Flow Around Wing Model with a Surface HF Discharge

Климов, А. И.; Moralev, I. A.; Bityurin, V. A.; Kazansky, Pavel; Chertov, Denis; Борисов, И. И.

doi:10.2514/6.2011-1146

Cited by 3 publications

(6 citation statements)

References 7 publications

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“…Leading edge separation on a wing model was studied at V=20m/s in our previous work [14]. It was revealed that discharge can delay the flow separation at attack angles larger than the stall one.…”

Section: B Pressure Measurementsmentioning

confidence: 99%

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Flow Separation Control near NACA23012 airfoil by a Capacity Coupled Surface HF Discharge

Moralev

Климов

Bityurin

et al. 2011

42nd AIAA Plasmadynamics and Lasers Conference

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Flow separation control on a wing model by surface pulsed repetitive capacity coupled HF discharge (CHFD) is studied. The typical parameters of CHFD used in these experiments are the followings: -HF frequency f HF~3 50 kHz, modulation frequency F M =10-10 4 Hz, mean HF power N HF < 100W. Airflow parameters are the followings: airflow velocity up to 140 m/s, Re < 6x10 5 . Significant aerodynamic drag decrease is obtained at definite CHFD parameters. Drag decrease of about 40% is measured for a wing model at M~0.3, Re~3x10 5 and HF plasma. This result is obtained at post-stall angles of attack (AoA). It is revealed, that HF plasma actuator effectiveness drops significantly at stall attack angle and Re > 4x10 5 . This result is connected with a boundary layer turbulisation near the leading edge of a wing model probably. PIV flow visualization of the flow reattachment process is performed. Nomenclature HF= high frequency CHFD = capacity coupled high frequency discharge f HF = HF career frequency F M = modulation frequency of CHFD T i = pulse duration N HF = pulse power input in plasma M =Mach number V af = airflow velocity P 0 = stagnation pressure P st = static pressure T g = gas temperature Sh = Strouchal's number

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Section: B Pressure Measurementsmentioning

confidence: 99%

“…Series of vortical structures at pulse-periodic discharge operation was obtained by PIV in [13]. Same structures appear at SHFD forcing [14].…”

Section: Introductionmentioning

confidence: 99%

Flow Separation Control near NACA23012 airfoil by a Capacity Coupled Surface HF Discharge

Moralev

Климов

Bityurin

et al. 2011

42nd AIAA Plasmadynamics and Lasers Conference

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“…Compared with DBD, RF discharge has advantages, such as stable volume discharge in high-speed airflow, and simple power tuning, which has drawn increasing attention for its potential application on both low and high speed flow control. [8][9][10][11][12][13] Leonov et al experimentally and theoretically investigated the dynamics of a single-electrode RF filament in supersonic airflow by means of optical emission spectrum and Schlieren visualization. It is revealed that the gas temperature in filamentary RF plasma can reach up to 4000 K at a static pressure of 120 Torr.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental results showed that surface RF discharge consists of many plasma filaments, which increase the surface pressure and decrease the stagnation pressure. [9,10] Bityurin et al presented experimental and numerical results of the surface RF discharge at a conical body in airflow. Significant flow modification has been achieved between Mach number 0.5-2.0.…”

Section: Introductionmentioning

confidence: 99%

Electric and plasma characteristics of RF discharge plasma actuation under varying pressures

et al. 2016

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The electric and plasma characteristics of RF discharge plasma actuation under varying pressure have been investigated experimentally. As the pressure increases, the shapes of charge-voltage Lissajous curves vary, and the discharge energy increases. The emission spectra show significant difference as the pressure varies. When the pressure is 1000 Pa, the electron temperature is estimated to be 4.139 eV, the electron density and the vibrational temperature of plasma are 4.71×10 11 cm −3 and 1.27 eV, respectively. The ratio of spectral lines I peak 391.4 /I peak 380.5 which describes the electron temperature hardly changes when the pressure varies between 5000-30000 Pa, while it increases remarkably with the pressure below 5000 Pa, indicating a transition from filamentary discharge to glow discharge. The characteristics of emission spectrum are obviously influenced by the loading power. With more loading power, both of the illumination and emission spectrum intensity increase at 10000 Pa. The pin-pin electrode RF discharge is arc-like at power higher than 33 W, which results in a macroscopic air temperature increase.

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“…Examples include dielectric-barrier discharge, glow discharge, and arc discharge [18]. Dielectric-barrier discharge (DBD) plasma actuators are driven by AC input at several kHz and are the most commonly used in low-speed flows [19][20][21][22][23][24][25][26]. However, the actuation effect of DBD actuators generally produces asymmetric forcing due to the oscillatory power input [27].…”

Section: Introductionmentioning

confidence: 99%

Flow Actuation by DC Surface Discharge Plasma Actuator in Different Discharge Modes

Kim¹,

Shin²

2015

International Journal of Aeronautical and Space Sciences

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Aerodynamic flow control phenomena were investigated with a low-current DC surface discharge plasma actuator. The plasma actuator was found to operate in three different discharge modes with similar discharge currents of about 1 mA or less. Stable continuous DC discharge without audible noise was obtained at higher ballast resistances and lower discharge currents. However, even with continuous DC power input, a low-frequency self-pulsed discharge was obtained at lower ballast resistances, and a high-frequency self-pulsed discharge was obtained at higher set-point currents and higher ballast resistances, both with audible noise. The Schlieren image reveals that the low-frequency self-pulsed mode produces a synthetic jet-like flow implying that a gas heating effect plays a role, even though the discharge current is small. The highfrequency self-pulsed mode produces pulsed jets in a tangent direction, and the continuous DC mode produces a steady straight pressure wave. Particle image velocimetry (PIV) images reveal that the induced flow field by the low-frequency selfpulsed mode has flow propagating in the radial direction and centered between the electrodes. The high-frequency selfpulsed mode and continuous DC mode produce flow from the anode to the cathode. The perturbed region downstream of the cathode is larger in the high-frequency self-pulsed mode with similar maximum speeds.

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Flow Around Wing Model with a Surface HF Discharge

Cited by 3 publications

References 7 publications

Flow Separation Control near NACA23012 airfoil by a Capacity Coupled Surface HF Discharge

Flow Separation Control near NACA23012 airfoil by a Capacity Coupled Surface HF Discharge

Electric and plasma characteristics of RF discharge plasma actuation under varying pressures

Flow Actuation by DC Surface Discharge Plasma Actuator in Different Discharge Modes

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