Table 4: Orthogonal experiment schemes.

Number

(1)A1 (10)B1 (7)C1 (26)D1 (155)E1 (65)F1G1 (50)
(2)A1B2 (5)C2 (28)D2 (145)E2 (72)F2G2 (60)
(3)A1B3 (2)C3 (31)D3 (135)E3 (80)F3G3 (70)
(4)A2 (12)B1C1D2E2F3G3
(5)A2B2C2D3E3F1G1
(6)A2B3C3D1E1F2G2
(7)A3 (14)B1C2D1E3F2G3
(8)A3B2C3D2E1F3G1
(9)A3B3C1D3E2F1G2
(10)A1B1C3D3E2F2G1
(11)A1B2C1D1E3F3G2
(12)A1B3C2D2E1F1G3
(13)A2B1C2D3E1F3G2
(14)A2B2C3D1E2F1G3
(15)A2B3C1D2E3F2G1
(16)A3B1C3D2E3F1G2
(17)A3B2C1D3E1F2G3
(18)A3B3C2D1E2F3G1

Note. A is number of blades, B is blade tip clearance, C is width of blade, D is inlet blade angle, E is blade outlet diameter, F is vacancy, and G is inclination angle of blade outlet.