Broadening apparatus and method, and stable operation of the centrifugal compressor centrifugal compressor region

The invention discloses a device for widening a stable operation area of a centrifugal compressor. The device comprises a plurality of high frequency response dynamic pressure sensors, a high frequency response dynamic strain indicator, signal conditioning equipment, a signal processing digital signal processor (DSP) module, and an air jet device, wherein the dynamic pressure sensors and the dynamic strain indicator acquire dynamic signals of the compressor during operation; the signal conditioning equipment transmits the signals to the DSP module; and the DSP module processes the signals and sends a command to a controller so as to make the air jet device act. The device can widen the stable operation area of the centrifugal compressor, namely a stability working range, and eliminates or reduces the harm of flow instability, namely stall and surge. The invention also discloses a method for widening the stable operation area of the centrifugal compressor, and a centrifugal compressor provided with the device for widening the stable operation area of the centrifugal compressor.