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 using 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 an ensemble average approach for transposing data between time and space domains provides sufficiently accurate results; b) the momentum contribution, neglected in experiments, gives negligible contribution to the final intensity of the stall force.
Estimation of the Aerodynamic Force Induced by Vaneless Diffuser Rotating Stall in Centrifugal Compressor Stages / Marconcini, Michele; Bianchini, Alessandro; Checcucci, Matteo; Biliotti, Davide; Giachi, Marco; Rubino, Dante Tommaso; Arnone, Andrea; Ferrari, Lorenzo; Ferrara, Giovanni. - In: ENERGY PROCEDIA. - ISSN 1876-6102. - ELETTRONICO. - 101:(2016), pp. 734-741. (Intervento presentato al convegno ATI 2016 - 71st Conference of the Italian Thermal Machines Engineering Association tenutosi a Turin, Italy nel 14-16 September 2016) [10.1016/j.egypro.2016.11.093].
Estimation of the Aerodynamic Force Induced by Vaneless Diffuser Rotating Stall in Centrifugal Compressor Stages
MARCONCINI, MICHELE;BIANCHINI, ALESSANDRO;CHECCUCCI, MATTEO;ARNONE, ANDREA;FERRARA, GIOVANNI
2016
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 using 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 an ensemble average approach for transposing data between time and space domains provides sufficiently accurate results; b) the momentum contribution, neglected in experiments, gives negligible contribution to the final intensity of the stall force.File | Dimensione | Formato | |
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