The invention discloses an axial flow
compressor stall surge prediction device based on
frequency characteristic change. An inlet
dynamic pressure / flow sensor is mounted at an inlet casing wall of a compressor, an outlet
dynamic pressure / flow sensor is mounted on the periphery of an outlet casing wall of the compressor, the inlet
dynamic pressure / flow sensor and the outlet dynamics / flow
pressure sensor are correspondingly connected with a
signal acquisition card at the same time, the
signal acquisition card is connected with a single-
chip microcomputer established with a spectrum characteristic
database, a
noise energy ratio threshold valve is arranged in the spectrum characteristic
database, and the single-
chip microcomputer is connected with a controller conducting the surge early warning when the
radiation noise energy ratio of the outlet end of the compressor reaches a set
noise energy ratio threshold valve. By establishing the spectrum characteristic
database, the pressure fluctuation frequency change in a working process of detecting and monitoring the compressor in real time, the
frequency spectrum characteristics of the inlet air pressure and the outlet air pressure can becompared, the early warning is effectively conducted on the occurring of the surge before the surge occurs, and the reliability is high.