METHOD FOR DETERMINING THE VALUE OF SUPPLIED ELECTROSTATIC STRESS TO THE PAYOFF NEEDLE IN A NEEDLE-NEEDLE ELECTRODE SYSTEM IN A CLOSED VOLUME WITH LIQUID HYDROCARBON FUEL (COOLANT) Russian patent published in 2022 - IPC G09B23/18 G01R29/12 

FIELD: measuring.

SUBSTANCE: invention relates to the field of research of electrostatic fields in liquid hydrocarbon fuels (coolants) and any mixtures thereof and is intended for determining the value of supplied high-voltage electrostatic stress to the payoff working coaxial needle in a needle-needle electrode system. Substance: the value of supplied high-voltage electrostatic stress to the payoff working coaxial needle in a needle-needle electrode system with the diameters 1.2 to 3.0 mm and the tip angles 15 to 85° is determined in a closed volume of an experimental bomb with visualisation windows, using a Toepler optical system under conditions of natural convection at subcritical, critical, and supercritical pressures and with temperatures within (273 to 333) K. Herewith, the hydrodynamic effect of electric wind is visualised on the screen by measuring the diameter of spherical hydraulic swirls of the hydraulic flare formed by the hydrodynamic effect of the electric wind, followed by scaling. The diameter of hydraulic swirls is measured on the screen during the operation of the experimental system or in Toepler photographs after the operation of the experimental system. The scaling is based on the known diameter of the coaxial working needles, measured prior to operation of the experimental system. The value of the required stress is determined based on the experimental reference graph of the dependence of stress on the diameter of spherical hydraulic swirls.

EFFECT: creation of a probe-free method for determining the value of supplied high-voltage electrostatic stress to the payoff needle in a needle-needle electrode system in a closed volume with liquid hydrocarbon fuel (coolant) or with a mixture of liquid hydrocarbon fuels (coolants) under conditions of natural convection at subcritical, critical, and supercritical pressures for the purpose of quickly finding the value of supplied high-voltage electrostatic stress in earth and space conditions.

9 cl, 2 dwg, 1 tbl