Stall Margin Improvement in a Centrifugal Compressor through Inducer Casing Treatment
Table 2
Geometry details of casing treatment configurations.
S. number
Parameter
Geometric details
1
Number of slots
76 (4 slots per blade passage)
2
Slot thickness
3.9 mm
3
Gap between two adjacent slots
2.7 mm
4
Slot profile in radial direction
Linearly extended in spanwise direction of impeller blade
5
Slot radial depth
20 mm (25% of leading edge blade height)
6
Slot profile in streamwise direction
Following the impeller blade angle distribution at inducer tip section from leading edge Extending linearly in upstream direction from leading edge of inducer at an angle equal to the inducer leading edge angle
7
Slot extension downstream of the inducer leading edge (over impeller blade tip)
30% of impeller blade chord at shroud
8
Slot extension upstream of inducer leading edge
CT-1: 20 mm CT-2: 20 mm CT-3: 40 mm
Note: CT-1 and CT-2 differ in slot leading edge geometry
