Research And Design Of The Rotors Of Tidal Energy Capture Based On The Offshore Cage System

For lack of electricity supply offshore cages cannot achieve automated control, therefore the low-speed tidal current in the breeding waters is applied to supply energy for cages, and a power generation of using tidal power with high power output is presented in this paper. Aimed at the rotor of tidal generation, systematic analysis and design were conducted. The main content and results of the research are as follows:The hydrological condition of offshore cages is analyzed, and a mathematical model of overall power output within semilunar period is established. Through the analysis and comparison, the S-type rotor was selected as the rotor of tidal generation on offshore cages. And the parameters of the rotor are designed preliminarily.A two-dimensional dynamic mathematical model of S-type rotor in the flow field is established and calculated through CFD. By analyzing the dynamic torque coefficient curve, the step of the S-type rotor is optimized. Meanwhile, through the analysis of the flow field simulation, the paper verify the S-rotor’s buffering effect, that the flow velocity is significantly reduced through the rotor.According to demand for electricity the overall dimensions of the rotor are determined. The force of tidal power generator is analyzed and checked, and a proper mooring system is designed to locate the device.Through the above analysis and design, a S-rotor model and its experimental devices was made to carry out a test in the sink. The experimental results show that, the rotor can self-start at the flow velocity of less than0.3m/s, but the power coefficient needs to be improved. The rotor of tidal energy generator can supply enough energy for offshore cages, and acts as the baffle of cages at the same time. This makes a very important significance for the industrial development of offshore cages.