Discharge and Optical Emission Spectrum Characteristics of a Coaxial Dielectric Barrier Discharge Plasma-Assisted Combustion Actuator

Abstract

A coaxial dielectric barrier discharge plasma-assisted combustion actuator (DBD-PACA) system was set up to study its discharge and optical emission spectrum (OES) characteristics in space in this paper. Results showed that each discharge cycle can be divided into four stages: a, b, c, and d. Discharge-on only occurred in stages b and d. Comparatively, the discharge intensity was larger in stage d due to the memory effect of excited electrons. Moreover, Lissajous figure and current-voltage methods were utilized to calculate the power of the coaxial DBD-PACA, and both methods produced roughly similar results. The power presented an upward trend with increasing input voltage and airflow rate. In addition, numerous second positive system (SPS) excited nitrogen molecules were detected from the OES signals. The intensity of the spectral lines (297.54 nm, 315.76 nm, 336.96 nm, and 357.56 nm) first increased, then maintained, and then increased rapidly with the increased radius; however, the intensity of the spectral lines (380.34 nm, 405.80 nm, and 434.30 nm) basically remained unchanged, then increased, and finally decreased with the increased radius. The vibrational temperature first decreased quickly and then increased and reached the minimum at r = 18 mm with the increased radius. The vibrational temperatures at all collection points decreased with the increased input voltage. However, within the range of 0–280 L/min, when r was lower than 15 mm, the vibrational temperatures first increased rapidly and then decreased slowly; when r was greater than 15 mm, the vibrational temperatures first increased and then basically remained stable.

Analysis and examination of the properties and behavior of floating electrode dielectric barrier discharge plasma for medical application

“…Consequently, establishing an aligned electric field creates a discharge with a higher amplitude [41,48]. The precise values of discharge current for all adjustable powers for this device are documented in Table 1.…”

Spectral Analysis of the Effects of Variation in Electrodes' Area for Dielectric Barrier Discharge Actuator

“…The electron temperature increase with the increases of the horizontal distance (decrease of the horizontal surface area of the upper electrode) at 8 kHz, and 9 kHz. This is due to the fact that the electric resistance of the external circuit decreases with the increase in the horizontal distance (decrease of the horizontal surface area), which results in the increase of the discharge voltage across the gap, accordingly, the discharge across the gap is multiplied [27]. An increase in the frequency leads to an increase in the potential difference the two electrodes, leads an in temperature of the electron, as noted from Figure 10.…”

Ozone Generation by Surface Dielectric Barrier Discharge

“…The voltage function was recorded on an oscilloscope with a Tektronix P6015A (Tektronix Inc., Beaverton, OR, USA) high-voltage probe, and the SDBD discharge current was determined from the voltage drop across an R = 100 Ω resistor mounted on a grounding wire. To measure the power dissipated in the SDBD discharge, we used a measuring capacitor method (sometimes also called the Lissajous figures method) [45][46][47]. In this method, a high-voltage capacitor (C = 0.8 nF) is placed between the grounded electrode and the electrical ground (interchangeably with the measuring resistor) to measure the transported charge.…”