Dynamic stall control on a vertical axis wind turbine aerofoil using leading-edge rod
Dynamic stall control on a vertical axis wind turbine aerofoil using leading-edge rod
复制标题
使用前缘杆对垂直轴风力涡轮机翼型进行动态失速控制
DOI：
10.1016/j.energy.2019.02.176
复制
发表时间：
2019
期刊：
影响因子：
9
通讯作者：
Wang Yu
中科院分区：
文献类型：
--
作者：
Zhong Junwei;Li Jingyin;Guo Penghua;Wang Yu
提出了在对称翼型前缘安装小杆作为一种被动控制方法来控制达里厄垂直轴风力机涡轮机（DVAWT）的动态失速。采用SST k-ω湍流模型，通过求解非定常雷诺平均Navier-Stokes方程，对NACA 0018翼型和带杆翼型的绕流进行了数值模拟，研究了杆对Darrieus俯仰运动翼型动态失速控制的影响。数值模拟结果表明，从杆上脱落的反向旋转涡不断地向翼型边界层传递动能。该机理防止了动态失速涡的形成，消除了大迎角下翼型的流动分离。参数研究表明，杆的直径和杆与翼型之间的差距对翼型的失速控制和性能改善起着重要作用。在叶尖速比为2时，前缘杆的作用使振荡翼型的平均切向力系数相对提高了210.9%，使双叶DVAWT的功率系数相对提高了42.1%。
The installation of a small rod in front of the leading edge of the symmetrical aerofoil as a passive control approach was proposed to control the dynamic stall of the Darrieus vertical-axis wind turbine (DVAWT). The flows around original NACA 0018 aerofoil and that with a rod were extensively simulated by solving the unsteady Reynolds-averaged Navier-Stokes equations with an SST k-ω turbulent model to investigate the effect of the rod on the dynamic stall control of the aerofoils undergoing Darrieus pitching motions. Numerical simulation results reveal that the counter-rotating vortices shedding from the rod continuously transmit kinetic energy into the boundary layer of the aerofoils. This mechanism prevents the formation of dynamic stall vortex and eliminates the flow separation of the aerofoils at large angles of attack. Parameter studies show that the diameter of the rod and the gap between the rod and aerofoil play an important role in stall control and performance improvement of the aerofoil. With the aid of the leading-edge rod, up to 210.9% relative increment of average tangential force coefficient for oscillating aerofoil and 42.1% relative increment of power coefficient for a two-bladed DVAWT were achieved at a tip speed ratio of 2.