图9. 扣除来流速度的叶尖区域流线计算结果($r_{0} = 0.6 c$, $a_{1 } = 0.002$)
Fig. 9. Computational result of streamlines in blade tip region with the wind speed subtracted from the local velocity ($r_{0} = 0.6 c$, $a_{1 } = 0.002$)