Validation of the dynamic load characteristics on a Tidal Stream Turbine when subjected to wave and current interaction - Data

<p>Datasets describe the results of an experimental test campaign conducted at the wave-current flume at IFREMER, Boulogne-Sur-Mer, France. A 1:20^th scale horizontal axis tidal turbine was tested over a range of flow and operating conditions. The turbine was 3-bladed and had a diameter of 0.9m. Numerical results are also included using the same flow conditions and turbine operational settings. CFD models were developed using ANSYS CFX.</p><p>Five types of flow condition were tested:</p><ul><li>Uniform (U) current-only: target of 1m/s uniform flow, no waves, turbine operating over a range of TSRs</li><li>Profile1 (P1) current-only: target of 1m/s flow, high shearing velocity profile over the water depth, no waves, turbine operating over a range of TSRs</li><li>Profile 2 (P2) current-only: target of 1m/s flow, low shearing velocity profile over the water depth, no waves, turbine operating over a range of TSRs</li><li>Profile 1 Wave 1 (P1W1) wave-current: target of 1m/s flow, high shearing velocity profile over the water depth, Stokes 2^nd Order Theory waves (Wave1: wave height = 0.09m, wave period = 2.566s, wavelength = 9.07m), turbine operating over a range of TSRs</li><li>Profile 2 Wave 2 (P2W2) wave-current: target of 1m/s flow, low shearing velocity profile over the water depth, Stokes 2^nd Order Theory waves (Wave2: wave height = 0.11m, wave period = 1.917s, wavelength = 5.61m), turbine operating over a range of TSRs</li></ul><p><strong><u>Experimental - U current-only flow:</u></strong></p><ul><li>Experimental data detailing Analog and Motor data from the turbine measurement systems.</li><li>Analog Data = Thrust (N), Blade 2 out of plane bending moment (Nm), Time (s), Torque (Nm)</li><li>Motor Data = Time (s), Turbine Angular Velocity (RPM), Encoder position (degrees)</li><li>Fields 1-10 refer to the turbine operating at a specific Tip Speed Ratio (TSR) as shown in the table below.</li></ul><p><br></p><p>FlowDATA_Uniform_CurrentOnly_Velocity_Exp.mat</p><ul><li>Experimental flow velocity data measured using 2D Laser Doppler Anemometry (LDA).</li><li>LDA1 = vertical velocity (v) y-direction, LDA2 = streamwise velocity (w) z-direction (m/s)</li><li>Runs 1-10 refer to the LDA being placed at a specific water depth (m) given as a distance from the water surface.</li></ul><p><br></p><p><strong><u>Experimental - P1 current-only flow:</u></strong></p><ul><li>The same description of the measured parameters as the U current-only flow case.</li><li>Fields 1-7 refer to the turbine operating at a specific Tip Speed Ratio (TSR.</li></ul><p><br></p><ul><li>The same description of the measured parameters as the U current-only flow case.</li><li>Runs 1-7 refer to the LDA being placed at a specific water depth (m) given as a distance from the water surface.</li></ul><p><br></p><p><strong><u>Experimental – P2 current-only flow:</u></strong></p><ul><li>The same description of the measured parameters and TSR’s tested as the P1 current-only flow case.</li></ul><ul><li>The same description of the measured parameters and LDA positions as the P1 current-only flow case.</li></ul><p><strong><u>Experimental - P1W1 wave-current flow:</u></strong></p><ul><li>The same description of the measured parameters and TSRs as the P1 current-only flow case.</li></ul><ul><li>The same description of the measured parameters and LDA positions as the P1 current-only flow case.</li></ul><ul><li>Experimental water surface elevation (m) data measured using a wave probe.</li><li>Runs 1-7 refer to the wave probe measuring 7 repeat tests while the turbine is operating at different TSRs.</li></ul><p><strong><u>Experimental – P2W2 wave-current flow:</u></strong></p><ul><li>The same description of the measured parameters and TSRs as the P2 current-only flow case.</li></ul><ul><li>The same description of the measured parameters and LDA positions as the P2 current-only flow case.</li></ul><ul><li>Experimental water surface elevation (m) data measured using a wave probe.</li><li>Runs 1-7 refer to the wave probe measuring 7 repeat tests while the turbine is operating at different TSRs.</li></ul><p><strong><u>CFD - U current-only flow:</u></strong></p><ul><li>Numerical CFD data detailing the thrust (N) and torque (Nm) on each of the turbine blades and hub for TSRs 0-7, and out of plane bending moment (BMx) (Nm) on a single blade at TSR 4 where:<ul><li>Force 1, 2, 3 & Hub = Thrust on Blade 1, 2, 3 & Hub</li><li>Torque 1, 2, 3 & Hub = Torque on Blade 1, 2, 3 & Hub</li><li>TorqueX1up = BMx on a single blade</li></ul></li></ul><ul><li>Numerical CFD flow velocity data measured 1.5m upstream of the turbine location using monitor points placed in the flow.</li><li>Vertical velocity (v) y-direction, Streamwise velocity (w) z-direction (m/s)</li></ul><p><strong><u>CFD – P1 current-only flow:</u></strong></p><ul><li>Numerical CFD data detailing the thrust (N) and torque (Nm) on each of the turbine blades and hub, and out of plane bending moment (BMx) (Nm) on a single blade at TSR 4 where:<ul><li>Force 1, 2, 3 & Hub = Thrust on Blade 1, 2, 3 & Hub</li><li>Torque 1, 2, 3 & Hub = Torque on Blade 1, 2, 3 & Hub</li><li>TorqueX1up = BMx on a single blade</li></ul></li></ul><ul><li>Numerical CFD flow velocity data measured 1.5m upstream of the turbine location using monitor points placed in the flow.</li><li>Vertical velocity (v) y-direction, Streamwise velocity (w) z-direction (m/s)</li><li>Monitor points numbered C21 – C219 which means: C – central in the width across the flume (x diection), 2 – 2m downstream of inlet boundary (1.5m upstream from turbine location) (z-direction), 1 – 19 number vertical points though the water depth (y-direction) with 1 corresponding to -1.9m from the water surface and 19 corresponding to -0.1m from the water surface (at increments of 0.1m).</li></ul><p><strong><u>CFD – P2 current-only flow:</u></strong></p><ul><li>The same description of the measured parameters and TSRs as the P1 current-only flow case.</li></ul><ul><li>The same description of the measured parameters and monitor point positions as the P1 current-only flow case.</li></ul><p><strong><u>CFD - P1W1 wave-current flow:</u></strong></p><ul><li>The same description of the measured parameters and TSRs as the P1 current-only flow case.</li></ul><ul><li>The same description of the measured parameters and monitor point positions as the P1 current-only flow case.</li></ul><ul><li>Numerical water surface elevation (m) data over the full domain length measured at individual time steps over the time range 55 – 60 seconds. Files are numbered with the timestep iteration number.</li><li>Each file gives the coordinates of the water surface over the length of the domain. The turbine is located at z = 3.88m so these coordinates can be used to find the y-coordinate for each time step and therefore the wave surface elevation over time.</li></ul><p><strong><u>CFD – P2W2 wave-current flow:</u></strong></p><ul><li>The same description of the measured parameters and TSRs as the P2 current-only flow case.</li></ul><ul><li>The same description of the measured parameters and monitor point positions as the P2 current-only flow case.</li></ul><ul><li>The same description of the measured parameters as the P1W1 wave-current flow case.<br></li></ul><br><p>Research results basedupn these data are pubished at https://doi.org/10.1016/j.oceaneng.2020.108360</p><p><br></p>