Non-equilibrium constricted dc glow discharge in N₂ flow at atmospheric pressure: stable and unstable regimes

Abstract

The experimental results from the study of a constricted glow discharge in turbulent flow of nitrogen at atmospheric pressure are presented. The discharge was induced by a dc high voltage superimposed between pin-to-plane electrodes inserted inside a glass tube of 1 cm diameter. At a low current I < 20 mA it is established that the properties of the constricted glow discharge in gas flow are strongly different from those in gas at rest: the discharge in gas flow exhibits four different current regimes instead of only a single one in gas at rest. One of these regimes corresponds to a spiral twisting of gas flow by the constricted glow discharge. This effect can be used properly in plasma actuators designed for atmospheric pressure flow control. Gas blowing also enables the constricted N2 plasma to be in a strong non-equilibrium state with vibration and gas temperatures of about 6000 K and 600 K, respectively. So, a constricted discharge in N2 flow can serve as a compact and effective non-thermal plasma source useful in the remote treatment of different surfaces.

Direct current plasma jet at atmospheric pressure operating in nitrogen and air

“…The use of N 2 or air plasma in glow like mode has been discussed by many groups, e.g., Akishev et al [15][16][17] where the role of different discharge parameters on the plasma stability has been checked and analyzed. In the present study, a stable atmospheric pressure DC discharge has been obtained by using a high gas flow and a high ballast of the DC power supply.…”

“…In the present study, a stable atmospheric pressure DC discharge has been obtained by using a high gas flow and a high ballast of the DC power supply. Based on results of our previous experiments 6 and data, 15,16 the ballast resistance of the a)…”

“…The intensive N 2 molecular bands in the spectra indicate that discharge generates abundant metastable electronic excited nitrogen molecules and ionized species, such as N 2 (A), N 2 (B), N 2 (C), N 2 (a), and N þ 2 . 16,24,25 Due to the relatively low excitation energy (6.17 eV), direct electron impact excitation by reaction (5) and the collisions between vibrational nitrogen molecules by reaction (6) contribute to the population of the excited state N 2 (A):…”

Atmospheric Pressure Pulsed-Periodical Spark Generator Forming Fast Moving Non-Equilibrium Plasma Clouds

“…It results in strong diminishing of both electron temperature and electron density in plasma cloud that leads practically to the absence of the excitation of molecular and atomic electron states by electron impact. That is why there is no emission of 1 + and 2 + N 2 systems from plasma clouds (note that just the same situation was observed in steady-state plasma jet in N 2 [12]). Nevertheless, there is strong emission from the clouds in the Fe I lines.…”

Triggering of cold-cathode thyratron in electric circuit with grounded grid

“…4,24 At a later time, due to explosive emission process, 4,24-29 the arc cathode spot is initiated and glow-to-arc transition occurs. 4,[30][31][32][33][34] Note that the other method of the switch triggering depends on the so called electric circuit of classical thyratron. 5,6 In this circuit, the only grounded electrode is the cathode C 1 .…”