Title :
Research on numerical simulation of running characteristics on wells turbine for wave energy conversion device based on the OWC principle
Author :
Yu Chen ; Long Li ; Huiwen Liu
Author_Institution :
Coll. of Energy & Electr. Eng., Hohai Univ., Nanjing, China
Abstract :
In order to further study the principle of the wave energy generating set, 3D full channel numerical calculations were carried out of the Wells turbine used for the secondary energy conversion of the wave energy generating unit. The main investigated items included the relations among turbine performance and stagger angles, as well as different blade profiles in forward and reversed flow field respectively. The influences of blade setting angles on power efficiency and power output were studied in a constant flow direction. The optimal parameters of Wells turbine with different setting angles were obtained in bidirectional flow field. When the turbine´s stagger angle was β3 with different airfoils, analysis was performed regarding the fluctuation of power efficiency and power output by the change of the tip speed ratio. It seemed that the turbine with asymmetric profile blades performed better than the turbine with symmetric ones when the tip speed ratio was low. Steady numerical simulations were undertaken about the rotor with the stagger angle β3, by comparing the aerodynamics of a turbine with different blade airfoils in forward and reversed running conditions. The result was that symmetric profile blades suited better for the bidirectional flow condition than symmetric ones and generated a noticeable steady and high efficient working region.
Keywords :
aerodynamics; blades; numerical analysis; turbines; 3D full channel numerical calculations; OWC principle; Wells turbine; asymmetric profile blades; bidirectional flow condition; bidirectional flow field; blade airfoils; blade profiles; blade setting angles; constant flow direction; numerical simulation; power efficiency; power output; reversed flow field; running characteristics; tip speed ratio; turbine performance; turbine stagger angles; wave energy conversion device; wave energy generating unit; Blade Stagger Angle; Forward and Reversed Conditions; Numerical Simulation; Tip Speed Ratio; Wells Turbine;
Conference_Titel :
Fluid Machinery and Fluid Engineering, 2014 ISFMFE - 6th International Symposium on
Print_ISBN :
978-1-84919-907-0
DOI :
10.1049/cp.2014.1176