|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.
This report concerns the design of an array emulator to represent the rate of change of momentum due to energy extraction by an array of tidal stream turbines. An array emulator has been designed comprising a strip of identical circular discs of defined geometric porosity. Experiments are conducted with a multitude of discs to identify the variation of thrust coefficient on a single disc with geometric porosity. Thrust varies with geometric porosity, Reynolds number and blockage.