The effect of a nonequilibrium RF discharge plasma on a conical shock wave in a M = 2.5 flow

Meyer, R.; Palm, Peter; Plönjes, Elke; Rich, John Martin; Adamovich, Igor V.

doi:10.2514/6.2001-3059

Cited by 18 publications

(9 citation statements)

References 10 publications

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“…There have also been studies done with plasma flow control in high-speed applications [11,14,15,16,17,18,19,20,21] . Plasma was generated in numerous ways including DC, AC, RF, microwave, arc, corona, and spark electric discharges, as well as laser induced breakdown, and applied to subsonic and supersonic flow regimes.…”

Section: Introductionmentioning

confidence: 98%

Transient Plasma Impact on Spectra of Flow Disturbances in a Corner Separation Zone at Mach 4.5

Houpt

Hedlund

Gordeyev

et al. 2016

47th AIAA Plasmadynamics and Lasers Conference

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This work was performed to study the effect on flow disturbances in the corner separation zone of a compression surface with a hypersonic boundary layer caused by a weakly ionized transient plasma generated upstream. Schlieren imaging was used to distinguish the corner separation zone for 15°, 20°, and 25° compression ramps at Mach 4.5 (nozzle exit). A Shack-Hartmann wavefront sensor was used to determine the dominant frequencies of flow oscillations at different locations in the flow field and the resulting effect of repetitively pulsed plasma actuators. A significant rise in amplitudes of high-frequency (>80 kHz) flow perturbations was found when pulsing the plasma at a frequency (100 kHz) higher than the natural dominant frequency of the boundary layer (~65 kHz). The plasma effect was negligible when operated below this frequency (50 kHz). PCB pressure sensors were used to determine the dominant frequencies of pressure oscillations present at the surface on the flat plate and compression ramp inside the separation zone. This technique can potentially be used for active control of the boundary layer condition and supersonic flow structure on the compression surface.

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Section: Introductionmentioning

confidence: 98%

Transient Plasma Impact on Spectra of Flow Disturbances in a Corner Separation Zone at Mach 4.5

Houpt

Hedlund

Gordeyev

et al. 2016

47th AIAA Plasmadynamics and Lasers Conference

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“…The experiments have been conducted at the supersonic nonequilibrium plasma wind tunnel facility at Nonequilibrium Thermodynamics Group. This facility generates stable, diffuse supersonic flows of nonequilibrium plasmas at M=2-4, with run durations from tens of seconds to complete steady state [10][11][12]. Previously, the plasma wind tunnel has been used for studies of shock wave modification by nonequilibrium plasmas [10][11][12].…”

Section: Methodsmentioning

confidence: 99%

“…The electrical conductivity of the flow can be considerably increased by raising the RF power. In our previously plasma wind tunnel experiments [11,12], the stable RF discharge in M=2-3 flows was sustained at RF powers up to 300 W.…”

Section: Methodsmentioning

confidence: 99%

Feasibility study of MHD control of cold supersonic plasma flows

Palm

Meyer²,

Bezant³

et al. 2002

40th AIAA Aerospace Sciences Meeting &Amp; Exhibit

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The paper presents preliminary results of an experimental study of MHD effects in lowtemperature ionized supersonic flows. The main objective was to determine whether the Lorentz force produced in nonequilibrium plasmas can affect the supersonic flow separation and the intensity of turbulent fluctuations in the supersonic boundary layer. The results show that a combination of the transverse RF and transverse non-self-sustained DC discharges can be used for generation of stable ionization in supersonic flows and for sustaining transverse current to produce Lorentz force in the presence of the magnetic field. The results also show that plasma flow visualization can be used for straightforward diagnostics of separation of low-temperature supersonic MHD flows. Finally, the results show applicability of the use of miniature microphones for measurements of pressure fluctuations spectra in low-temperature supersonic plasma flows in the presence of electric and magnetic fields. The results have not shown any detectable effect of the Lorentz force on the supersonic flow separation or on the pressure fluctuation spectra since these preliminary measurements have been done at the fairly low electrical conductivity and transverse DC currents.

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“…Another group of plasma-related studies is focused on high-speed applications [12][13][14][15][16][17]. Various methods of plasma generation, including DC, AC, RF, microwave, arc, corona, and spark electric discharges, as well as laser-induced breakdown, have been used to modify both subsonic and supersonic flow fields.…”

Section: Introduction / Motivationmentioning

confidence: 99%

Control of Hypersonic BL Transition by Electrical Discharge (feasibility study)

Leonov¹,

Falempin²

2015

20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference

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This paper presents experimental data characterizing the microsecond-scale electric discharge in hypersonic airflow. The tests are performed to prove the feasibility of such a discharge application to control the boundary layer (BL) at low static pressures in terms of transition and separation. Discharge developments are analyzed using electrical measurements, synchronized gate camera imaging, and a schlieren visualization. The results demonstrate that a shallow-cavity plasma actuator may be used for the BL tripping with a frequency F>100kHz even at static pressure Pst<5Torr.

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The effect of a nonequilibrium RF discharge plasma on a conical shock wave in a M = 2.5 flow

Cited by 18 publications

References 10 publications

Transient Plasma Impact on Spectra of Flow Disturbances in a Corner Separation Zone at Mach 4.5

Transient Plasma Impact on Spectra of Flow Disturbances in a Corner Separation Zone at Mach 4.5

Feasibility study of MHD control of cold supersonic plasma flows

Control of Hypersonic BL Transition by Electrical Discharge (feasibility study)

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