Electric and plasma characteristics of RF discharge plasma actuation under varying pressures

Abstract

The electric and plasma characteristics of RF discharge plasma actuation under varying pressure have been investigated experimentally. As the pressure increases, the shapes of charge-voltage Lissajous curves vary, and the discharge energy increases. The emission spectra show significant difference as the pressure varies. When the pressure is 1000 Pa, the electron temperature is estimated to be 4.139 eV, the electron density and the vibrational temperature of plasma are 4.71×10 11 cm −3 and 1.27 eV, respectively. The ratio of spectral lines I peak 391.4 /I peak 380.5 which describes the electron temperature hardly changes when the pressure varies between 5000-30000 Pa, while it increases remarkably with the pressure below 5000 Pa, indicating a transition from filamentary discharge to glow discharge. The characteristics of emission spectrum are obviously influenced by the loading power. With more loading power, both of the illumination and emission spectrum intensity increase at 10000 Pa. The pin-pin electrode RF discharge is arc-like at power higher than 33 W, which results in a macroscopic air temperature increase.

Evolution of the uniformity in the repetitive unipolar nanosecond-pulse dielectric barrier discharge

“…In addition, the line-ratio technique of OES allows the qualitative diagnosis of electron density and electron temperature [51,64,66]. According to the proposed simplified collisionradiation model [67,68], the variation trends of electron density and electron temperature can be respectively indicated by I 371.1nm /I 380.5nm and I 391.4nm /I 380.5nm .…”

Kinetic roles of vibrational excitation in RF plasma assisted methane pyrolysis

“…The measurement of plasma power consumption is essential for dielectric barrier discharge (DBD) to evaluate electricity efficiency. Lissajous figure, plotting the applied voltage versus integrated charge Q , is often used to calculated power consumption in the DBD reactor [41,42] . The electricity efficiencies at different experimental conditions were among 70%-80% in our study.…”

Effects of the transverse electric field on nanosecond pulsed dielectric barrier discharge in atmospheric airflow

“…In order to reduce errors, each group of data is recorded three times under the same conditions. According to a simplified collision-radiation model, the relative intensity ratio of 371.1 and 380.5 nm (I 371.1nm /I 380.5nm ) can be used to calculate the average electron density n e [35][36][37]. The relationship between where C 0 , C 1 , and C 2 are constant, n is the degree of ionization, and N g =2.5×10 19 cm -3 is the number density of the neutral particles at atmospheric pressure.…”