Presenter Information

Weichao Shi, Newcastle University

Event Type

Event

Location

Sasakawa Auditorium

Start Date

25-1-2017 4:00 PM

End Date

25-1-2017 4:16 PM

Comments

The wavy leading edges or leading-edge tubercles of the humpback whale flippers can provide these large mammals with an exceptional manoeuvrability especially in securing their food. A wind tunnel test of a replica of these flippers has revealed that the leading-edge tubercles have largely a 3-D benefit for the finite hydrofoils, which can maintain the lift, deduce the drag and delay the stall angle. Afterwards, the concept has first been applied on wind and tidal turbine with the aid to improve the efficiency and the cut-in operating speed.

The paper is to demonstrate the effect on tidal turbine performance by applying these wavy leading-edge. Within this framework, an experimental test campaign has been conducted in Emerson Cavitation Tunnel, Newcastle University.

A set of tidal turbines with different leading-edge profiles was manufactured and tested to evaluate the hydrodynamic performance. The results showed that the models with the leading-edge tubercles had higher power coefficients at lower tip speed ratios (TSRs). Therefore, the tubercles can reduce the turbines’ cut-in speed to improve the starting performance. The biomimetic concept did not compromise the maximum power coefficient value of the turbine, being comparable to the device without the tubercles, but shifted the distribution of the coefficient over the range of the tip speed ratios tested. And several findings regards to various aspects of hydrodynamic performance will be elaborated in the paper.

 
Jan 25th, 4:00 PM Jan 25th, 4:16 PM

Biomimetic improvement of hydrodynamic performance for tidal turbines

Sasakawa Auditorium