| Tidal current energy is one of the richest marine energy in the world, which isbenefit to the energy crisis and environmental problems. More and more attentions arebeing paid on how to extract energy from tidal current. However, the performance ofhorizontal axis marine current turbine can be affected by complicated marineenvironment. In order to verify the safety of the current turbine, the performance ofhorizontal axis marine current turbine under complicated conditions must be studiedfirstly. By using the method of wind turbines for reference, the power coefficient ofcurrent turbine is lower in actual operation. The blade is a key component ofhorizontal axis current turbine, thus the optimal design of blade is the primary task ofthe current turbine design.In developing50kW horizontal axis turbine tidal turbine unit, the basic theoriesof blade design and parameters analysis are introduced, and the parameters of50kWturbine blade are got by using Blade Element Momentum theory and Wilson mothod.Thus three-dimensional entities are obtained using3D design software. The tidalcurrent energy turbine characteristics are obtained using Computational FluidDynamics software Fluent. The change rules of the performance of current turbineunder complicated conditions are built by results.Considering the specific operating environment, an optimization model with theobjective of maximum average power coefficient is established in the range of waterspeed by genetic algorithm. Using the optimized blade, the power coefficient isimproved rapidly and meets the design requirements. Compared with the originalblade model, the effectiveness of the method had been verified.Using the optimized blade, static strength, modal characteristics and fatigue lifeare analyses by finite element method. The FEM results verified the stability of theblade under the limit load and check structural strength and rigidity to ensure stableoperation of turbine blades. |
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