Title: Dynamic simulation of centrifugal compressor system based on the semi-mechanism modelling

Authors: Xuejiang Chen; Zhijie Jia; Yang Su; Mingshun Yan

Addresses: Institute of Fluid Machinery and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China ' Institute of Fluid Machinery and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China ' Institute of Fluid Machinery and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China ' Institute of Fluid Machinery and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China

Abstract: There are many transient changes in the operation of the centrifugal compressor system, so it is very important to study the dynamic characteristics of the centrifugal compressor system. In this study, a semi-mechanism dynamic simulation method based on the Greitzer model is proposed to study the dynamic characteristics of centrifugal compressor systems. The steady-state performance curves of the compressor and valve are obtained through CFD simulation. Using the established simulation model in MATLAB/Simulink, the dynamic characteristics of the compressor system's outlet pressure under typical working conditions were analysed. Furthermore, typical surge phenomena are simulated, revealing a main vibration frequency of approximately 4 Hz in the inlet pressure, outlet pressure, and mass flow rate. This semi-mechanism simulation model demonstrates high reliability and can replace complex transient testing processes, offering a novel approach to studying the dynamic characteristics of centrifugal compressor systems.

Keywords: compressor; dynamic modelling; CFD; compressor surge.

DOI: 10.1504/PCFD.2025.147794

Progress in Computational Fluid Dynamics, An International Journal, 2025 Vol.25 No.4, pp.189 - 200

Received: 20 Apr 2024
Accepted: 19 Oct 2024
Published online: 01 Aug 2025 *

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