An Experimental Survey in the Wake of a Horizontal Axis Tidal Turbine
This scientific poster was presented at the 4th INORE symposium, which was held in Dartmouth, England, on 9-14 May 2010.
Abstract: Similar to wind turbines, it is planned that tidal stream energy devices will be deployed in arrays or ‘tidal farms’. However, before industry can progress to this stage, more information is required on the optimum spacing between tidal turbines. This paper contributes to the required knowledge by investigating the characteristics of the wake produced by a horizontal axis tidal turbine. Details of a 10th scale towing test conducted in a lake, devised to measure the wake generated by a horizontal axis tidal turbine, are presented. As a simplification of the marine environment, the lake provides the steady, uniform flow conditions required to quantify and understand the wake produced by the tidal device. A 16m long x 6m wide twin-hull catamaran was constructed for the test programme. This doubled as a towing rig and instrument measurement platform, providing a fixed frame of reference for measurements in the wake of the turbine. Velocity mapping was conducted using acoustic Doppler velocimeters (ADV) and acoustic Doppler current profilers (ADCP). It is recognised that both the turbine support structure and rotor contribute to the wake generated. Therefore, measurements were made with both the rotor attached and removed to quantify the effects of the support structure on the wake.
Keywords: ADV, flow, turbine, wake
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