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The occurrence of vibration phenomenon depends on the characteristic curve of the pipe network and the characteristic curve of the centrifugal compressor. The reason for the formation of surge is the periodic alternation of reverse flow and air supply. The centrifugal compressor is connected to the pipeline network to form a closed gas medium transportation system. The compressor and the pipeline network work in this system at the same time, providing the necessary conditions for the transportation and pressure increase of the gas medium. If the flow rate of the compressor is constant during the transportation of the gas medium, Reduce When the compressor inlet flow rate is reduced to a certain value, the gas first generates a separated vortex flow in the impeller flow channel, further reducing the gas separation vortex area in the impeller flow channel and further expanding and forming a serious rotational detachment phenomenon. The gas flow state is seriously deteriorated and the compressor is discharged. When the pressure drops significantly, the pipe network gas will flow back to the compressor until the compressor outlet pressure is greater than the pipe network compressor and begins to discharge gas again. This periodic oscillation phenomenon produced by the air flow in the system is commonly known as compressor surge. That is to say, when the compressor flow rate is small enough, severe rotational stall will occur in the entire diffuser flow channel, and the compressor outlet pressure suddenly drops, making the pressure of the pipe network higher than the compressor outlet pressure, forcing the air flow to flow back. compressor until the pipe network pressure drops below the compressor outlet pressure, the compressor starts to supply air to the pipe network again, and the compressor returns to normal. When the pressure in the pipe network returns to its original pressure, the flow rate is still less than the surge flow rate, and the compressor develops a severe rotational stall, the outlet pressure drops, and the air flow in the pipe network flows back to the compressor. Repeatedly, the flow rate and outlet pressure of the compressor fluctuate greatly periodically, causing strong air flow fluctuations in the compressor. This phenomenon is called compressor surge. Generally, if the pipeline network capacity is large, the surge amplitude will be large and the frequency will be low. On the contrary, if the pipeline network capacity is small, the surge amplitude will be small and the frequency will be high. The harm of surge phenomenon in centrifugal compressors The surge phenomenon of centrifugal compressors is extremely harmful to the compressor, which is mainly manifested in the following aspects: ① During surge, due to the strong pulsation and periodic oscillation of the air flow, the air supply will The parameters
power and flow rate fluctuate with varying amplitudes, destroying the stability of the process system.
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