The results of experimental studies and numerical calculations of the parameters of an electric discharge with a liquid (nonmetallic) cathode in air flow at atmospheric pressure are presented. The shapes of plasma structures arising in the interelectrode gap are described. The plasma composition and electron concentration are determined by optical emission spectroscopy, and the temperature of the surface of the electrodes in the discharge burning zone is determined by the infrared thermography method. The current–voltage characteristic (CVC) of the discharge is plotted. The results of numerical calculations of the distributions of the power density of the Joule heat release and the electric field strength near the metal anode are presented. The formation of a vapor–liquid mixture around the part of the metal anode immersed in the electrolyte is described.

The results of an experimental study of an alternating current discharge with a frequency of 50 Hz in a gas-liquid medium of a 1

The results of experimental studies of the electric discharge of alternating current (f = 50 Hz) in a gas–liquid environment of an electrolyte with bubbles for interelectrode distances of 50–150 mm inside a dielectric tube are presented. The presence of a bubble structure with microdischarges affects the nature of the discharge current and voltage ripples. The frequency spectrum of voltage and current oscillations of the discharge is established using the fast Fourier transform. Based on the analysis of the experimental data, the mechanism for the development of an alternating current electric discharge in a medium with microbubbles is established.

Представлены результаты экспериментальных исследований и численных расчетов параметров электрического разряда с жидким (неметаллическим) катодом в потоке воздуха атмосферного давления. Описаны формы плазменных структур, возникающих в межэлектродном промежутке. С помощью оптической эмиссионной спектроскопии установлены состав плазмы и концентрация электронов. Методом инфракрасной термографии определена температура поверхности электродов в зоне горения разряда. Построена вольт-амперная характеристика разряда. Приведены результаты численных расчетов распределения плотности мощности джоулевого тепловыделения и напряженности электрического поля вблизи металлического анода. Описано образование парожидкостной смеси вокруг погруженной части металлического анода в электролит.

A high-frequency discharge ( f = 13.56 MHz) generated between jet electrolytic (3% solution of ammonium sulfate in purified water) and metal (copper plates of the M1 grade) electrodes in the pressure range of p = 105–3 × 104 Pa is studied. The ignition of the high-frequency (HF) discharge was carried out by applying an electrolyte jet to the surface of a copper plate in the discharge chamber. The types and shapes of plasma structures generated in the interelectrode gap and their mutual transformations at the change in the voltage are considered. Hydrogasdynamic processes in the combustion zone of the HF discharge are described, including optically inhomogeneous gas flows, disturbances of the jet electrode, and the formation of droplets. The thermograms of the surface of the jet and metal electrodes under the conditions of the HF discharge combustion are considered. The composition of the plasma, the electron density, and the temperature of the heavy component are studied using emission spectroscopy.

The results of an experimental study of an alternating current discharge with a frequency of 50 Hz in a gas-liquid medium of a 1% of NaCl solution in distilled water with air bubbles and microdischarges inside a dielectric tube with a diameter of 10 mm at reduced pressures for various interelectrode distances of copper electrodes—50, 100, and 150 mm—are presented. A qualitative mechanism for the development of a breakdown and discharge at low pressures in a gas-liquid medium is established. It is found that with a decrease in pressure, a gas-liquid medium is formed, saturated with small air bubbles ranging in size from 1 to 3 mm as a result of boiling and electrolysis. This, in turn, leads to a breakdown and rapid discharge ignition in a porous medium near a solid electrode. The transition of an electric discharge with microdischarges to a volumetric discharge at low pressures is established. A fast Fourier transform was carried out, and the discharge voltage and current spectra were determined at reduced pressures.

The results of experimental studies of an electric discharge and a low-power dielectric barrier discharge between metallic and electrolytic electrodes at low frequencies of 20, 33, and 100 Hz are presented. The burning of a low-voltage anomalous discharge of alternating current at atmospheric pressure with an increasing volt-ampere characteristic was recorded. Images of the discharge and current-voltage characteristics of electric and dielectric barrier discharges with metallic (pin and plate) and liquid (industrial water) electrodes are presented. Features of the burning of electric and dielectric barrier discharges of low-frequency current with liquid electrodes and metallic electrodes of various shapes are revealed.

We present the experimental results on thermograms and plots of temperature distributions along the streamer and spark discharges in a high-frequency capacitive field between solid and liquid electrodes for different electrode geometries.

Experimental results are presented on transition of a streamer shape multichannel discharge into a multichannel spark discharge. We present current–voltage characteristics of a multichannel streamer discharge at atmospheric and reduced pressures as well as temperature distribution between a plate-like copper electrode and technical water.

We present the results of a DC electric discharge experimental study between a jet anode and copper cathode at atmospheric pressure. We found the essential influence of the jet anode flow nonuniform character on the discharge development for different power supply regimes. Discharge burning peculiarities are revealed in the jet regime at different power supply voltages with small fluctuation in the milli-, micro-, and nanosecond ranges of the time sweep. We also determined temperatures at the copper cathode surface and its atomization. By means of the Fourier transformation, we reveal the frequency spectrum of the discharge current oscillations.

Within this work results of researches of electric discharge with liquid nonmetallic electrodes are presented. Features of formation of electric discharge depending on structure and concentration of electrolyte, electrophysical processes are described, the volt-ampere characteristic of the category is constructed. Distribution of electric field strength along an electrolyte stream is presented.

We present the results of experimental study of the electric discharge between metal electrodes of various geometry and technical water within the pressure range of 8 × 103–105 Pa at the saw-tooth voltage generator frequency, f = 40 MHz, and the interelectrode distance, l = 3–30 mm. We consider transfer of the streamer discharge into spark one depending on the geometry of the metal electrode and its material. We investigate the electrical characteristics of the discharge between the plate electrode and the technical water within a wide pressure range. The essential influence of the streamer discharge type on the ozone release within the investigated parameters range is discovered.