浮式风机限制性耦合与全耦合数值计算

Restrictive Coupling and Full Coupling Numerical Calculation of Floating Wind Turbine

浮式风机上部风机与下部浮式平台通常是由不同的设计单位设计的,因此在进行浮式平台设计时无法获得上部风机参数,进而无法对浮式风机的水动力性能进行全耦合数值计算分析。为此,以OC3-Spar和OC4-Semi两种浮式风机为研究对象,通过在其不同位置施加不同等效载荷,设计不同的限制性耦合方式。在工作海况下对浮式风机进行限制性耦合计算,实现对浮式风机水动力性能的研究,并将所得结果与全耦合方式的计算结果进行对比。结果表明,在轮毂中心处施加风机等效推力对于单柱式和半潜式浮式风机而言均是最优限制性耦合方式。当采用该方式时,工作海况下2种浮式风机的时域结果均与全耦合计算结果具有较高的吻合度,响应谱频率分布与全耦合结果基本一致,但幅值均相差较大。

The upper wind turbine of the floating wind turbine and the lower floating platform are usually designed by different design units.Therefore,the parameters of the upper wind turbine cannot be obtained during the design of the floating platform,and thus the hydrodynamic performance of the floating wind turbine cannot be fully coupled for numerical calculation and analysis.Therefore,two kinds of floating wind turbines,OC3 spar and OC4 semi,are taken as the research objects,and different restrictive coupling methods are designed by applying different equivalent loads at different positions.In order to study the hydrodynamic performance of the floating wind turbine,the restrictive coupling calculation is carried out under the working sea state,and the results are compared with the calculation results of the full coupling method.The results show that applying the equivalent thrust of the wind turbine at the hub center is the optimal restrictive coupling method for both single column and semi submersible floating wind turbines.When this method is adopted,the time domain results of the two kinds of floating wind turbines under the working sea state are in good agreement with the fully coupled calculation results,and the frequency distribution of the response spectrum is basically consistent with the fully coupled results,but the amplitude difference is large.