Estimation of the Aerodynamic Force Induced by Vaneless Diffuser Rotating Stall in Centrifugal Compressor Stages

Submitted by admin on Fri, 05/13/2016 - 17:07
TitleEstimation of the Aerodynamic Force Induced by Vaneless Diffuser Rotating Stall in Centrifugal Compressor Stages
Publication TypeConference Proceedings
Year of Publication2016
AuthorsMarconcini M, Bianchini A, Checcucci M, Biliotti D, Giachi M, Rubino D T, Arnone A, Ferrari L, Ferrara G
Conference NameATI 2016 - 71st Conference of the Italian Thermal Machines Engineering Association
VolumeEnergy Procedia 101
Pagination734-741
Conference LocationTurin, Italy, 14-16 September 2016
ISSN Number1876-6102
Accession NumberWOS:000398030000093
Other NumbersScopus 2-s2.0-85010822036
Keywordscentrifugal compressor, CFD, radial force, rotating stall, vaneless diffuser
Abstract
Rotating stall in centrifugal compressors not only adversely affects the performance before surge, but also can generate high subsynchronous vibrations, marking the minimum flow limit of a machine. Recent works presented an experimental approach to estimate the stall force induced by the unbalanced pressure field in a vaneless diffuser from dynamic pressure measurements. In this study, the results of a 3D-unsteady simulation of a radial stage model were used to estimate the stall force and to compare it with the approximation obtained with an “experimental-like” approach. Results showed that: a) the experimental approach, using dynamic pressure sensors and an ensemble average approach for transposing data between time and space domains, is thought to give sufficiently accurate results; b) the momentum contribution gives negligible contributions to the intensity of the stall force.
URLhttp://www.sciencedirect.com/science/article/pii/S1876610216313029
DOI10.1016/j.egypro.2016.11.093
Refereed DesignationRefereed