What is surge, and what are its hazards?

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Surge is a type of abnormal vibration that occurs in turbine compressors (also known as vane compressors) when the flow rate decreases to a certain level. A centrifugal compressor is a type of turbine compressor, and surge poses a serious threat to centrifugal compressors. 　　When a centrifugal compressor experiences surge, typical phenomena include: 1) the outlet pressure of the compressor first increases, then drops sharply, exhibiting periodic and significant fluctuations ； 2) The compressor’s flow rate drops sharply and fluctuates significantly; in severe cases, air even reverses flow back into the suction pipeline ； 3) The current and power meter readings of the compressor motor become unstable, with significant fluctuations ； 4) The machine experiences severe vibration, along with abnormal airflow noise. 　　Currently, there are three common methods to address surge: ① Adding bleed valves to the compressor to allow excess gas to be discharged. ②Use a twin-rotor or triple-rotor compressor. ③Use adjustable blades. 　　In a system in which a centrifugal compressor operates in conjunction with pipelines, when the flow rate drops to a certain minimum value, periodic airflow oscillations occur within the system due to severe flow separation in the compressor’s flow channels, as well as the fact that the intersection point of the pipeline’s performance curve and the compressor’s performance curve lies within the surge limit line. The larger the capacity of the pipeline, the greater the amplitude and the lower the frequency of surge. The smaller the capacity of the pipeline, the smaller the amplitude and the higher the frequency of surge. Surge phenomenon is extremely harmful; it can lead to increased noise, blade damage, unit vibration, and bearing damage, ultimately resulting in serious accidents. Hehe, information found on Baidu!