Research On Dynamic Response And Aerodynamic Characteristics Of Floating Offshore Wind Turbine

Under the background of “Carbon Peak,Carbon Neutral”,the demand for green energy is increasing day by day,wind energy as a green and environmental renewable energy has been concerned by people.With the development of wind power generation technology,the wind turbine is gradually developing towards larger capacity and higher efficiency.Offshore Wind power can solve the problem of land space shortage,at the same time,offshore wind resource is stable,and can improve the efficiency of wind turbine.In order to give full play to the advantages of offshore wind power,offshore wind power is developed from tidal flat and offshore to deeper and farther sea area.The dynamic response and aerodynamic characteristics of the floating offshore wind turbine are very important for the safety of the unit,the Influence of dynamic response on the aerodynamic characteristics of wind turbine under different operating conditions is simulated and analyzed.The OpenFast code is used to simulate the dynamic response of barge-type,column-type and semi-submersible floating offshore wind turbines under different operating conditions.The simulation results show that the wind speed is the main influence factor of the output power,speed,pitch angle and the balance position of the wind turbine The wave period and wave height in different sea conditions directly affect the amplitude and frequency of the dynamic response of wind turbine,and the different wind wave dislocation angle verifies that the wave incident direction directly affects the amplitude of the dynamic response.The simulation results show that the pitching and pitching responses are the strongest among the different translational and rotational degrees of freedom.Of the three floating wind turbines,the semi-submersible offshore wind turbine has the most stable performance.Based on the simulation results of OpenFast code,a scale model was established to simulate the pitching and pitching motions of a wind turbine with a bottom swing mechanism.Experiments were conducted in a wind tunnel,the effects of pitching and pitching dynamic responses on the aerodynamic characteristics of a semi-submersible offshore wind turbine are studied.The influence of single-degree-of-freedom dynamic response on the performance of wind turbine is investigated by the experimental results.Based on the OpenFast code simulation and experimental results,the aerodynamic characteristics of the wind turbine are simulated by using the software of ANSYS.The simulation results show that pitching motion and pitching motion have great influence on the output power and horizontal thrust of the Wind Turbine.The Longitudinal motion will produce additional velocity,which will change the relative velocity of the Wind Turbine,and finally reflect that the output power and the horizontal force of the periodical Longitudinal motion wind turbine will also change periodically.The pitch motion will change the projected area of the wind turbine,at the same time,it will produce some additional angular velocity,which is reflected as the output power and the horizontal force of the wind turbine also change periodically.In addition,the Longitudinal motion and pitching motion of the wind wheel break the stability of the flow field and disturb the wake flow.The larger the amplitude and the shorter the period of pitching and pitching,the smaller the average output power and force,and the larger the variation range of the output power and the horizontal force on the wind turbine,the strong fluctuation of the aerodynamic load will have a great influence on the structural fatigue and control system of the wind turbine.The research of this paper can provide a theoretical basis for the floating offshore wind turbine to adjust the dynamic response of the wind turbine and the platform.