纵荡对漂浮式风力机叶片动态失速影响研究  

Effect of surge motion on the dynamic stall of floating offshore wind turbine blades

作　　者：刘岩[1] 赵振宙[2] 刘一格 王丁丁 李世君 苏纯浩 LIU Yan;ZHAO Zhenzhou;LIU Yige;WANG Dingding;LI Shijun;SU Chunhao(School of Electrical and Power Engineering,Hohai University,Nanjing 211100,China;College of Renewable Energy,Hohai University,Changzhou 213200,China)

机构地区：[1]河海大学电气与动力学院,南京211100 [2]河海大学新能源学院,江苏常州213200

出　　处：《振动与冲击》2024年第22期31-36,61,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(52376179,12102125);江苏省研究生科研创新基金(KYCX23_0678)。

摘　　要：纵荡较明显地改变了漂浮式风力机的气动性能,也使局部翼型的绕流场发生剧烈变化,翼型产生动态失速的机理复杂化。以S809翼型为研究对象,从向后纵荡与下俯、向前与下俯、向后与上仰和向前与上仰四种复合运动、f_(y)=0.083 Hz和f_(y)=0.121 Hz两种纵荡频率,来分析纵荡对动态失速过程中的迟滞响应特性、翼型表面分离涡和荷载变化的影响规律。结果表明:纵荡方向影响翼型动态失速变化趋势,向后纵荡时翼型附近流体对边界层施加向下作用力,抑制分离涡产生;向前纵荡导致失速提前,形成大规模分离涡,流场迟滞响应明显。纵荡频率影响升阻力幅值大小,升阻力系数随纵荡频率增加而非定常程度加大。The surge motion significantly affects the floating offshore wind turbine's aerodynamic performance and the flow field around the blade.The mechanism underlying the dynamic stall of the airfoil is complex.The S809 airfoil was analysed as a research object.Four pitch and surge coupled motions were produced:backward surge and downward pitch,forward surge and downward pitch,backward surge and upward pitch,and forward surge and upward pitch.Two surge frequencies were considered:f_y=0.083 Hz and f_y=0.121 Hz.The analysis focused on the effects of different coupled motions on the hysteresis response characteristics,separation vortex on the airfoil surface,and load changes during the dynamic stall of the airfoil.The results indicate that the surge direction affects the dynamic stall trend of the airfoil.When the surge motion is backward,the airflow near the airfoil exerts a downward force on the boundary layer,preventing the generation of the separation vortex.A forward surge motion advances the stall,creates a large separation vortex,and results in a large hysteretic response of the flow field.The surge frequency affects the lift and drag amplitude,and the unsteady lift and drag coefficients increase with the surge frequency.

关 键 词：风力机翼型 纵荡运动 俯仰运动 动态失速 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]