scholarly journals Polymeric Ablation Induced by Free Burning Arcs in Air

2017 ◽  
Vol 4 (2) ◽  
pp. 149-152
Author(s):  
M. Bator ◽  
R. Bianchetti ◽  
P. Suetterlin
Keyword(s):  
Mass Loss ◽  
Low Voltage ◽  
Simplified Model ◽  
Contact Material ◽  
Arc Plasma ◽  
Ablation Process ◽  
Experimental Conditions ◽  
Plasma Properties ◽  
Model Geometry ◽  
Arc Current

We investigate the influence of switching arcs on different polymers and their interaction. We describe a set of experiments on a simplified model geometry typical for low voltage switchgear. In a broad range of experimental conditions and parameters such as arc current, polymeric material or contact material, the voltage, the mass loss and the corresponding pressure build-up are examined. From this raw data, we deduce the arc influence on the ablation process as well as the feedback on some arc plasma properties.

Research on Neutral Grounding Reactance Allocation with MCR

2013 ◽  
Vol 816-817 ◽  
pp. 997-1001
Author(s):  
Ren Wei Liu ◽  
Zhong Dong Yin ◽  
Song Wei Cao ◽  
Heng Rui Ma
Keyword(s):  
High Voltage ◽  
Low Voltage ◽  
Current Theory ◽  
Equivalent Model ◽  
Experimental Conditions ◽  
Magnetic Valve ◽  
Arc Current ◽  
High Voltage Transmission ◽  
Controllable Reactor ◽  
Physics Experiments

For the arc current generated during the reclosing of the high-voltage transmission system, small reactance configuration compensation and control strategy. By the magnetically controlled reactor is researched. First analyzing the principle that high-pressure single-circuit and double-circuit on the same pole line suppresses arc current, then establishing the magnetron controlled reactor equivalent model in PSCAD, on this basis, establishing simulation using magnetron reactors to suppress secondary arc current circuit under the conditions of high voltage transmission lines , designing and implementing of a magnetic valve controllable reactor inhibition of arc current physics experiments under of a low-voltage experimental conditions analoging high-voltage actual line condition. At last, the comparison of PSCAD simulation waveform and physics experiments of Power Quality the analyzer topas2000 and oscilloscope output verify the magnetic valve controllable reactor to suppress the arc current theory feasibility and effectiveness.

FIELD STRENGTH IN PULSED MERCURY ARCS

1965 ◽  
Vol 43 (4) ◽  
pp. 670-675 ◽  
Author(s):  
B. Ahlborn ◽  
A. J. Barnard ◽  
H. D. Campbell
Keyword(s):  
Field Strength ◽  
Mercury Vapor ◽  
Average Field ◽  
Arc Plasma ◽  
Cathode Fall ◽  
Arc Current ◽  
Mercury Electrodes ◽  
The Relationship ◽  
Pulsed Arc ◽  
Arc Current And Voltage

In a pulsed arc with mercury electrodes the average column field strength Eco was measured for different currents I, and the relationship [Formula: see text] was found. The variations of arc current and voltage with time indicate that the anode and cathode fall regions have a combined thickness of 3 × 10−6 cm, and an average field strength of 2 × 106 V/cm. The arc plasma is formed mainly from mercury vapor, rather than from the surrounding gas.

Relationships between arc plasma jet properties and plasma/liquid interaction mechanisms for the deposition of nanostructured ceramic coatings

2021 ◽  
Author(s):  
Vincent Rat ◽  
Marguerite Bienia ◽  
Gayatri Dasharath Dhamale ◽  
Fabrice Mavier ◽  
Céline Ruelle ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Plasma Jet ◽  
Ceramic Coatings ◽  
Nanostructured Coatings ◽  
Arc Plasma ◽  
Pulsed Plasma ◽  
Plasma Properties ◽  
Interaction Mechanisms ◽  
Technical Requirements ◽  
Major Interest

