Investigation of New Design Principles for the Centrifugal Compressor Vaned Diffusers

Table 2

Case of pressure ratio 8 compressor.

Compressor stage
Design mass flow	md =1.7 kg/s
Total pressure ratio	π =8.0
Isentropic efficiency	ηi =80%
Impeller
Rotating speed	N =54000 r/min
Number of blades	ZI =11full+11splitter
Exit diameter	D2 = 217 mm
Back sweep angle	β =30 deg
Exit tip speed	U2 = 614 m/s
Radial diffuser
Number of vanes	ZD =23
Inlet/outlet radius ratio	R3/R4 = 0.746
Inlet metal angle	α =13 deg