Research On On-Line Monitoring Method Of Aeroengine Air Path Debris

A real-time online monitoring technique is the electrostatic monitoring of the gas path.The early fault and performance deterioration of the engine are detected,and the early alert information is sent,by monitoring the change of the overall electrostatic charge level in the engine airflow route.This technology is widely used as a new type of engine on-line monitoring method because of its strong robustness,high reliability,and excellent real-time performance.In order to further enhance the application of electrostatic monitoring technology in engine condition monitoring,the charged debris in the gas path is chosen as the study object in this paper,and the electrostatic monitoring technology is introduced to monitor it online.The following are the particular research contents:(1)Based on the theory of electrostatic monitoring technology in gas path,the formation mechanism of typical abnormal charged debris in gas path is analyzed in detail,and the principle of electrostatic monitoring technology is studied.On this basis,the influencing factors of the amount of induced charge on the sensor probe are explored.(2)Based on the analysis of the principle of electrostatic sensor,according to the performance requirements and working environment characteristics of each component of the sensor,the material selection and structural design of the electrostatic sensor are explored,and the electrostatic sensor suitable for the engine gas path environment is developed.(3)The gas-solid-electric coupling simulation analysis model is established,and the distribution of electric field in the engine nozzle is obtained,which provides guidance for the installation layout design of the sensor.(4)On the basis of correlation coefficient analysis,a technique for extracting electrostatic signal feature parameters is suggested.The correlation calculation of the characteristic parameters is carried out in order to address the issue that it is challenging to select the characteristic parameters that best describe the electrostatic signal.The location of the stator and rotor fault is realized using a positioning technique for engine rubbing fault that is proposed.(5)To test the dependability of the electrostatic sensor design in various working settings,a number of experimental platforms were built to conduct engine fault simulation studies and genuine engine ground bench investigations.The sensor can operate normally at temperatures reach 1000℃ in an engine ground bench test and1200℃ in an off-line situation,demonstrating the logic of the electrostatic sensor’s design.