Stall Margin Improvement in a Centrifugal Compressor through Inducer Casing Treatment

Table 1

Design specification of centrifugal impeller.

Parameter	Value
Total pressure ratio	4 : 1
Rotational speed	30,000 rpm
Corrected mass flow rate	2 kg/s
Isentropic efficiency	90%
Number of impeller blades	19
Inducer tip diameter	160 mm
Inducer hub diameter	80 mm
Impeller tip diameter	300 mm
Impeller blade width at tip	6.94 mm
Impeller blade tip clearance	0.5 mm
Impeller back sweep angle	30 degrees (from radial direction)