Table 1 Factor level table.

From: Optimization design of hump phenomenon of low specific speed centrifugal pump based on CFD and orthogonal test

Levels

Factors

\(A\)

\(B\)

\(C\)

\(D\)

\(D_{2} /{\text{mm}}\)

\(b_{2} /{\text{mm}}\)

\(Z\)

\(\beta_{2} /^\circ\)

1

290

13

5

24

2

295

11

6

26

3

300

9

7

22

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