1990•Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and EnergyRequires access

Effect of Casing Treatment on Aerodynamic Performance of a Contrarotating Axial Compressor Stage

D.S. Pundhir, P. B. Sharma, Kshitij Chaudhary

Abstract

The paper reports the results of an experimental investigation on the effect of casing treatment on aerodynamic performance of a low-speed contrarotating axial compressor stage having a hub-tip ratio of 0.667. Three types of casing treatments, namely axial slots, axial skewed slots and circumferential grooves, have been examined. Flow structure downstream of the rotors is examined for treated casing and compared with solid casing. The results show a significant improvement in stall margin and efficiency during off-design operation of a contra stage.

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Key concepts: Casing, Axial compressor, Aerodynamics, Gas compressor, Stall (fluid mechanics), Stage (stratigraphy), Materials science, Structural engineering