Abstract Ceramic nanostructured coatings with intermediate thicknesses between 10 and 100 µm exhibit improved thermal and mechanical properties for thermal barrier coatings or wear resistant coatings. Such coatings comply with the technical requirements of aeronautical and automotive applications. This implies to develop deposition processes with high throughput and deposition rates promoting the formation of nanostructured coatings. The use of a liquid phase as a carrier medium of nanoparticles or of solution precursors has been shown to be of major interest when being injected within a thermal plasma jet. The as-sprayed materials can form ceramic nanostructured coatings provided the liquid injection encompassing the physicochemical properties of liquid and its injection method copes with the plasma properties. Especially the repeatability of the interaction phenomena between the liquid phase and the arc jet has a key role in the efficiency deposition so that some research efforts are devoted to stabilize the arc while a liquid jet is continuously injected within the plasma. Alternatively a pulsed arc plasma jet can be generated and associated with a time-phased injection of droplets. This paper presents the different issues related to the arc plasma properties produced by direct plasma torches including the arc instabilities and their influence on plasma/liquid interaction mechanisms leading to the formation of nanomaterials. A focus is made on pulsed plasma spraying associated with a synchronized injection of microsized droplets by means of an inkjet printing method.

scholarly journals Time-Resolved Emission Spectroscopy Measurements during the Restrike Period in Arc Plasma Torch

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Alan Mašláni ◽  
Peter Ondáč ◽  
Viktor Sember ◽  
Milan Hrabovský
Keyword(s):  
Plasma Torch ◽  
Temporal Evolution ◽  
Argon Plasma ◽  
Anode Surface ◽  
Temperature Profiles ◽  
Arc Plasma ◽  
Electrical Measurements ◽  
Plasma Properties ◽  
Time Resolved ◽  
Arc Plasma Torch

Simultaneous optical, spectroscopic, and electrical measurements in the region of the arc anode attachment of the water-argon plasma torch are presented. A movement of the arc attachment along the anode surface together with its restrike mode is monitored. Temporal evolution of temperature during one cycle of the restrike mode is obtained in three different axial positions in the plasma column. Resulting temperature profiles show how the position of the arc attachment influences the plasma properties.

Simulation of the Effects of Several Factors on Arc Plasma Behavior in Low Voltage Circuit Breaker

2005 ◽  
Vol 7 (5) ◽  
pp. 3069-3072 ◽  
Author(s):  
Li Xingwen ◽  
Chen Degui ◽  
Wang Qian ◽  
Li Zhipeng
Keyword(s):  
Low Voltage ◽  
Circuit Breaker ◽  
Arc Plasma ◽  
Plasma Behavior

Mechanical properties and erosive behaviour of 10TiO2-Cr2O3 coated CA6NM turbine steel under accelerated conditions

2019 ◽  
Vol 16 (1) ◽  
pp. 64-70 ◽  
Author(s):  
Khushdeep Goyal
Keyword(s):  
Mechanical Properties ◽  
Mass Loss ◽  
Average Particle Size ◽  
Average Particle ◽  
Slurry Erosion ◽  
Experimental Conditions ◽  
Content Type ◽  
Uncoated Steel ◽  
Erosion Test ◽  
Turbine Steel

Purpose This paper aims to evaluate the mechanical properties and slurry erosion behaviour of 10TiO2-Cr2O3 coated turbine steel. Design/methodology/approach Slurry erosion experiments were performed on the coated turbine steel specimens using slurry erosion test rig under accelerated conditions such as rotational speed, average particle size and slurry concentration. Surface roughness tester, Vickers microhardness tester and scanning electron microscope were used to analyse erosion mechanism. Findings Under all experimental conditions, 10TiO2-Cr2O3 coated steel showed better slurry erosion resistance in comparison with Al2O3 coated and uncoated steel specimens. Each experimental condition indicated a significant effect on the erosion rate of both coatings and uncoated steel. The surface analysis of uncoated eroded specimen revealed that plastic deformation, ploughing and deep craters formation were the reasons for mass loss, whereas microchipping, ploughing and microcutting were the reasons for mass loss of coated specimens. Originality/value The present investigation provides novel insight into the comparative slurry erosion performance of high velocity oxy fuel deposited 10TiO2-Cr2O3 and Cr2O3 coatings under various environmental conditions. To form modified powder, 10 Wt.% TiO2 was added to 90 Wt.% Cr2O3.

