To seek the incipient symptom of surge in the centrifugal compressor
the frequency-domain characteristics of the pressure signal from the state far from surge to the state of full developed surge are analyzed by correlation integral method combining with zoom fast Fourier transform
and a new surge early warning method defining a parameter related with the frequency band energy as the measure is proposed according to the fact that the perturbed energy increases nonlinearly during the surge process. It is illustrated that the frequency band energy of surge is endowed with a visible increase process
and the time delay of 1 - 2 s between the initial rise and the full onset of surge is long enough to allow the effective response of the controller. The investigation offers a powerful support for the compressor to operate under safe and high-efficient condition.
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