Quasi-DC electrical discharge characterization in a supersonic flow
A Quasi-DC (Q-DC) electrical discharge generates a highly transient filamentary plasma in high-speed airflow. Major specific properties of this type of discharge are realized due to a strong coupling of the plasma to the moving gas. The plasma, supplied by a DC voltage waveform, demonstrates a pulse...
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Veröffentlicht in: | Experiments in fluids 2017-04, Vol.58 (4), p.1-17, Article 25 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A Quasi-DC (Q-DC) electrical discharge generates a highly transient filamentary plasma in high-speed airflow. Major specific properties of this type of discharge are realized due to a strong coupling of the plasma to the moving gas. The plasma, supplied by a DC voltage waveform, demonstrates a pulsed-periodic pattern of dynamics significantly affecting the flow structure. In this study, the dynamics and plasma parameters of the Q-DC discharge are analyzed in the Supersonic Test Rig (SBR-50) at the University of Notre Dame at Mach number
M
= 2, stagnation pressure
P
0
= (0.9–2.6) × 10
5
Pa, stagnation temperature
T
0
= 300 K, unit Reynolds number
R
e
L
= 7–25 × 10
6
m
−1
, and plasma power
W
pl
= 3–21 kW. The plasma parameters are measured with current–voltage probes and optical emission spectroscopy. An unsteady pattern of interaction is depicted by high-speed image capturing. The result of the plasma-flow interaction is characterized by means of pressure measurements and schlieren visualization. It is considered that the Q-DC discharge may be employed for active control of duct-driven flows, cavity-based flow, and for effective control of shock wave–boundary layer interaction. |
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ISSN: | 0723-4864 1432-1114 |
DOI: | 10.1007/s00348-016-2295-5 |