||The Performance Assessment of Wave and Tidal Array Systems (PerAWaT) project, launched in October 2009 with £8m of ETI investment. The project delivered validated, commercial software tools capable of significantly reducing the levels of uncertainty associated with predicting the energy yield of major wave and tidal stream energy arrays. It also produced information that will help reduce commercial risk of future large scale wave and tidal array developments.
Simulations elsewhere in the project indicate that a rotor within a duct of outer diameter D experiences lower thrust on the rotor plane than a rotor of the same diameter. Experimental evaluation of the influence of duct augmentation on performance is essential to i) provide confidence in this finding and ii) demonstrate that the PerAwaT modelling tools are relevant to the fundamental device concepts presently in development (i.e. OpenHydro AND open-centre rotors).
This work package addresses the design and specification of a series of experiments to assess the validity of CFD predictions of the effect of turbine augmentation by a duct. CFD simulations are analysed to determine the range of local thrust coefficients over which a measurable performance difference is observed and appropriate disc porosities are identified. The equipment required to conduct disc, duct and rotor experiments is summarised and a sequence of tests is proposed