Abstract Unsteady aerodynamic phenomena appearing close to the stall boundary in axial fans and compressors have been subject of extensive investigations. A particular phenomenon known as “rotating instabilities” typically occurs tip region at highly loaded conditions is often linked blade vibrations. During rig engine testing, it usually identified by characteristic shape its pressure spectra....

Abstract Casing treatments are used to extend the stability margin of fans or compressors. These typically have an axisymmetric arrangement, but for a fan exposed non-axisymmetric distortion, casing treatment applied fraction annulus is interest target particular distortion feature. In this paper, partial has been designed with axial-skewed slots, and experimental investigation carried out dete...