The Theory of an Electrostatic Metal-Particle Sensor Operating in a Jet Engine Exhaust.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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An electrostatic probe is studied as a charged metal particle detector in a jet engine exhaust from both a theoretical and experimental standpoint. The theoretical development concentrated on the electrostatic particle-probe interaction problem. The mechanism by which a moving charged particle induces a voltage pulse in a probe sensing circuit is studied and a practical model for the particle-probe system is developed and the resulting voltage pulses are explained by means of a capacitive equivalent electrical circuit. In order to predict the voltage pulse waveform, the changing capacitance between a moving charged particle and an electrostatic probe is determined, and the predicted voltage pulse is found to depend upon the particle charge and the probe sensing circuit. The interaction of an uncharged particle with a biased probe and the jet engine exhaust plasma effects are briefly discussed. Modified author abstract
- Test Facilities, Equipment and Methods
- Combustion and Ignition
- Jet and Gas Turbine Engines