Optimal Design of a Centrifugal Compressor Impeller Using Evolutionary Algorithms

Table 3

Upper and lower bounds of the design variables.

Design variables	Minimum	Initial	Maximum
𝜙1, Ps3 [𝑟/𝑅2]	0.733	0.733	0.808
𝜙2, Ps4 [𝑧/𝑅2]	0.224	0.399	0.494
𝜙3, Ph3 [𝑟/𝑅2]	0.275	0.400	0.525
𝜙4, Ph4 [𝑧/𝑅2]	0.504	0.629	0.679
𝜙5, Pt3 [angle]	−40.0	−30.022	−5.0
𝜙6, Pt5 [angle]	15.0	46.949	70.0
𝜙7, Pb3 [angle]	−50.0	−39.754	−28.0
𝜙8, Pb6 [angle]	−50.0	80.409	90.0