752931.fig.0020a
(a)
752931.fig.0020b
(b)
752931.fig.0020c
(c)
752931.fig.0020d
(d)
752931.fig.0020e
(e)
752931.fig.0020f
(f)
Figure 20: Relative velocities along the blade-to-blade at the mid span: (a) , (b) , (c) , (d) , (e) , and (f) .