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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2013, Vol. 34 ›› Issue (8): 1786-1794.doi: 10.7527/S1000-6893.2013.0316

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Research on Electrostatic Sensing for In-line Abrasive Monitoring in Full Flow Oil System

HUANG Wenjie1,2, ZUO Hongfu1   

  1. 1. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. College of Transportation, Huaiyin Institute of Technology, Huai'an 223003, China
  • Received:2012-10-15 Revised:2012-12-25 Online:2013-08-25 Published:2013-01-05
  • Supported by:

    Grant from National Natural Science Foundation of China and Civil Aviation Administration of China(60939003)

Abstract:

In view of the absence of a mathematical model consistent with the physical model and of an in-depth analysis in the research on in-line abrasive electrostatic monitoring in the full flow oil system of an aero-engine, this paper proposes a mathematically more precise model. An analysis of the signal acquisition circuit indicates that the output of the induced voltage varies with the debris which carries different electric charges while passing through the electrostatic sensing area, and the polarity of the charge carried is ascertained consequently. Meanwhile, a study is conducted of the three factors influencing the spatial sensitivity: the position of the charged abrasive, the axial length and the radial radius of the transducer. The curves of spatial sensitivity obtained show good agreement, which demonstrates that the mathematical model is built accurately. To prove the consistency of the mathematical model with the data acquired during the abrasive monitoring process in the actual full flow oil system, an imitative monitoring platform is designed and the experimental result showes that the monitored signal induced by the electrostatic system is similar to the voltage output in the theoretical analysis and the abrasive polarity can be judged as well, though the signal is coupled with noise.

Key words: aero-engine, oil system, in-line monitoring, mathematical model, spatial sensitivity

CLC Number: