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
Hauptverfasser: Houpt, Alec, Hedlund, Brock, Leonov, Sergey, Ombrello, Timothy, Carter, Campbell
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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.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-016-2295-5