Apparatus and method for diagnosing and controlling aerodynamic stability of compressor

A method for diagnosing and controlling stability of a compressor having a casing, comprising:

• measuring one or more fluctuation signals of an airflow at one or more positions inside the compressor in real time with a sensor of an apparatus, and transmitting one or more real-time measurement signals obtained at the one or more different positions to a signal processor, wherein the apparatus comprises the sensor, the signal processor and a controller;
• determining, according to the one or more real-time measurement signals, a type and a spatial distribution of an instability precursor of the compressor in operation with the signal processor, and outputting one or more control strategy signals to the controller;
• performing one or more corresponding control actions according to one or more received outputs of the one or more control strategy signals with the controller to regulate the stability of the compressor,
• wherein the measuring one or more fluctuation signals of an airflow at one or more positions comprises measuring the pressure or velocity fluctuation of the airflow at the different positions, and the pressure or velocity fluctuation of the airflow at the different positions comprises:
• a first pressure fluctuation or a first velocity fluctuation at an inlet duct of a rotor blade passage between rotor blades and at an outlet duct of a stator blade passage between stator blades in the compressor;
• a second pressure fluctuation or a second velocity fluctuation at an outlet duct of the rotor blade passage and at an inlet duct of the stator blade passage;
• a third pressure fluctuation between a rotor blade tip and a casing wall of the casing;
• a fourth pressure fluctuation at a blade surface of a stator blade;
• a fifth pressure fluctuation or a fifth velocity fluctuation inside the rotor blade passage;
• and
• a sixth pressure fluctuation or a sixth velocity fluctuation inside the stator blade passage,
• wherein the sensor comprises a contact sensor and a non-contact sensor, and wherein the contact sensor comprises a dynamic pressure sensor and a dynamic probe,
• the dynamic pressure sensor is arranged on the casing wall in the compressor corresponding to a blade tip of a rotor blade, to measure a pressure fluctuation of the airflow at the rotor blade tip in the compressor in real time, and
• the dynamic probe is arranged inside inlet and outlet ducts to measure the pressure or velocity fluctuation of the airflow in the inlet and outlet ducts of the rotor and stator blade passages in real time, and
• wherein the non-contact sensor is located outside the compressor and spaced a distance from the compressor, and the non-contact sensor comprises an optical measuring instrument,
• the casing is a transparent casing, and the airflow in the compressor is added with reflective particles, and
• wherein the optical measuring instrument is configured to emit a laser light and receive a light signal reflected by the reflective particles in the airflow in the compressor, so as to measure in real time pressure or velocity fluctuations of the airflow inside the rotor and stator blade passages.