Extreme loading and associated survivability are key aspects of tidal turbines. This study focuses on the experimental investigation of extreme loads due to combined wave and current hydrodynamic loading and impact loads arising from collision with large sea animals. The design process and commissioning for reduced scale experiments to quantify such loads is described and preliminary findings are presented. The tidal device considered is a generic three bladed horizontal axis turbine. The scale of the model is approximately 1/15 relative to a typical full-scale turbine. The rotor is designed so that the thrust and power coefficient as a function of tip speed ratio represent a full-scale prototype and prior experiments. Blade design was carried out by combining an in-house blade element momentum code with a finite element analysis. Impact loads were estimated using a separate experimental apparatus consisting of a rotating arm, with similar inertia to that of the rotor, which hits a target with similar mechanical properties to those of a marine animal. Preliminary analysis indicates that impact loads are higher than hydrodynamic loads, by a factor of more than fifty for impact with a hard object. Impact with a deformable object, representing blubber of a marine, are lower but indicate negligible dependence on object mass and are greater than the predicted hydrodynamic loads. Experimental results from this campaign of tests will serve as benchmark data to validate computational fluid dynamics (CFD) of hydrodynamic loading and smooth particle hydrodynamic lattice spring modelling (SPH-LSM) of impact loading.
|Publication status||Published - 2015|
|Event||11th European Wave and Tidal Energy Conference (EWTEC2015) - Cité des Congrès de Nantes, Nantes, France|
Duration: 6 Sep 2015 → 11 Sep 2015
|Conference||11th European Wave and Tidal Energy Conference (EWTEC2015)|
|Period||6/09/15 → 11/09/15|
- tidal turbines
- wave power
- computational fluid dynamics
- marine animals
Payne, G., Stallard, T., & Martinez, R. (2015). Experimental investigation of tidal rotor loading due to wave, current and impact with sea animals. Paper presented at 11th European Wave and Tidal Energy Conference (EWTEC2015), Nantes, France.