METHOD FOR DETERMINING THE AMOUNT OF JET ENGINE VELOCITY CURRENT OF ELECTRICALLY CHARGED PARTICLES IN THE EXHAUST STREAM OF AN AIRCRAFT GAS TURBINE ENGINE BLAST IN FLIGHT Russian patent published in 2021 - IPC G01N27/00 G01R29/24 G01M15/14 

FIELD: measurement.

SUBSTANCE: invention relates to investigation of properties of substances, namely to determination of current of electrically charged particles in exhaust jet of aircraft gas turbine engine (GTE) in flight. Summary: based on calculation of electric charge carrying current in GTE exhaust jet in flight, measurement data are taken on takeoff mode of corona current from current collectors of chassis and one of electrostatic dischargers of aircraft. Method for determining the amount of electric current of carry-over of electrically charged particles in GTE exhaust jet in flight provides for measurement in clear meteorological conditions of currents of corona discharges from elements of aircraft structure - electrostatic dischargers and determination of value of carryover current. At that, testbed aircraft (TA) is used to test GTE. Current collectors are equipped with chassis current collectors to measure corona discharge currents. Takeoff of TA is performed at engine mode providing maximum carryover current. After separation from runway in range of altitudes of about 0-30 m, currents of corona discharges appearing at current collectors of chassis are measured. Maximum current values are selected for each current collector, and the carryover current with opposite polarity is determined by total current sum from current collectors. As the flight altitude is set, when current reaches the current-carrying chassis of chassis of zero values, current is measured on one of the electrostatic dischargers of the aircraft until the steady-state value is achieved by this current. Then, the fraction of the carryover current measured at the landing gear current collectors is determined. Maximum carryover current at any of various flight modes and under different weather conditions is determined based on the obtained portion of the carryover current at the discharger and current measured in specific modes and meteorological conditions at the current discharger. Obtained values of the maximum carryover current are used to determine the level of engine smoke, to develop a system for electrostatic protection of aircraft radio receiving equipment, and by checking the dependence of the carryover current on the number of revolutions of the tested engine from the calibrated curve, the engine is faultless.

EFFECT: higher accuracy of measuring motor current, simplified procedure of aircraft equipment.

1 cl