采用带转捩SST k-ω湍流模型,以S809翼型为研究对象,探讨纵荡运动方向、频率、幅度对复合运动（俯仰+纵荡）下动态失速的影响规律。结果表明：纵荡频率增加,迎风下的翼型湍动能增强,边界层流体的能量提高、扰动程度加深,使得翼型升力提高的同时提前失速;高纵荡频率工况下,迎风下的前缘涡强度高且覆盖范围广,加速了涡的脱落。顺风条件下,纵荡削弱了前缘涡的诱导效应,有效缩小尾缘涡的拓扑结构。随着纵荡幅度增大,翼型升阻力系数的响应幅值显著增加,尤其是在翼型迎风状态下的上仰阶段。研究揭示了纵荡运动对翼型动态失速的影响规律,对准确认识和评估漂浮式风力机气动性能具有重要意义。
Abstract
The transition model and SST k-ω turbulence model are used to study dynamic stall of S809 airfoil under the influence of hybrid motion （surge and pitch） with different surge directions, frequencies and amplitude. The results show that the turbulent kinetic energy of the airfoil is enhanced in the upwind case with increasing of surge frequency, the boundary layer energy is increased and the disturbance degree is deepened, which makes the airfoil stall in advance while the lift is increased. The higher the surge frequency is, the stronger and wider coverage leading-edge vortex is created in the upwind process, which accelerates the vortex shedding. The surge weakens the induction effect of the leading-edge vortex and effectively reduces the topology of trailing edge vortex in downwind process. With the surge amplitude increasing, the response amplitude of the lift and drag coefficient of the airfoil increases significantly, especially in the pitching up stage when the airfoil is upwind. This study reveals the dynamic stall characteristics of airfoil under the condition of surge motion, which is important to accurately understand and evaluate the aerodynamic performance of floating wind turbine.
关键词
风力机 /
空气动力学 /
数值模拟 /
纵荡运动 /
俯仰运动 /
动态失速
Key words
wind turbines /
aerodynamics /
numerical simulation /
surge motion /
pitching motion /
dynamic stall
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基金
国家自然科学基金（51876054; 52106239）; 江苏风力发电工程技术中心开放基金
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