A kind of electrostatic sensor with specific size was designed and assembled on exhaust nozzle in wall of turbofan engine nearby the low pressure turbine

and the civil turbofan engine was served as electrostatic sensor carrier and monitoring object in exhaust electrostatic monitoring experiment. The whole performance test process was taken as test period

and exhaust electrostatic signal was fully acquired during the test period. Data processing and contrastive analysis of electrostatic signal data and aero-engine performance parameters were taken

meanwhile the activity level(AL) and negative event rate (NER) of abnormal signal in the test period were calculated

and reason of the abnormity was analyzed. This experiment verified the feasibility of airborne installing for electrostatic monitoring technology. Results show that

the electrostatic signal is about 5mV in normal condition

electrostatic level changes with the operating power and has an obvious positive correlation trend; electrostatic sensor has great effects on monitoring abnormal particle in exhaust

the AL and NER can reach 14pC and 8% in fuel-rich combustion condition.