摘 要：为分析螺旋侧板在漂浮式风力机Spar平台运动时的抑涡效果，采用动网格技术，对低雷诺数下原型平台及附有螺旋侧板平台在均匀来流中横向受迫振荡进行数值模拟，分析其在不同振幅比、不同振荡频率比下的锁定范围、受力情况及尾涡结构的变化特性。研究表明：振幅比L=0.2时，附有螺旋侧板平台的锁定范围相比原型平台有所减小，振幅比增大到L=0.4时，原型平台锁定范围随之增加，附有螺旋侧板平台主要受自身强迫振荡控制，不再出现卡门涡街现象；振幅比L=0.2、0.4时，2种平台尾涡均为“2S”结构，相同频率比下，附有螺旋侧板平台尾涡发放更为缓慢，说明螺旋侧板有一定抑涡效果；随频率比增大，2种平台升力系数的相位差减小，其与平台位移曲线之间的相位也发生改变，同时，振幅比也对平台升力系数曲线与位移曲线之间的相位产生影响。

Abstract: In order to study the helical strakes’ suppression effects on the vibration of Spar platform of floating wind turbine,,the forced oscillations in the steady flow of prototype Spar platforms and in that with helical strakes at low Reynolds number are numerically simulated with the dynamic meshing technology. The analysis is focused on the lock-in range,as well as the force status and trailing vortex structure under different amplitude and frequency ratios. Results show with amplitude ratio L=0.2,the Spar platform with helical strakes has smaller lock-in range than prototype platform. As the amplitude ratio increases to L=0.4,the lockin scope of prototype platform increases accordingly,and the platform with helical strakes is controlled by its own oscillation without presence of Karman vortex street. With amplitude ratios of L=0.2 and 0.4,the trailing vortex structures of both platforms appear in “2S” shape. At the same frequency ratio,the vortexes from the platform with helical strakes are released more slowly than the prototype platform,indicating helical strakes have certain suppression effect. As frequency ratio increases,the phase difference of lift coefficients between two platforms is reduced,and the phase with displacement curves is also changed.Additionally,the amplitude ratio affects the phase difference as well.

TK83

国家自然科学基金（51676131，51176129）