulating Water Channel (CWC). Ob- jective of tests was to characterize turbine performance over a variety of operating conditions and system layout, including variable onset ow speed (up to 2.75 m/s), yaw angle from zero to 15 degrees, and variable immersion between 0.5 D (blade tip piercing free surface) and 1.5 D. Results of model tests also provide qualitative information about the sensitivity of turbine performance to blade surface roughness. Measurements described in this report are useful to analyse scale and testing environment e ects by comparing performance of the 500 mm diameter model (reported here), and from the 1.5 m diameter model tested at both CNR-INSEAN towing tank, and in the eld site at Strangford Lough, NI.