Method for quickly determining surge of air compressor

Abstract

The invention belongs to the field of anti-surge early-warning control of aero-engine air compressors, and is directly used for quickly determining a state of a surge occurred in the air compressor intests of whole engine and components of the aero-engine. A method for quickly determining the surge of the air compressor adopts a dynamic pressure probe, a dynamic pressure sensor, a dynamic data acquisition system, a processing and analysis program and a computer, wherein the dynamic pressure probe is installed at an outlet of an air compressor of an aero-engine, and is used for measuring dynamic pressure in a flow channel of the air compressor; a dynamic pressure signal is transmitted to the dynamic pressure sensor by means of the dynamic pressure probe; the dynamic pressure sensor sensesthe dynamic pressure signal, converts the dynamic pressure signal into an electric signal, and transmits the electric signal to the dynamic data acquisition system by means of a built-in converter; the dynamic data acquisition system processes the dynamic pressure signal into a frequency domain signal and inputs the frequency domain signal into the processing and analysis program; the processing and analysis program analyzes and compares sudden change situations of different band amplitude values, determines the occurrence of the surge; and the surge is reflected by means of the computer finally.

Description

technical field [0001] The invention belongs to the field of anti-surge early-warning control of air compressors, in particular to a method for quickly judging the air compressor surge, which can be directly used to quickly determine the state of air compressor surge in the test of the complete machine and parts of the aero-engine. Background technique [0002] The commonly used detection and early warning method for aero-engine compressors is a dynamic pressure probe installed at the outlet of the compressor, which transmits the surge signal to the dynamic pressure sensor through a pressure lumen with an inner diameter of Φ4mm, and the sensor converts the dynamic pressure signal into The voltage signal is transmitted to the data acquisition system, and the data acquisition system processes the voltage signal into a time domain signal and a frequency domain signal, and determines the occurrence of aeroengine compressor surge through the anti-surge control program set in the c...

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Problems solved by technology

[0003] The disadvantage of this method is that the response speed is relatively slow. The anti-surge test system installed at the outlet of the compressor judges that the compressor has surged through the sudden drop in the average value of the pressure and the sudden increase in the amplitude of the low-frequency surge signal. At the moment when the first compressor surges, at this time, the surge judgment test system has gone through a period of time from the judgment to the implementation of the surge relief device, and the surge has already caused the occurrence of forced vibration, which will cause serious damage to the compressor and engine. It not only causes the engine to stop suddenly, but also causes the compressor blades to vibrate violently, causing the blades to break and cause damage to the entire engine.

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