Investigation of New Design Principles for the Centrifugal Compressor Vaned Diffusers

Table 1

Case of pressure ratio 4 compressor.

Compressor stage
Design mass flow	md =4.54 kg/s
Total pressure ratio	π =4.0
Isentropic efficiency	ηi =83.3%
Impeller
Rotating speed	N =21789 r/min
Number of blades	ZI =15full+15splitter
Exit diameter	D2 = 431.44 mm
Back sweep angle	β =50 deg
Exit tip speed	U2 = 492 m/s
Radial diffuser
Number of vanes	ZD =24
Inlet/outlet radius ratio	R3/R4 = 0.641
Inlet metal angle	α =12 deg