Experimental and Numerical Investigations of Surge Extension on a Centrifugal Compressor with Vaned Diffuser Using Steam Injection

Table 1

Typical design parameters.

Total pressure ratio	—	3.55
Designed mass flow rate	kg/s	3.2
Impeller tip speed	m/s	433
Blade number	—	16 + 16
Impeller tip radius	m	0.115
Average blade exit angle	Deg	90
Impeller blade inlet angle	Deg	52
(dimensionless)	—	0.83
Diffuser inlet angle	Deg	1.6
Diffuser vane number	—	23
Diffuser area ratio	—	2.1