The Proceedings of the Fluids engineering conference
Online ISSN : 2424-2896
2015
Session ID : 1615
Conference information
1615 The Effects of Impeller Tip Clearance on Internal Flow Characteristics in a Centrifugal Compressor
Miku KURODASota IKEZUNobumichi FUJISAWAYutaka OHTA
Author information
CONFERENCE PROCEEDINGS FREE ACCESS

Details
Abstract
The CFD analysis was conducted to investigate the effect of impeller tip clearance on internal flow in a centrifugal compressor with vaned diffuser. In previous studies, the leading-edge vortex (LEV) was produced near the diffuser leading-edge and the growth of the LEV deteriorated compressor performance. In addition, the LEV was enlarged by the tip-leakage vortex. In case of using impeller without clearance, corner vortex produced on pressure side of the impeller plays a similar role to tip-leakage vortex. Furthermore, the LEV develops and forms a huge flow blockage within diffuser passages at off-design operation, considering impeller tip clearance. However, the flow fields in diffuser passages were stable because the LEV was stationary on the suction side of the diffuser leading-edge in analysis of using impeller without tip clearance. Therefore, the tip-leakage vortex was considered to be the cause of diffuser stall at off-design operation.
Content from these authors
© 2015 The Japan Society of Mechanical Engineers
Previous article Next article
feedback
Top