were carried out on two typical examples of cross-sectional configuration:
NACA0018 without any curvature and Magatama-type (Magatama is an ancient
Japanese accessory) (Ninomiya and Yoshioka 2020a, b). Figure 12.8 shows the
blade setting angle β and the azimuth angle Ψ . If the blade is set along the
circumferential direction, we have β ¼ 0
, whereas β ¼ 90
, if the blade is set along
Fig. 12.8 Definition of blade setting angle β and azimuth angle Ψ
a = 0°
a = 0°
a = 0°
a = 0°
a = 0°
a = 90°
= 0°
= 90°
= 180°
= 270°
l = 0
l = ∞
a = 270°
a = 180°
Fig. 12.9 Relation between α and Ψ
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T. Sakai et al.