Interaction between two horizontal axis tidal turbines in model scale – experiment and simulation
Keywords:Tidal turbine, Interaction, Model scale, CFD, Simulation, Experiment
Up to 6 Schottel Instream Turbines (SIT250) can be mounted on the tidal platform PLAT-I developed by Sustainable Marine Energy. Due to the close proximity of the turbines interactions can occur between them. Two horizontal axis tidal turbines in model scale are investigated experimentally and numerically to analyze these interactions. Experimental data were measured in a towing tank and consist of integral values for torque, thrust and rotational speed. Both a steady state and an unsteady three-dimensional Reynolds Averaged Navier Stokes (RANS) approach are utilized for simulating the turbine ﬂow ﬁeld. The ﬁrst part of the paper compares simulation results of a single turbine at different tip speed ratios with measurements to validate the numerical approach and its employed models. The second part analyses the interaction between two turbines. The axial distance in main ﬂow direction between the turbines is half the rotor diameter. The radial distance measured between the hubs of the turbines is varied in steps of 0.2 between 0.0 and 2.0 times the rotor diameter in the experiment and between 0.0 and 1.4 in the simulations. Measurements were conducted for tip speed ratios of 3, 4 and 5. In the simulations the tip speed ratio was ﬁxed at 4. The used simulation domain replicates the actual width and height of the towing tank and a sufﬁcient length up- and downstream of the turbines. The water surface is modeled with a free slip wall. Both thrust and torque are compared between simulation results and experimental data. Furthermore, a detailed analysis of the results and ﬂow ﬁeld in the numerical simulations is presented and the interaction between the turbines is discussed.
How to Cite
Copyright (c) 2022 Simon Joßberger, Christa Stadler, Ulf Barkmann, Nicholas Kaufmann, Stefan Riedelbauch
This work is licensed under a Creative Commons Attribution 4.0 International License.
I the author/we the authors understand that I/we retain copyright over our article. I/we grant a licence to IMEJ to: publish my/our article under the terms of the Creative Commons Attribution (CC BY) License which permits use, distribution and reproduction in any medium, provided the original work is properly cited, and identify IMEJ as the original publisher.