Schlieren High-Speed Imaging of a Nanosecond Pulsed Atmospheric Pressure Non-equilibrium Plasma Jet

被引：98

作者：

Boselli, M. ^{[1
]}

Colombo, V. ^{[1
,2
]}

Ghedini, E. ^{[1
,2
]}

Gherardi, M. ^{[2
]}

Laurita, R. ^{[2
]}

Liguori, A. ^{[2
]}

Sanibondi, P. ^{[2
]}

Stancampiano, A. ^{[2
]}

机构：

[1] Alma Mater Studiorum Univ Bologna, Ind Res Ctr Adv Mech & Mat CIRI MAM, I-40123 Bologna, Italy

[2] Alma Mater Studiorum Univ Bologna, Dept Ind Engn DIN, I-40123 Bologna, Italy

来源：

PLASMA CHEMISTRY AND PLASMA PROCESSING | 2014年 / 34卷 / 04期

关键词：

Atmospheric pressure non-equilibrium plasma; Schlieren; High-speed imaging;

D O I：

10.1007/s11090-014-9537-1

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The fluid-dynamic characterization by means of Schlieren high-speed imaging of the effluent region of a single electrode plasma jet is presented. The plasma source is powered by a high-voltage generator producing pulses with nanosecond rise time. Time evolution of fluctuations generated in a free flow regime and when the jet is impinging on substrates of different geometries (plain substrates, Petri dishes, etc.) and materials (metal, dielectric covered metal, polystyrene) has been investigated. Plasma ignition causes fluid-dynamic instabilities moving in the direction of the jet flow and correlated with the high-voltage pulses: for low pulse repetition frequency (PRF) (< 125 Hz), the movement of the turbulent front between two voltage pulses can be tracked, whereas for higher PRF (1,000 Hz) the flow is completely characterized by turbulent eddies in the effluent region, without relevant changes between subsequent voltage pulses. When the jet is impinging on a substrate, turbulent fronts propagate over the surface starting from the gas impinging zone.

引用

页码：853 / 869

页数：17

共 21 条

[1] Nanosecond-pulsed uniform dielectric-barrier discharge [J].