Effect of Surface Plasma Discharges on Boundary Layers at Mach 5

Kimmel, Roger L.; Hayes, J.; Menart, James; Shang, J. S.

doi:10.2514/6.2004-509

Cited by 44 publications

(40 citation statements)

References 14 publications

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“…7c, the shock is observed to be present for images with the discharge in mode d and absent for images with discharge in mode c, indicating that for all conditions it is necessary for the discharge to remain in the relatively low power (10 W) diffuse mode d rather than the higher power (100 W) constricted mode c to produce a visible effect of plasma-flow actuation. This observation is also consistent with surface pressure measurements of Kimmel et al [5], who found that an increase of surface pressure just downstream of the cathode was much higher in the case of a lowcurrent diffuse discharge compared with a more constricted discharge at higher currents. Our observations were highly repeatable and were confirmed through multiple experimental runs.…”

Section: DC Plasma Discharge In Mach 285 Flowsupporting

confidence: 82%

“…Our observations were highly repeatable and were confirmed through multiple experimental runs. Therefore, based on our schlieren imaging evidence of a shock emerging from the discharge region and consistent observations on the surface pressures measured by Kimmel et al [5], we take the visible weak shock as measure of the effectiveness of plasma-flow interaction. We must also note that generation of discharge-induced flow actuation (discernible as shocks originating at the discharge location) has, however, been reported at much higher power (a few kilowatts) in filamentary arcs [22] where gas temperatures are high and dilatation effects are expected to be the only dominant mechanism of flow actuation in the absence of magnetic fields [5].…”

Section: DC Plasma Discharge In Mach 285 Flowmentioning

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%

“…Magnetic fields can potentially be applied to increase the effectiveness of plasma discharge by imposing a Lorentz force on the ionized flow. The effect of Lorentz forcing of a supersonic flow by an imposed magnetic field was explored recently, but even in this situation dilatation effects due to gas heating was shown to be the primary mechanism of flow actuation [5].…”

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: DC Plasma Discharge In Mach 285 Flowsupporting

confidence: 82%

Section: DC Plasma Discharge In Mach 285 Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2007

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“…His work was complemented by the numerical studies of El-Khabiry and Colver. 16 Recently Léger et al 17 and Kimmel et al 18 investigated and demonstrated the ability of corona discharges to reduce drag using electrodes perpendicular to the flow and either flush or in contact with a flat plate.…”

Section: Introductionmentioning

confidence: 99%

Ionic winds for locally enhanced cooling

Garimella

Fisher

et al. 2007

Journal of Applied Physics

155

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Ionic wind engines can be integrated onto surfaces to provide enhanced local cooling. Air ions generated by field-emitted electrons or a corona discharge are pulled by an electric field and exchange momentum with neutral air molecules, causing air flow. In the presence of a bulk flow, ionic winds distort the boundary layer, increasing heat transfer from the wall. Experiments demonstrate the ability of ionic winds to decrease the wall temperature substantially in the presence of a bulk flow over a flat plate, corresponding to local enhancement of the heat transfer coefficient by more than twofold. Multiphysics simulations of the corona and flow describe the ability of the ionic wind to distort a bulk flow boundary layer and confirm the experimentally observed heat transfer enhancement trends.

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Drift-Diffusion Model for Magneto-Fluid-Dynamics Interaction

Shang

Суржиков

Computational Fluid Dynamics 2004

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Effect of Surface Plasma Discharges on Boundary Layers at Mach 5

Cited by 44 publications

References 14 publications

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

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

Ionic winds for locally enhanced cooling

Drift-Diffusion Model for Magneto-Fluid-Dynamics Interaction

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