Experimental investigation on upstream and downstream discharges in airflows

Zhou, Desheng; Tang, Jingfeng; Zhu, Xi-Ming; Yu, Daren; Zhang, Chaohai

doi:10.1088/2058-6272/aadc05

Cited by 11 publications

(8 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Like other plasmas [41], high-energy excited particles produced by PMA cannot exist for a long time. These particles will collide with neutral gas molecules to form metastable particles with higher stability.…”

Section: Productmentioning

confidence: 97%

Atmospheric pressure pulsed modulated arc discharge plasma

Tang

Zhang

et al. 2023

Plasma Sci. Technol.

View full text Add to dashboard Cite

Direct-current (DC) arc plasma has great application value in the field of chemical industry, but it has the problem of low energy efficiency. Facing the requirement for improving the energy efficiency of the arc, this paper proposes a unique method of Pulsed Modulated Arc (PMA). This method uses high-frequency pulses and reduces the arc current to improve the control of electron temperature. The electrical characteristics, optical characteristics and products are tested. The test results show that during the PMA process, all of the experimental results which include voltage, current and light will significantly increase. These results are analyzed from the perspective of functionality, repeatability and energy conversion. The analysis results show that although the PMA method does not show good parameter consistency, it has potential application prospects because it increases the energy conversion rate by 4.5% and 8% from the perspective of light and products respectively.

show abstract

Section: Productmentioning

confidence: 97%

Atmospheric pressure pulsed modulated arc discharge plasma

Tang

Zhang

et al. 2023

Plasma Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Firstly, the 'edge effect' is considered to be the main reason for this phenomenon. Secondly, the airflow significantly changes the distribution of space ions, and the residual space ions at the inlet of the airflow move to the downstream region under the drag force [8,47]. Therefore, the space ion density at the outlet of the airflow is slightly higher than that at the inlet before next discharge, which causes the discharge to ignite preferentially at the outlet, resulting in a larger positive charge density at the outlet.…”

Section: Effect Of the Airflow Velocity On The Uniformity Of The Surf...mentioning

confidence: 99%

“…Recently, a large number of investigations showed that introducing the airflow to the discharge gap promised to be a good alternative candidate to form uniform discharge [7,8]. The effect of airflow on the uniformity of atmosphericpressure air NPDBD was studied by many researchers.…”

Section: Introductionmentioning

confidence: 99%

Distribution and evolution of surface charges in nanosecond pulsed dielectric barrier discharge under the quiescent air and airflow

Wang¹,

Yan²,

Yu-ying³

et al. 2023

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The surface charges in nanosecond pulsed dielectric barrier discharge (NPDBD) under quiescent air and airflow are detected based on the Pockels effect of electro-optical crystals. In quiescent air, it is found that the surface charge spot propagates and moves in a certain direction due to the combination of the transverse electric field and the thermal accumulation during dozens of consecutive discharge cycles. However, the position of the surface charge spot remains fixed throughout a single discharge cycle (0.83 ms). At the same time, the noticeable decay of surface charges emerges in the above time scales. Furthermore, when the airflow is introduced into the discharge gap, the propagation and movement of surface charges are accelerated. With the increase of airflow velocity, the discharge transforms from a filamentary mode to a diffuse mode, and the distribution of surface charges varies from discrete to uniform. The transition point of the discharge state and charge distribution corresponds to the airflow velocity of 10 m/s. The airflow accelerates the decay of surface charges, resulting in the shrink and dispersion of surface charges, which is considered to be the fundamental reason for the airflow's potential to improve discharge uniformity. The inherent mechanism for achieving uniform discharge is revealed in this study.

show abstract

“…Once the excited particles rise to the metastable state, they cannot spontaneously jump to the ground state, so the metastable particles have a relatively long lifetime. According to [38][39][40], N 2 electronically excited state particles are generated as the main type of excited particles, with a relatively high concentration in the discharge area. Considering different excited states of N 2 molecules, N 2 (A) can be called a metastable particle with a lifetime of about milliseconds; N 2 (B) is always quickly quenched with a muchshorter lifetime of about tens of microseconds.…”

Section: Mechanism Of the Hysteresis Characteristicsmentioning

confidence: 99%

Hysteresis characteristics of the initiating and extinguishing boundaries in a nanosecond pulsed DBD

Tang¹,

Tang²,

Zhou³

et al. 2019

Plasma Sci. Technol.

View full text Add to dashboard Cite

The dielectric barrier discharge (DBD) is presently used in many fields, including plasma medicine, surface modification, and ozone synthesis; the influence of airflow on the DBD is a widely investigated topic. In this work, a hysteresis characteristic on the initiating and extinguishing boundaries is observed in a nanosecond pulsed DBD, which is sensitive to the variation in the airflow velocities and pulse repetition frequencies (PRFs). It is found that, at a certain airflow velocity, the initiating PRF is higher than the extinguishing PRF. This difference between the initiating PRF and the extinguishing PRF leads to a hysteresis phenomenon on the initiating and extinguishing boundaries. When the airflow velocity is increased, both the initiating and extinguishing PRFs are increased and the difference between the initiating PRF and the extinguishing PRF also increased. The hysteresis width between the initiating and extinguishing boundaries is enhanced. To explain these results, the physical processes involved with the seed particles and the mechanisms of forming discharge channels are discussed.

show abstract

Experimental investigation on upstream and downstream discharges in airflows

Cited by 11 publications

References 44 publications

Atmospheric pressure pulsed modulated arc discharge plasma

Atmospheric pressure pulsed modulated arc discharge plasma

Distribution and evolution of surface charges in nanosecond pulsed dielectric barrier discharge under the quiescent air and airflow

Hysteresis characteristics of the initiating and extinguishing boundaries in a nanosecond pulsed DBD

Contact Info

Product

Resources

About