Effect of electrical discharge on separation processes and shocks position in supersonic airflow

Leonov, Sergey B.; Bityurin, V. A.; Savelkin, Konstantin; Yarantsev, Dmitry

doi:10.2514/6.2002-355

Cited by 57 publications

(33 citation statements)

References 2 publications

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“…The power input in these discharges is a few kilowatts and is much higher than in glows. For these arc discharges, the static pressure over the wall surface in the immediate vicinity of the discharge was measured and static pressure increases owing to the plasma discharges were found to be insignificant [6]. Similar pressure measurements were conducted by Menart et al [3] whose results provide the same conclusions.…”

Section: Introductionsupporting

confidence: 70%

“…Operating at higher powers resulted in a constricted discharge mode that was found to be relatively ineffective in flow actuation. For conditions under which the diffuse mode d glow discharge is not stable (higher pressures and higher powers), flow actuation is more effectively achieved at much higher powers (kWs) where filamentary arcs are generated [6]. …”

Section: DC Plasma Discharge In Mach 285 Flowmentioning

confidence: 99%

“…Flow actuation by large power deposition using filamentary arcs has been explored by Leonov et al [6]. They used an array of small radius electrodes with input currents as high as 1-5 A at input voltages of several kilovolts.…”

Section: Introductionmentioning

confidence: 99%

“…T HERE is much recent interest in plasma-based localized aerodynamic flow actuation using single dielectric-barrier discharges (DBD) [1,2], direct-current (DC) glow discharges [3][4][5], DC filamentary discharges [6,7], and RF discharges [8]. The use of plasmas for flow-control applications is particularly promising owing to the potential for achieving high-bandwidth actuation without moving mechanical parts.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a Direct-Current Glow Discharge Plasma Actuator in Low-Pressure Supersonic Flow

et al. 2007

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An experimental study of a direct-current, nonequilibrium glow plasma discharge in the presence of a Mach 2.85 supersonic flow is presented. The discharge is generated with pinlike electrodes flush-mounted on a plane surface with sustaining currents between 25 to 300 mA. In the presence of a supersonic flow, two distinct discharge modes (diffuse and constricted) are observed depending on the flow and discharge operating conditions. The effect of the discharge on the flow ("plasma actuation") is characterized by the appearance of a weak shock wave in the vicinity of the discharge. The shock is observed at low powers (10 W) for the diffuse discharge mode but is absent for the higher power (100 W) constricted mode. High-speed laser schlieren imaging suggests that plasma actuation is rapid as it occurs on a time scale that is less than 220 s. Rotational (gas) and vibrational temperature within the discharge are estimated by emission spectral line fits of N 2 and N 2 rovibronic bands near 365-395 nm. The electronic temperatures are estimated by using the Boltzmann plot method for Fe(I) atomic lines. Rotational temperatures are found to be high (1500 K) in the absence of a flow but drop sharply (500 K) in the presence of a supersonic flow for both the diffuse and constricted discharge modes. The vibrational and electronic temperatures are measured to be about 3000 K and 1.25 eV, respectively, and these temperatures are the same with and without flow. The gas temperature spatial profiles above the cathode surface are similar for the diffuse and constricted modes indicating that dilatational effects due to gas heating are similar. However, complete absence of flow actuation as indicated visually by the shock indicates that electrostatic forces may also play an important role in high-speed plasma-flow actuation phenomena. Analytical estimates using cathode sheath theory indicate that ion pressure within sheath can be significant, resulting in gas compression within sheath and a corresponding expansion above it. The expansion, in turn, may fully negate the dilatational effect in the constricted case resulting in an apparent absence of forcing in the constricted case.

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Section: Introductionsupporting

confidence: 70%

Section: DC Plasma Discharge In Mach 285 Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of a Direct-Current Glow Discharge Plasma Actuator in Low-Pressure Supersonic Flow

et al. 2007

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“…Leonov et al [9] investigated flow actuation at pressures ∼50-300 Torr with freestream Mach numbers 0.5-1.2 using plasma arcs. The typical electrical parameters in the experiment were power ∼1-10 kW, and currents of few amperes.…”

Section: 11mentioning

confidence: 99%