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

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• 作者：Michele Marconcini^a ; Alessandro Bianchini^a ; Matteo Checcucci^a ; Davide Biliotti^b ; Marco Giachi^b ; Dante Tommaso Rubino^b ; Andrea Arnone^a ; Lorenzo Ferrari^c ; ^{lorenzo.ferrari@iccom.cnr.it} ; Giovanni Ferrara^a
• 关键词：centrifugal compressor ; CFD ; rotating stall ; experimental analysis ; stall force
• 刊名：Energy Procedia
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：101
• 期：Complete
• 页码：734-741
• 全文大小：1435 K
• 卷排序：101

文摘

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.