Research on Blade Design of Lift–Drag-Composite Tidal-Energy Turbine at Low Flow Velocity

The research on tidal-current energy-capture technology mainly focuses the conditions of high flow velocity, focusing use differential pressure lift, while average velocity in most sea areas China is less than 1.5 m/s, especially marine aquaculture area, where energy needed to provide green locally. Due low this type it seriously affects effect which conducive exerting impact resistance. In regard, coupling lift and resistance blade torque comprehensively considered, puts forward design method lift-–drag-composite thin-plate arc turbine blade. Based element momentum (BEM) theory Bernoulli’s principle, dynamic model was established, nonlinear optimization used solve shape parameters blades, NACA airfoil turbines were trial-produced under same conditions. A experiment carried out experimental pool, Xiangshan area Ningbo, East Sea taken as area. results two experiments showed trend, indicating that energy-harvesting performance lift–drag-composite significantly better small radius, verified correctness method, can promote development tidal radius.