Effect of the Gas-Vortex Stabilization Method on the Plasma Cutting Quality

2020 ◽  
Vol 989 ◽  
pp. 781-786
Author(s):  
I.Y. Matushkina ◽  
S.V. Anakhov ◽  
Yu.A. Pyckin
Keyword(s):  
Metal Cutting ◽  
Thin Sheet ◽  
Gas Injection ◽  
Plasma Jet ◽  
Radial Component ◽  
Kinetic Properties ◽  
Stabilization Method ◽  
Plasma Torches ◽  
Zone Of Influence ◽  
Jet Plasma

Various methods of gas-vortex stabilization in plasma torches for metal cutting are investigated. The influence of an angle of plasma-forming gas injection into the nozzle on kinematic characteristics of the plasma jet is shown. The increase in the radial component of the velocity at the output from the swirler makes it possible to increase the uniformity of velocity distribution and the kinetic properties of jet in the zone of influence on the cut metal. For the cutting of the thin sheet metals, it is advisable to use the technology of "narrow-jet plasma".

Plasma Technology TRIPLEX for the Deposition of Ceramic Coatings in the Industry

2000 ◽  
Author(s):  
G. Barbezat ◽  
K. Landes
Keyword(s):  
Plasma Jet ◽  
Life Time ◽  
Deposition Efficiency ◽  
Ceramic Coatings ◽  
Injection System ◽  
Oxide Ceramic ◽  
Long Distance ◽  
Plasma Gun ◽  
Plasma Torches ◽  
Improved Stability

Abstract As a new plasma gun technology the TRIPLEX system has been introduced in the industrial field two years ago. The core of the TRIPLEX technology is a plasma gun with three cathodes and a long cascaded nozzle consisting of several insulated rings. Only the last ring with a relatively long distance to the cathode is operated as anode. Because of the equal and constant lengths of the three independent arcs, stretching from the three cathodes to the common anode, a stationary plasma jet is generated. Compared to conventional torches, the improved stability of the plasma jet allows a more uniform powder treatment and a higher deposition efficiency as well as the powder feed rate can be increased using a triple injection system. A significantly longer life time of the electrodes reduces the cost for quality control in the coating process. The characteristic properties of oxide ceramic coatings are improved in comparison with the coatings produced by conventional plasma torches. The results of two years industrial application of the innovative torch system TRIPLEX are presented in the paper.

Synthesis of Zinc Oxide (ZnO) Nanoparticle using Non-Transferred DC Thermal Plasma Method: A Morphology Review

2021 ◽  
Vol 9 (7) ◽  
pp. 983-987
Keyword(s):  
Zinc Oxide ◽  
Thermal Plasma ◽  
Plasma Jet ◽  
Zno Nanoparticle ◽  
Nano Zno ◽  
Plasma Method ◽  
Plasma Torches ◽  
Production Parameters ◽  
Plasma Device ◽  
Input Techniques

The increase of nanomaterialusagesuch as nano-ZnO application indeveloping countries is a type of progressthat is beneficial from the engineering standpoint.Being able to controlthe results of nanomaterial production is crucialin this development. To control the outcome is to obtainZnO nanomaterialsproperties which are suitable and in accordance to its intended application.Thisstudy focuses on the morphology ofZnO nanomaterialswhich aresynthesized by non-transferred DC thermal plasmamethod. In this review,parameters of the apparatus regulating the outcomes of the synthesisis studied and analyzed to find certain guidelines that affect nanomaterial morphology. Some of the findings includethe influence ofnon-transferred DC thermal plasma torches main variables such as gas output and powerinputwhich are involved in plasma jet production. It also finds precursor input techniques in which affects the ZnO nanomaterial production outcome. The study indicates that each production parameters on the DC thermal plasma device have different ways in affecting the morphology of the synthesized nanomaterialand it is possible to control them

scholarly journals Diagnostics of Plasma Jet Generated in Water/Argon DC Arc Torch

2016 ◽  
Vol 3 (1) ◽  
pp. 5-8
Author(s):  
O. Hurba ◽  
M. Hlína ◽  
M. Hrabovský
Keyword(s):  
Waste Treatment ◽  
Local Thermodynamic Equilibrium ◽  
Plasma Temperature ◽  
Plasma Jet ◽  
Measured Data ◽  
Plasma Torches ◽  
Enthalpy Probe ◽  
Schlieren Photography ◽  
High Level ◽  
Dc Arc

