Table 3 Stall onset improvement of natural aspiration case in comparison to untreated case for various blades tip clearances.

From: Enhancement of aerodynamic performance of axial compressors utilizing natural aspiration through optimized casing circumferential slot

Blades tip clearance (%)

Stall onset improvement (\(\overline{\Delta \varphi }\))

Blade tip clearance mass flow rate (g/s)

Plane case

Optimized aspiration case

0.8

2.7 %

3.7

3.8

1.7

3.0 %

7.5

7.7

2.6

3.9 %

12.1

12.3

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