scholarly journals Исследование коаксиального ускорителя плазменной струи

2020 ◽  
Vol 90 (6) ◽  
pp. 1028
Author(s):  
А.В. Воронин ◽  
В.Ю. Горяинов ◽  
В.К. Гусев
Keyword(s):  
Infrared Camera ◽  
Plasma Jet ◽  
Front Velocity ◽  
Ionization Front ◽  
Deuterium Plasma ◽  
Central Electrode ◽  
Energy Parameters ◽  
Voltage Polarity ◽  
Discharge Formation ◽  
Coaxial Accelerator

Results of main energy parameters of plasma jet investigation of coaxial accelerator with a conical insert in the region of discharge formation are presented. The dependences of the pressure and diameter of the deuterium plasma jet on the distance to the accelerator as well as its length and voltage polarity on the electrodes are obtained. The square growth of plasma jet energy with increasing voltage is shown. Among all the tested modifications the most effective was an accelerator with length not exceeding 220 mm, negative voltage polarity at the central electrode and focusing conical insert at the beginning of the outer electrode. Deuterium plasma with ionization front velocity of more than 100 km/s and pressure of more than 1 MPa at the source output was obtained. Method for measuring jet pressure using a deflecting screen and FLIR SC7300M infrared camera is presented.

Inverse Calculation of Flame Impingement Heat Transfer

2006 ◽  
Author(s):  
Ikram Ahmed ◽  
Ildar Sabirov
Keyword(s):  
Heat Transfer ◽  
Radial Distance ◽  
Infrared Camera ◽  
Jet Impingement ◽  
Plasma Jet ◽  
Impingement Heat Transfer ◽  
Direct Measurements ◽  
Polynomial Series ◽  
Gas Flame ◽  
Volume Method

Inverse calculations are presented here for the estimation of heat transfer from an impinging flame on a flat surface. This work is a preliminary exercise for estimating heat transfer from an impinging plasma jet, where direct measurements can be very difficult and costly, and the correlations based on air or water jet impingement measurements may not be applicable because of the very high temperature (and property) gradients. As the gas flame impinges on an initially cold flat plate, the temperature evolution on the backside is recorded using an infrared camera. The time–temperature data thus obtained are then compared with those predicted by a finite volume method based code. The code uses a polynomial series for estimating the convection coefficient, which varies with radial distance. The coefficients of this polynomial are treated as a set of parameters to be estimated through the Levenberg-Marquardt approach. The results obtained so far indicate that it may be possible to use such an approach for estimating heat transfer from a plasma jet.

Bullet-shaped ionization front of plasma jet plumes driven by microwave pulses at atmospheric gas pressure

2017 ◽  
Vol 122 (9) ◽  
pp. 093301 ◽  
Author(s):  
Zhaoquan Chen ◽  
Guangqing Xia ◽  
Changlin Zou ◽  
Xiaodong Liu ◽  
Deren Feng ◽  
...  
Keyword(s):  
Plasma Jet ◽  
Gas Pressure ◽  
Ionization Front ◽  
Microwave Pulses ◽  
Jet Plumes

Untersuchungen an stromstarken Kapillarentladungen. Teil II: Kinematische, elektrische und Druck-Messungen / Investigations on High Current Capillary-Discharges. Part II: Kinematic, Electric and Pressure Measurements

1972 ◽  
Vol 27 (3) ◽  
pp. 520-525
Author(s):  
Horst Ehrich ◽  
Hans Jürgen Kusch
Keyword(s):  
Electrical Conductivity ◽  
Theoretical Calculations ◽  
Plasma Jet ◽  
Front Velocity ◽  
Pressure Probe ◽  
Pressure Measurements ◽  
High Current ◽  
Electrical Measurements ◽  
Streaming Velocity ◽  
Jet Plasma

AbstractHigh-current discharges through "Plexiglas" capillaries are investigated with several methods. The front velocity of the plasma jet is obtained by cinematographic techniques, and the streaming velocity by admixing sodium to the jet plasma. Piezoelectric pressure measurements lead, in agreement with other methods, to values of 120 atm at 10 kamps (2 mm diameter of the capillary) ; special care was taken for the dynamical calibration of the pressure probe. From electrical measurements, the electrical conductivity is obtained and compared with theoretical calculations.

