We have constructed a pulsed corona discharge system for the removal of air pollutants, such as NOx, SOx and volatile organic compounds (VOCs), in which an emission spectrometry is employed to characterize the generation of excited species by the corona discharge process. Special attention has been paid to overcome noise problems from high voltage power supply, which hampers the measurement of ...

امروزه استفاده از محرک­های پلاسمایی جریان متناوب نسبت به جریان مستقیم، جهت کنترل فعال جریان، متداول­تر بوده و تقریبأ هیچ کار تحقیقی بر روی پلاسمای جریان مستقیم انجام نگرفته است. در این مقاله با استفاده از یک منبع تغذیه جریان مستقیم و هندسه های گوناگون، خصوصیات پلاسما در هر دو حالت corona و dbd (dielectric barrier discharge)  مورد مطالعه قرار گرفت. با استفاده از نتایج این پژوهش مشخص شد که جریان ...

The time dependence of discharge current of negative corona in flowstopped regime has been investigated. The discharge has been generated in the cylindrical reactor equipped with coaxial stainless steel electrodes. The reactor was filled by CO2 + O2 mixtures. The effect of the mixture composition on the discharge current and onset voltage of the discharge has been investigated.

Minimizing the voltage of corona discharges, especially when using nanomaterials, has been of great interest in the past decade or so. In this paper, we report a new corona discharge device by using ZnO nanowires operated in atmospheric air to realize continuous corona discharge excited by hundreds of volts. ZnO nanowires were synthesized on microelectrodes using electric-field-assisted wet che...

Experiments were carried out to determine the effectiveness of a transient plasma, i.e, corona discharge, to initiate a detonation in a short tube. A high-voltage pulse generator used a pseudo-spark switch to discharge a capacitor through a transformer connected to electrodes in the combustion initiator section. The resulting voltage pulse (90 kV for 50 ns) produced a plasma discharge consistin...

In the frame of the internal project PUMA (Plasma Used to Master Aerodynamic), ONERA is conducting fundamental studies in order to determine the limits within which air discharge plasmas are able to interact with aerodynamical phenomena. This paper focuses on the physical and numerical modeling of corona discharges and their interaction with aerodynamics. Using a simple plasma kinetic scheme, i...

The behaviour of positive streamers in air is studied in a rather homogeneous field created by a short plane-protrusion gap in air. Branching is observed to be quite limited, the velocity of the streamers increases with travel distance and “late” streamers are observed. The interaction of streamer heads can be interpreted as electrostatic repulsion, while “late” streamers seem to be attracted b...

Abstract. Two types of DC electrical discharges in atmospheric air (streamer corona and transient spark) were tested for decontamination and decoloration of water contaminated by bacteria and organic dyes. The flowing water passed through the high voltage (HV) needle electrode into the active discharge region. The bacteria were killed most efficiently by transient spark and streamer corona with...