Research On The Performance Of Savonius Rotor Under The Condition Of Wave-Current Coupling Effect

Ocean energy is a kind of clean renewable energy with abundant reserves.Under the background of energy crisis,the technology for exploiting ocean energy sources catches people's attention increasingly.Compared with other technologies to harvest ocean energy,using rotor to produce electricity is more mature.As a typical vertical axis drag driven rotor,Savonius rotor has been used in several projects for its design simplicity and flow direction independency.Classical Savonius rotor was chosen as a research subject in study.Considering the effect of wave,the performance of Savonius rotor was investigated by analyzing torque characteristics and power characteristics.According to wave theories,UDF was utilized to establish numerical wave-current tank in FLUENT.By comparing the numerical results with theoretical values,the reliability of numerical wave-current tank was validated.On the basis of numerical wave-current tank,the model of Savonius rotor was built and tested under the condition of current effect and wave-current coupling effect.The discrepancy in rotor's performance was compared and the influences of wave height,period,stream velocity and overlap ratio to rotor 's performance were analyzed.The results show that the influence of wave could improve rotor's performance;torque coefficient and power coefficient increase with the increasing of wave height;coupling phenomenon could be observed when the rotor rotating period and wave period meet a certain multiple,which lead to abnormal increases of torque coefficient and power coefficient.To validate conclusions of numerical analysis,an experiment was carried out.The results of the experiment were consistent with numerical analysis,which enhances the reliability of conclusions.