Schlieren Imaging of Shock-Wave Formation Induced by Ultrafast Heating of a Nanosecond Repetitively Pulsed Discharge in Air

Author

Xu, Da A. ; Lacoste, Deanna A. ; Laux, Christophe O.

Author_Institution

EM2C Lab., Ecole Centrale Paris, Paris, France

Volume

42

Issue

10

fYear

2014

fDate

Oct. 2014

Firstpage

2350

Lastpage

2351

Abstract

We present schlieren images of the hydrodynamic expansion following a nanosecond repetitively pulsed discharge in atmospheric pressure air at room temperature. The discharge is created by voltage pulses of amplitude 7.5 kV, duration 10 ns, applied at a frequency of 1 kHz between two pin electrodes. The electrical energy of each pulse is of the order of 1 mJ. We recorded phase-locked schlieren images starting from a few nanoseconds after the discharge. The time-resolved images show the expansion of the heated gas channel from 50 ns and the shock-wave propagation starting at 0.5 μs.

Keywords

discharges (electric); plasma diagnostics; plasma flow; plasma heating; plasma shock waves; Schlieren imaging; electrical energy; heated gas channel expansion; nanosecond repetitively pulsed air discharge; phase locked Schlieren images; pin electrodes; plasma hydrodynamic expansion; room temperature; shock wave formation; time 10 ns; time resolved images; ultrafast heating; voltage 7.5 kV; Discharges (electric); Heating; Hydrodynamics; Plasma temperature; Shock waves; Sparks; Nanosecond discharges; ultrafast heating; ultrafast heating.;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2014.2311328

Filename

6777296