Thermal plasma jet generated by the torch with water/argon stabilized arc was investigated. Plasma torches of this type have been used for plasma spraying, waste treatment and gasification of organic materials. Electric probes, enthalpy probe, and schlieren photography were used for diagnostics of the jet in the region downstream of the torch exit. Information about structure and shape of plasma jet was evaluated from the measured data. Large extent of radial plasma spread and high level of turbulence were found from both the schlieren and the probe diagnostics. Plasma temperature corresponding to measured ion saturation currents was determined using calculated composition of plasma assuming ex-istence of local thermodynamic equilibrium.

scholarly journals Design of a new gas-dynamic stabilization system for a metal-cutting plasma torch

2021 ◽  
Vol 2094 (4) ◽  
pp. 042075
Author(s):  
I Yu Matushkina ◽  
S V Anakhov ◽  
Yu A Pyckin
Keyword(s):  
Velocity Distribution ◽  
Cross Section ◽  
Plasma Torch ◽  
Metal Cutting ◽  
Evaluation Method ◽  
Dynamic Stabilization ◽  
Stabilization System ◽  
Plasma Torches ◽  
Gas Dynamic ◽  
The Cross

Abstract The analysis of the influence of various design solutions of the gas-dynamic stabilization system in plasma torches for cutting metals on the efficiency of equalizing the velocities of gas flows along the cross-section of the gas path is carried out. It is noted that the efficiency evaluation method developed by the authors should be based on the calculation of the uniformity of the gas flow velocity distribution over the cross-section of the gas-air path of the plasma torch. A vortex stabilization system using two swirlers is proposed. The effect of improving the reliability and quality of plasma cutting is shown. The results of the efficiency studies for the proposed system of gas-vortex stabilization in metal-cutting plasma torches are presented. The calculating results of equalization coefficients for the velocity distribution in different parts of the gas-dynamic stabilization system in the plasma torch are presented. Based on the results of the calculations, a constructive optimization of the gas-air path in the plasma torch was performed. The experimentally obtained advantages of the new upgraded plasma torch in terms of the gas-vortex stabilization efficiency are demonstrated. The effects of improved cutting quality and reduced nozzle wear in the new plasma torch are shown. This is due to the higher degree of the plasma arc stabilization in the new plasma torch, which leads to a decrease in its oscillations, and, consequently, to an increase in the efficiency of the cutting process.

scholarly journals Devolatilization of a particle coal in a plasma reactor

2019 ◽  
Vol 17 (3) ◽  
Author(s):  
Juan Diaz Gomez ◽  
Joel Pacheco Sotelo ◽  
Ricardo Valdivia Barrientos ◽  
Marquidia Pacheco Pacheco
Keyword(s):  
Plasma Reactor ◽  
Volatile Component ◽  
Plasma Jet ◽  
Volatile Components ◽  
Specific Rate ◽  
Reactor Performance ◽  
Jet Stability ◽  
Coal Mixture ◽  
Coal Particles ◽  
Jet Plasma

In this paper, a warm plasma reactor is used to increase the discharge by the addition of 3 different nitrogen-coal carbon mixtures. An experimental study was carried out to determine the temperatures profile in a jet plasma along the chamber, according to nitrogen/coal ratio and power consumption. The coal particle was also characterized in function of its size. An important effect when the volatile components released from the coal is manifested and passing through the plasma jet, this produce the plasma jet increase. This effect has a great importance to performance improvement in plasma reactor profitable for greenhouse gas (GHG) treatment. As a consequence, the high temperature surrounding the plasma jet, augments the degradation capacity. The experimental analysis, the kinetic parameters of the combustion of nitrogen-coal mixture was taking in consideration, as well as the appearence of a considerable amount of new radicals. In addition, increasing the plasma jet has a significant impact on the overall reactor performance of coal particles that release volatile component. This allows promp increase and much enhanced plasma jet stability. The aim of the study was to evaluate and develop a model in order to know the temperature behavior in a plasma jet. Different sizes of coal particles at specific rate of 5 slm (standard liter per minute) of a nitrogrn-coal mixture have been simulated in this model. The advantages of this technique is to simulate other sizes of particle and obtaining the best condition and operating parameters of plasma reactor.

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.

Volt-Ampere and Thermal Features of a Direct-Current Dual-Jet Plasma Generator With a Cold Gas Injection

2010 ◽  
Vol 38 (10) ◽  
pp. 2906-2913 ◽  
Author(s):  
Zhe Wang ◽  
Gui-Qing Wu ◽  
Nan Ge ◽  
He-Ping Li ◽  
Cheng-Yu Bao
Keyword(s):  
Direct Current ◽  
Gas Injection ◽  
Plasma Generator ◽  
Thermal Features ◽  
Jet Plasma ◽  
Cold Gas
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