Aerodynamic instabilities detection via empirical mode decomposition in centrifugal compressors

Detection of aerodynamic instabilities in compressors is great importance for machine safety and efficiency. It a challenge due to their highly non-stationary non-linear character. In this study, method instability detection centrifugal compressor employing empirical mode decomposition (EMD) proposed. The has proven work well isolating highlighting features from non-stationary, noisy pressure signals. Two Instability Features (IDFs) based on energy selected intrinsic functions (IMFs) were defined inlet recirculation (IDF-IR) surge (IDF-S). level classification offered by the proposed method. first allows differentiate stable unstable working conditions. second distinguishes between two types flow instability: local – global surge. was evaluated using short, high-frequency signals collected known operating Accuracy reached 100%, while 99% accurate. EMD-based traceable connection with physics flow, thus it fully explainable should perform similarly different machines measurement systems if appropriate IMFs are employed.