Numerical simulations were carried out in order to study the channel expansion of a low-energy spark air after breakdown that resulted formation initial arc channel. The spark-discharge model considers electric circuit parameters, gas-dynamic processes, thermal gas ionization, non-equilibrium chemical reactions, electron heat transfer, and radiation. A specific feature is its ability simulate when only parameters (R, L, C) discharge gap length are given. results numerical investigation...

The aim of the work is to study influence length spark gap on energy input into discharge channel during its gas-dynamic expansion. Methodology. research carried out by numerical modeling process development at variable values and invariable other conditions. was set in range from 1 mm 20 mm. conducted using a model development, which takes account processes nonstationary expansion channel, transient electric circuit, nonequilibrium chemical processes, gas ionization, heat transfer electrons...

The method of measuring the energy deposited into gas-discharge gap a low-energy discharge that is based on current and voltage across spark has been analyzed. A numerical model transient in distributed-element circuit used to assess connection impact. effect distance between high-voltage probe tips electrodes correct measurement revealed. difference flowing through gas capacitor evaluated.

An influence of initial gas pressure on energy deposited by spark discharge in nitrogen during the channel expansion is evaluated. Influence efficiency deposition and emitted a simulated. Dependencies dynamic input an correlation coefficient are found out. It was suggested to use average value model load any when formed atmospheric conditions.

The work is devoted to numerical study on thermal radiation in spark discharge. influence of radiative conductivity the expansion channel has been established. effect value capacitance discharge capacitor energy emitted by carried out. change thermodynamic state gas considered taking into account following factors: capacitor, length gap and initial pressure. pressure parameters a under conditions constant breakdown voltage supplied investigated.

The work presents the estimate of distribution spark discharge energy throughout different sources its absorption for problem direct detonation initiation. is obtained by mathematical simulations both transient process in RLC-circuit at nonlinear load and gas dynamic expansion a channel reactive mixture. results oscilloscope recording photography served as initial data simulation. Discharge loss due ohmic heating, near-electrode regions, to dissociation ionization, well uncontrolled supply...

Introduction. One of the directions development plasma technologies consists in formation gas-metal formations and throwing them to a certain distance. Known thrusters either have an electrode system that is prone erosion, or discharge solid dielectric substance which ablation occurs, complex gas-dynamic with fuel supply. They do not provide acceleration atmosphere for significant Purpose. A theoretical experimental study electromechanical thermophysical processes thruster, ensures due...

The method of improving the thermal smoke apparatus is disclosed, which consists in introduction graphite powder into bypass gas ducts power plant T-64 tank, followed by release an aerosol cloud from tank. expanding spectrum masking action curtain, created T-64B tank introducing, addition to diesel fuel, intumescing flow hot exhaust gases tank's plant. At same time, composition curtain formed fuel mainly intended for visible range radiation, and provides, mainly, infrared radiation. In case...

The article presents the results of an experimental study screening properties a bubble obscurant in infrared range radiation. Detection masking effect bubbles was carried out by qualitative and quantitative measurements. A Hikmicro LYNX HM-TS03-25XG/W-LH25 thermal imager used to qualitatively assess bubbles. Fluke TIR27 professional for appearance observation field leads change signature object. In area visual intersection two bubbles, more intense approach contrast background observed than...

Introduction. Work on the creation and throwing of plasma formations is carried out in world's leading scientific centers various ways. The a formation with duration several milliseconds its acceleration an open atmospheric environment to distance 0.5-0.6 m was achieved. To create plasma, energy primary discharge circuit used, followed by gas-plasma help secondary circuit. Plasma also obtained due electric explosion conductor rapidly decreasing strong magnetic field, etc. purpose article...

In the work, research was carried out, which made it possible to reveal peculiarities of process filling barrel periodic-impulse fire extinguishing installation with water. At same time, a mathematical model for simulating processes water injection into pipe subsequent crushing by shock wave substantiated and proposed. To simulate in shaft installation, VOF (volume liquid model) is used, according there no penetration one medium another, based on surface tracking method applied fixed Euler...

A study of the influence discharge gap length and initial gas pressure on energy deposition into channel was done. The conducted at same total energy. It is experimentally shown that connection voltage probe to circuit significantly affects current. determination deposited spark based results numerical simulation development. Experimentally measured currents different pressures were used as data for calculation. Based obtained results, it determined which factors (the or length) has...

Purpose. The purpose of this investigation is to study the changes in redox potential and pH-value tap water as a function underwater spark discharges, storage device capacitance charging voltage. Methodology. To define electric parameters discharge circuit we used Rogowski loop compensated capacitance-ohm divider. determine properties before after treatment following devices: analyzer Anion -7051 with limit absolute error EMF measurement ± 2 mV, BANTE 902 0.002 рН. Results. We managed...

The results of the spark channel expansion simulation in various gases such as hydrogen, oxygen and nitrogen have been presented. Difference thermodynamic properties has taken into account. Influence a type gas on discharge current, resistance, energy deposited gas-dynamic found out. initial species concentration mixture nitrogen, hydrogen detonation initiation by discussed.

The numerical investigation of conditions the "steady" plasma ring induction in electrodynamic accelerator was made. influence a resistance on transition to state determined. dependence coefficient electrical energy conversion into magnetic field number inductor turns and initial velocity found out. technical requirements by which possible formation obtained.

Methodology of calculation thermodynamic parameters gas charge during compression under the conditions vibrational excitation relaxation has been defined. Using mathematical modeling method, on example 5TDF engine air conducted, which allows cold start engine.

The influence of the initial pressure combustible gas mixture on processes that occur during initiation detonation by a spark discharge in high-pressure hydrogen-oxygen was estimated. A onedimensional gas-dynamic model chemically reacting with separation vibrational temperature diatomic molecules from kinetic used for numerical study. It simulated an intensity shock wave causing critical regime is below when 1.013 MPa and exceeds 0.304 MPa. found out process falling near-critical more...