Dynamic behavior of a rotating gliding arc plasma in nitrogen: effects of gas flow rate and operating current

2017 ◽  
Vol 19 (4) ◽  
pp. 045401 ◽  
Author(s):  
Hao ZHANG ◽  
Fengsen ZHU ◽  
Xiaodong LI ◽  
Changming DU
2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040059
Author(s):  
Qingxian Hu ◽  
Lei Zhang ◽  
Juan Pu ◽  
Caichen Zhu

A three-dimensional numerical model of arc in gas metal arc welding (GMAW) with single cable-typed wire was established based on the theory of arc physics. The influences of different shielding gas flow rates on the features of temperature field, velocity field and pressure field were investigated. The results showed that the maximum velocity of arc plasma along radial direction and the arc pressure on the surface of workpieces were increased obviously with the increase of the shielding gas flow rate, while the arc temperature was changed little. This phenomenon was mainly attributed to the increasing collisions between arc plasmas and the self-rotation action of cable-typed wires. The arc temperature at the tip of the cable-typed wire reached the maximum. The maximum flow velocity of arc plasma was located at the tip of wire (2–8 mm). The arc pressures in the central axis reached the maximum pressure. The simulation results were in agreement with the experimental results.


Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 684 ◽  
Author(s):  
Weiqi Chen ◽  
Di Jin ◽  
Wei Cui ◽  
Shengfang Huang

Based on an experimental system involving a pulsating airflow burner and gliding arc generator, the characteristics of gliding arc plasma at different flow rates and its control effect on the static instability of the swirl flame have been studied. The current, voltage, and power wave forms, as well as the simultaneous evolution of plasma topology, were measured to reveal the discharge characteristics of the gliding arc. A bandpass filter was used to capture the chemiluminescence of CH in the flame, and pressure at the burner outlet was acquired to investigate the static instability. Experimental results showed that there were two different discharge types in gliding arc plasma. With the low flow rate, the glow type discharge was sustained and the current was nearly a sine wave with hundreds of milliamperes of amplitude. With the high flow rate, the spark type discharge appeared and spikes which approached almost 1 ampere in 1 μs were found in the current waveform. The lean blowout limits increased when the flame mode changed from stable to pulsating, and decreased significantly after applying the gliding arc plasma. In pulsating flow mode, the measured pressure indicated that static instability was generated at the frequency of 10 Hz, and the images of flame with plasma showed that the plasma may have acted as the ignition source which injected the heat into the flame.


2011 ◽  
Vol 39 (11) ◽  
pp. 2900-2901 ◽  
Author(s):  
Xin Tu ◽  
Helen J. Gallon ◽  
J. Christopher Whitehead

2017 ◽  
Vol 26 (4) ◽  
pp. 045014 ◽  
Author(s):  
Lucia Potočňáková ◽  
Jiří Šperka ◽  
Petr Zikán ◽  
Jack J W A van Loon ◽  
Job Beckers ◽  
...  

2016 ◽  
Vol 24 (3S2) ◽  
pp. 103-108
Author(s):  
Do Hoang Tung ◽  
Bach Sy Minh ◽  
Vu Thi Thom ◽  
Lam Thi Huyen Trang ◽  
Cao Thi Huong ◽  
...  

A cold atmospheric pressure gliding arc plasma jet hasbeen developed and applied to disinfection. The size of the plasma output is about 6 mm in diameter and 10 mm in length. Ar gas at a flow rate of 10 slm and 25 W plasma power are used. Plasma discharge is produced between the divergent electrodes and the jet appears as an effluence of the gas flow. When a \textnormal{pseudomonas} culture is placed at 8 mm below the torch for 1minute, where the gas is at room temperature, the bacteria within a 16 mm diameter circle are almost completely killed. As the UV radiation is well below the safety regulation, the bacteria are inactivated by the total effect of UV radiation and others like the reactive species and the charged particles.


2006 ◽  
Vol 6 (2) ◽  
pp. 76
Author(s):  
Antonius Indarto ◽  
Jae-Wook Choi ◽  
Hwaung Lee ◽  
Hyung Keun Song

Decomposition of carbon dioxide (C02) by gliding arc plasma was examined. The plasma reactor was consisted of two triangles stainless steel plates which was connected to a 20 kV AC power supply. The gas entered through a nozzle tube from the upstream cylinder reactor and exit at the downstream of the reactor. The effect of total gas flow rates have been used to study the chemical process reaction in gliding plasma system. The model of active-chemical kinetic of C02 decomposition was built to explain the way of plasma reaction. Experiment results indicate the conversion of C02 reached 18% at the total gas flow rate of 1.5' 10.5m3s'1and produced CO and 02 as the main gaseous final products.


2021 ◽  
pp. 42-46
Author(s):  
Ananthanarasimhan J ◽  
Lakshminarayana Rao

Understanding breakdown phenomena in rotating gliding arc discharge (RGA) is of interest to tailor them for specific applications. This work revealed that the breakdown voltage in a RGA reactor was not dictated by collisional effects i.e., change in flow rate. The observation was consistent for both the discharge gas medium argon and nitrogen. The collisional effect variation was implemented by varying the operating flow rates i.e., 5 SLPM which is transitional in nature, and 50 SLPM which is turbulent in nature having localized micro-eddies. The observation also indicated failure of Paschen law in RGA having shortest gap between the electrodes of order of mm, operated under atmospheric pressure conditions. Collisional ineffectiveness indicates possibility of streamer formation which needs to be further investigated in future. This work marks preliminary and important step towards understanding the breakdown phenomena in atmospheric RGAs operated under different flow regimes such as laminar/transitional and turbulent.


2015 ◽  
Vol 7 (1) ◽  
pp. 1316-1323 ◽  
Author(s):  
Gamal Elaragi

Gliding Arc Discharge plasma has properties of both thermal and non-thermal plasma conditions. Gliding arc discharge plasma in the atmospheric pressure with argon/nitrogen and its characteristics are described. Some experimental results about alternating current gliding arc plasma generator have been obtained. It seems that the current density strongly depends on the gas, and increased with increasing discharge current and gas flow rate. Also, the discharge current of gliding arc Discharge plasma in Nitrogengas is greater than one in Argon gas because of Nitrogen gas need to higher breakdown voltage than Argon gas. The intensity of gliding arc discharge plasma increased with increasing the gas flow rate. In addition to the oscillograms of discharge current in each case of Argon & Nitrogen were obtained. Electron temperatures of Argon and Nitrogen plasma were calculated to be 22800 K, 8400 K. The characteristics of both Argon & Nitrogen gases in atmospheric pressure were investigated like current density, electron density with flow rates (5, 10, 20, and 40) Standard Cubic foot per Hour. All the experimental results were tabulated.


2019 ◽  
Vol 268 ◽  
pp. 04008
Author(s):  
Atsushi Nakajima ◽  
Satoshi Kodama ◽  
Hidetoshi Sekiguchi

In this paper, the interaction between particles and gliding arcs in a spouted bed reactor combined with gliding arc discharge was investigated using a high-speed camera. Based on the images captured by the camera, we evaluated the retention time for gliding arcs, the contact frequency of particles with the gliding arc, and the passage area of the gliding arc until its disappearance. The effects of the gas flow rate; electrode angle, which is same as the cone angle of the spouted bed; and applied voltage of gliding arcs were investigated. The retention time for gliding arcs was extended by a high applied voltage, the passage area was increased at a high gas flow rate, and the contact frequency was increased by decreasing the electrode angle. The results obtained here can support the optimization of particle treatment processes in a spouted bed with gliding arc discharge.


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