Study On Aerodynamics Analysis Method Of Offshore Floating Wind Turbine

With the continuous growth of global energy demand and the continuous development of offshore wind power technology,the single capacity of offshore wind turbines is gradually increasing,and the installation location is gradually moving from offshore to deep sea.Therefore,the research on floating wind turbines has attracted more and more attention.The floating wind turbine is different from the stationary wind turbine,which will produce a large amplitude and complex motion response under the influence of environmental load such as wind waves and currents at sea.Therefore,it is necessary to study the calculation method of aerodynamic performance of the floating wind turbine.Floating type wind turbine,this paper puts forward a kind of evvh momentum theory improvement method based on the global coordinate system(G-BEM),and with OC3 floating the Hywind-NREL 5 mw wind turbine as the research object,the G-BEM method under various wind conditions and six degrees of freedom movement of the calculation results,and for the corresponding conditions to study the influence of wind turbine aerodynamic performance are discussed.G-BEM method need to wind turbine may affect the stream tube area of the grid,solve the center of each grid corresponding to the value of the wind turbine disk surface and according to the traditional evvh momentum theory to calculate the induced velocity distribution in the disk,resulting in each grid center position of the induced velocity,on the unsteady correction,through the analysis of the disturbance of wind turbine disk movement flow field,can draw wind turbine disk by load,torque.First,floating on the sea wind machine coordinate system is established,and discussed the six degrees of freedom movement for wind turbine disk on any position of relative inflow,the influence of the rotational speed,and based on the above theory method to write a complete G-BEM method to calculate program,and on the part of the traditional evvh momentum theory and compare the GH-BLADED software validation.Secondly,according to the different inclination of the disk and the condition of incoming wind,the reliability verification of the g-bem method in the case of stationary wind turbine was carried out,the calculation characteristics of the g-bem method in each working condition were analyzed,and the influence of different working conditions on the aerodynamic performance of the wind turbine was studied and discussed.Finally,the influence of six degrees of freedom motion on force,torque and center of gravity of the wind turbine is studied.With STAR-CCM+software and BEM program comparison results of the calculation of G-BEM method in the calculation of reliability is verified under various degrees of freedom,and the corresponding parameters for quantitative analysis of time domain,the average amplitude,the algorithm for subsequent application of the innovation to join tower,floating platforms,such as mooring calculation module to establish full coupling analysis program provides the basis and foundation.