scholarly journals 3D Analysis of Low-Voltage Gas-Filled DC Switch Using Simplified Arc Model

2019 ◽  
Vol 6 (1) ◽  
pp. 65-68 ◽  
Author(s):  
S. Gortschakow ◽  
D. Gonzalez ◽  
S. Yu ◽  
F. Werner
Keyword(s):  
High Speed ◽  
Low Voltage ◽  
Black Box ◽  
Optical Observations ◽  
3D Analysis ◽  
High Speed Camera ◽  
Plasma Model ◽  
Arc Model ◽  
Arc Current ◽  
Electro Magnetic

Electro-magnetic simulations have been used for the visualization of distribution of Lorentz force acting on a DC switching arc in low-voltage contactor. A simplified plasma model (black-box model) was applied for the description of arc conductivity. Arc geometry was gained from the high-speed camera images. Influence of arc position, arc current and of external magnetic field has been studied. Results have been compared with optical observations of the arc dynamics.

scholarly journals Impact of Modeling Simplifications on Lightning Strike Simulation for Aeroengine

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Yi-fan Qian ◽  
Zhi-feng Ye ◽  
Hai-bo Zhang
Keyword(s):  
Simulation Analysis ◽  
Simulation Software ◽  
Simplified Model ◽  
Lightning Strike ◽  
Electromagnetic Simulation ◽  
Experimental Conditions ◽  
Turbofan Engine ◽  
Engine Model ◽  
Simulation Results ◽  
The Difference

With the development of electromagnetic simulation software and affordable hardware, it is allowed for us to complete simulations for EMC purposes. However, simulation demands will be immense when simulations for models with complex structures, especially aircraft components, have to be solved. Hence, it is meaningful to investigate how to minimize the computational demands. One of the solutions to reduce the simulation expense is the simplification for the simulated model. But the simplified model should be guaranteed to provide credible simulation results which do not deviate from the original model apparently. Generally, the difference between the simulation results and experimental data is estimated, or if the experimental conditions are not achieved, the comparison between the simplified model and the original one has to be analyzed, at least. This paper explores the electromagnetic simulation of a turbofan engine encountering lightning strike. With the simplifications of different components on the turbofan engine, the influences on induced currents of engine controller cables are simulated and analyzed based on the transmission-line matrix method. A combining method of components removal and geometric structure simplification is proposed to simplify the whole engine model. Simplified components include compressor, combustion chamber, turbine, and nozzle. The effects of different simplification methods are quantified, and the rationality of the simplified model is verified by simulation analysis.

Synthesizing Cubic Diamond Crystal Using DC Plasma Jet CVD

2019 ◽  
Vol 825 ◽  
pp. 71-76
Author(s):  
Hiromichi Toyota ◽  
Xia Zhu ◽  
Ryoya Shiraishi ◽  
Kazuto Nakajima ◽  
Yukiharu Iwamoto ◽  
...  
Keyword(s):  
High Speed ◽  
Catalytic Effect ◽  
Plasma Jet ◽  
Methanol Solution ◽  
Arc Plasma ◽  
Plasma Power ◽  
Experimental Conditions ◽  
Diamond Crystals ◽  
Dc Arc ◽  
Solution Gas

Diamond crystals are successfully synthesized by irradiating DC arc plasma jet to the substrate set in a methanol solution. It is the important procedure to preheat the substrate by inert Ar plasma jet before introducing the methanol solution gas to the plasma jet gun. The effects of two experimental conditions, the incident power and the substrates, are investigated. In the case of the Si substrate, cubic crystalline diamond grains of same size are synthesized at the plasma power of 470W. High speed hetero epitaxy is expected by using this method. In the case of the tungsten carbide substrate, diamond crystals and carbon nanotubes are simultaneously synthesized at the plasma power of 260W. The catalytic effect of Co binder in the substrate may cause the chemical reaction of the nanotube synthesis.

Sign in / Sign up

Export Citation Format

Share Document