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Title: Physical characteristics of gliding arc discharge plasma generated in a laval nozzle

Abstract

The dynamic behavior of gliding arc discharge generated in a Laval nozzle has been investigated by electrical diagnostics and a high-speed camera. The results show that the voltage waveform keeps the initial shape as the gas flow rate is small, while it becomes less stable with increasing flow rate. During the first half of a cycle, the voltage rises and after that it decreases. In nitrogen and oxygen, the break down voltage for the arc is between 3.3 and 5.5 kV, while it is between 3.3-7.5 kV in air. The waveform of current I remains almost stable; and for nitrogen and oxygen, the maximum value of current I is between 0.28 and 0.46 A. With increasing flow rate, the power consumption in air first increases and then decreases; it remains in the range of 110-217 W, and gradually increases in nitrogen and oxygen. The power consumption in oxygen is lower than that in nitrogen; the input of the energy density decreases with increasing flow rate for all the three gases. The development of the arc is tracked and recorded by a high-speed camera. The cycle is stable at 10 ms for flow rates up to 1 m{sup 3} h{sup -1}.more » At a higher flow rate, the cycle becomes unstable.« less

Authors:
; ; ;  [1];  [2]
  1. State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027 (China)
  2. School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275 (China)
Publication Date:
OSTI Identifier:
22072541
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 19; Journal Issue: 7; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; AIR; CAMERAS; ELECTRIC ARCS; ELECTRIC POTENTIAL; ENERGY DENSITY; FLOW RATE; GAS FLOW; NITROGEN; NOZZLES; OXYGEN; WAVE FORMS

Citation Formats

Lu, S. Y., Sun, X. M., Li, X. D., Yan, J. H., and Du, C. M.. Physical characteristics of gliding arc discharge plasma generated in a laval nozzle. United States: N. p., 2012. Web. doi:10.1063/1.4739231.
Lu, S. Y., Sun, X. M., Li, X. D., Yan, J. H., & Du, C. M.. Physical characteristics of gliding arc discharge plasma generated in a laval nozzle. United States. doi:10.1063/1.4739231.
Lu, S. Y., Sun, X. M., Li, X. D., Yan, J. H., and Du, C. M.. Sun . "Physical characteristics of gliding arc discharge plasma generated in a laval nozzle". United States. doi:10.1063/1.4739231.
@article{osti_22072541,
title = {Physical characteristics of gliding arc discharge plasma generated in a laval nozzle},
author = {Lu, S. Y. and Sun, X. M. and Li, X. D. and Yan, J. H. and Du, C. M.},
abstractNote = {The dynamic behavior of gliding arc discharge generated in a Laval nozzle has been investigated by electrical diagnostics and a high-speed camera. The results show that the voltage waveform keeps the initial shape as the gas flow rate is small, while it becomes less stable with increasing flow rate. During the first half of a cycle, the voltage rises and after that it decreases. In nitrogen and oxygen, the break down voltage for the arc is between 3.3 and 5.5 kV, while it is between 3.3-7.5 kV in air. The waveform of current I remains almost stable; and for nitrogen and oxygen, the maximum value of current I is between 0.28 and 0.46 A. With increasing flow rate, the power consumption in air first increases and then decreases; it remains in the range of 110-217 W, and gradually increases in nitrogen and oxygen. The power consumption in oxygen is lower than that in nitrogen; the input of the energy density decreases with increasing flow rate for all the three gases. The development of the arc is tracked and recorded by a high-speed camera. The cycle is stable at 10 ms for flow rates up to 1 m{sup 3} h{sup -1}. At a higher flow rate, the cycle becomes unstable.},
doi = {10.1063/1.4739231},
journal = {Physics of Plasmas},
number = 7,
volume = 19,
place = {United States},
year = {Sun Jul 15 00:00:00 EDT 2012},
month = {Sun Jul 15 00:00:00 EDT 2012}
}
  • An annular-mode gliding arc discharge powered by a 50 Hz alternating current (ac) supply was studied in a vortex flow of dry and humid air. Its temporal evolution characteristics were investigated by electrical measurement, temporally resolved imaging, and temporally resolved optical emission spectroscopic measurements. Three discharge stages of arc-ignition, arc-gliding, and arc-extinction were clearly observed in each half-cycle of the discharge. During the arc-gliding stage, the intensity of light emission from the arc root at the cathode was remarkably higher than that at other areas. The spectral intensity of N{sub 2}(C{sup 3}Π{sub u}−B{sup 3}Π{sub g}) during the arc-ignition stage was muchmore » higher than that during the arc-gliding stage, which was contrary to the temporal evolutions of spectral intensities for N{sub 2}{sup +}(B{sup 2}Σ{sub u}{sup +}−X{sup 2}Σ{sub g}{sup +}) and OH(A{sup 2}Σ{sup +}−X{sup 2}Π{sub i}). Temporally resolved vibrational and rotational temperatures of N{sub 2} were also presented and decreased with increasing the water vapor content.« less
  • A non-thermal gliding arc discharge was generated at atmospheric pressure in an air flow. The dynamics of the plasma column and tracer particles were recorded using two synchronized high-speed cameras. Whereas the data analysis for such systems has previously been performed in 2D (analyzing the single camera image), we provide here a 3D data analysis that includes 3D reconstructions of the plasma column and 3D particle tracking velocimetry based on discrete tomography methods. The 3D analysis, in particular, the determination of the 3D slip velocity between the plasma column and the gas flow, gives more realistic insight into the convectionmore » cooling process. Additionally, with the determination of the 3D slip velocity and the 3D length of the plasma column, we give more accurate estimates for the drag force, the electric field strength, the power per unit length, and the radius of the conducting zone of the plasma column.« less
  • The problem of the expansion of a dense, low-temperature helium plasma in a Laval nozzle is considered. The equations of level-by-level kinetics are solved numerically together with the equations of plasma dynamics in a quasi-one-dimensional approximation. The results of the calculations and the dependence of the solutions on the initial conditions in the critical cross section are discussed. The solutions are compared with a model approximation of a stationary sink and experimental results, showing their satisfactory agreement.