A Study of Ionization Front Velocity in dc Pulsed Plasmas

1987 ◽  
Vol 27 (4) ◽  
pp. 283-292
Author(s):  
A. Dengra ◽  
M. A. Hernandez ◽  
V. Colomer
Keyword(s):  
Front Velocity ◽  
Ionization Front ◽  
Pulsed Plasmas

scholarly journals Initiation of the plasma jet of the magneto-plasma compressor by the external plasma source

2021 ◽  
Vol 2100 (1) ◽  
pp. 012005
Author(s):  
V G Brovkin ◽  
A I Klimov ◽  
I Ch Mashek ◽  
A S Pashchina ◽  
N M Ryazansky ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Plasma Jet ◽  
Plasma Source ◽  
Liquid Mixtures ◽  
Plasma Jets ◽  
Front Velocity ◽  
Erosion Plasma ◽  
Gas Plasma ◽  
Preliminary Study ◽  
First Time

Abstract The results of a preliminary study of the interaction of supersonic gas-plasma flows created by a magneto-plasma compressor and a pulsed erosion plasma jet are presented. Stable initiation of the MPC discharge at atmospheric pressure was achieved for the first time. The advantage of using the coaxial arrangement of plasma jets sources for MPC discharge initiation is shown. A noticeable change in the shock wave front velocity and pressure (up to 20%), created during the MPC discharge and dispersed powders and liquid mixtures interaction, is discovered.

scholarly journals A plasma focus device as a metallic plasma jet generator

2016 ◽  
Vol 34 (2) ◽  
pp. 356-361 ◽  
Author(s):  
A. Kasperczuk ◽  
M. Paduch ◽  
K. Tomaszewski ◽  
E. Zielinska ◽  
R. Miklaszewski ◽  
...  
Keyword(s):  
Plasma Focus ◽  
Laser Interferometer ◽  
Initial Pressure ◽  
Plasma Jet ◽  
Pinhole Camera ◽  
Plasma Sheath ◽  
Plasma Focus Device ◽  
Small Radius ◽  
Deuterium Plasma ◽  
X Ray

AbstractThis paper aims at a test of a plasma focus (PF) device as a metallic plasma jet generator. The experiment was carried out at the DPF-1000U device in which the inner electrode face was conically shaped. Deuterium (D2) with the initial pressure of 0.9 Torr was used as a filling gas. In the experiment, a metallic plasma was ensured due to erosion of the inner electrode during a PF discharge. To create the metallic plasma jet, the eroded copper (Cu) plasma, swept by the deuterium plasma sheath, was accelerated axially and compressed to very small radius (about 1–2 mm). The Cu plasma jet achieved a velocity of 3 × 107 cm/s. To study processes of the plasma jet creation and propagation a 16-frame laser interferometer and a four-frame X-ray pinhole camera were used. Recorded images prove a successful adaptation of the PF device to the metallic plasma jet generator.

scholarly journals Исследование рельсового электромагнитного источника плазменной струи

2019 ◽  
Vol 89 (7) ◽  
pp. 1021
Author(s):  
А.В. Воронин ◽  
В.Ю. Горяинов ◽  
В.К. Гусев ◽  
А.Н. Новохацкий ◽  
С.А. Поняев
Keyword(s):  
Kinetic Energy ◽  
Test Bench ◽  
Plasma Jet ◽  
Video Camera ◽  
Deuterium Plasma ◽  
Mechanism Of Formation ◽  
Infrared Video ◽  
High Kinetic Energy ◽  
Electromagnetic Accelerator ◽  
Additional Magnetic Field

Abstract The study of elements of rail electromagnetic accelerator (railgun), aimed at studying the mechanism of formation of the dense and free from impurities plasma jet with high kinetic energy is presented. The accelerator was tested with pulsed gas inlet, different shape and length of electrodes, as well as with an additional magnetic field created by external conductors with current. The method controlling of plasma jet parameters on test bench with the use of pressure sensor and infrared video camera was developed. The dependence of the pressure of deuterium plasma flow on distance to the accelerator was investigated. The kinetic energy of the jet was estimated.

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