Investigation of New Design Principles for the Centrifugal Compressor Vaned Diffusers

Table 3

Case of pressure ratio 2.2 Compressor.

Compressor stage
Design mass flow	md =0.45 kg/s
Total pressure ratio	π =2.2
Isentropic efficiency	ηi =77%
Impeller
Rotating speed	N =47000 r/min
Number of blades	ZI =12full+12splitter
Exit diameter	D2 = 143 mm
Back sweep angle	β =25 deg
Exit tip speed	U2 = 210 m/s
Radial diffuser
Number of vanes	ZD = 21
Inlet/outlet radius ratio	R3/R4 = 0.815
Inlet metal angle	α = 22 deg