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Dynamic Model for the Simulation of Surge in a Centrifugal Compression System with Vaned Diffuser
Author(s) -
Zhiheng Wang,
Pengfei Zhang,
Guang Xi,
Yang Zhao
Publication year - 2019
Publication title -
proceedings
Language(s) - English
Resource type - Conference proceedings
ISSN - 2504-4400
DOI - 10.33737/gpps19-bj-156
Subject(s) - centrifugal compressor , instability , piping , surge , gas compressor , mechanics , diffuser (optics) , flow (mathematics) , pipeline (software) , control theory (sociology) , engineering , computer science , physics , mechanical engineering , electrical engineering , light source , optics , control (management) , artificial intelligence
As the flow rate decreases from stable point to surge point, the flow phenomenon of low-frequency system dependent pulsation occurs in a centrifugal compressor compression system. In order to predict the system instability of surge with higher accuracy, the mathematical model of pipeline coupled with the model of lumped parameters is used to investigate the effect of pipeline on the system instability of a centrifugal compressor. The predicted vibration frequency of mild surge matches well with the measured data and the relative error is just 2.3%. And also, the spatial distribution of gas fluctuation in pipeline is analysed in detail to elucidate the developing characteristics of system instability affected by the piping system. Moreover, with the analysis of system instability under varied parameters of pipeline, each parameter has a different influence on the stability and vibration frequency. This study confirms that this model is a useful tool to give a detailed analysis about the effect of pipeline on system instability.

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