Experimental study of the hydrodynamic expansion following a nanosecond repetitively pulsed discharge in air

Da A. Xu (1, 2) , Deanna A. Lacoste (1, 2) , Diane L. Rusterholtz (1, 2) , Paul-Quentin Elias (3) , Gabi D. Stancu (1, 2) , C. Laux (1, 2)

1 EM2C - Laboratoire d'Énergétique Moléculaire et Macroscopique, Combustion
2 Ecole Centrale Paris
3 ONERA - The French Aerospace Lab [Châtillon]

We report on an experimental study of the hydrodynamic expansion following a nanosecond repetitively pulsed (NRP) discharge in atmospheric pressure air preheated up to 1000 K. Single-shot schlieren images starting from 50 ns after the discharge were recorded to show the shock-wave propagation and the expansion of the heated gas channel. The temporal evolution of the gas temperature behind the shock-front is estimated from the measured shock-wave velocity by using the Rankine-Hugoniot relationships. The results show that a gas temperature increase of up to 1100 K can be observed 50 ns after the nanosecond pulse.

Mots clés: aerodynamics; channel flow; flow visualisation; hydrodynamics; shock waves; schlieren; ultra-fast heating

Domaines: Plasmas; Physique des plasmas [physics.plasm-ph]; Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]; Thermique [physics.class-ph]; Thermique [physics.class-ph]; Optique [physics.optics]

Da A. Xu, Deanna A. Lacoste, Diane L. Rusterholtz, Paul-Quentin Elias, Gabi D. Stancu, et al.. Experimental study of the hydrodynamic expansion following a nanosecond repetitively pulsed discharge in air. Applied Physics Letters, 2011, 99 (121502), http://apl.aip.org/resource/1/applab/v99/i12/p121502_s1. ⟨10.1063/1.3641413⟩. ⟨hal-00651381⟩