Numerical study on the influence of shroud cavity in the high-pressure centrifugal compressor for compressed air energy storage system

Abstract As a key energy equipment of the compressed air storage (CAES) system, centrifugal compressor with shroud cavity is employed to avoid leakage flow from rotor, especially in high-pressure stages. In order clarify characteristics and its influences, taken as research object present work. First, across has been studied numerically, it’s found that there are negative effects on compressor’s aerodynamic performance by cavity. And then, inside showed finding several secondary regions vortices. addition, through entropy contours streamlines, influence main analysed detail. By analysing compressor, this paper can provide practical guidance for design impeller CAES system.