Performance Analysis of Archimedes Spiral Hydrokinetic Turbine
Tidal current energy technology is one of the fastest growing renewable energy technologies.Traditional tidal turbines are usually designed to operate at relatively high current speeds,making it difficult for them to cope with power generation tasks in low-speed marine areas.The archimedes spiral hydrokinetic turbine(ASHT)is a newly proposed,economically viable,and environmentally friendly hydrodynamic power generation device that offers a promising opportunity for utilizing low-speed tidal currents.Aiming to explore the performance characteristics of ASHT,computational fluid dynamics and one-way fluid-structure coupling numerical simulations of five ASHTs with different blade angles are carried out.The results show that the peak power coefficients of five ASHTs are all in the low tip speed ratio range,and the 30-45-60 has the best peak power coefficient among them.The ASHT with a large blade angle has a wider operating tip speed ratio range and a higher thrust coefficient,its tip speed ratio point of peak power coefficient has shifted to a higher position.The ASHT with a large blade angle has stronger flow blockage effect.The loads acting on ASHT will have periodic vibration under the combined action of hydrodynamics,gravity and rotation effect.Moreover,the ASHT with a large blade angle also has a higher load fluctuation.The research results reveal the performance characteristics of ASHT,and provide a reference for the optimal design and promotion application of this type of hydrokinetic turbine.
tidal current energyarchimedes spiral hydrokinetic turbine(ASHT)blade anglenumerical simulation