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Mean lift generation on cylinders induced with plasma actuators

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Abstract

Bluff body flow control based on plasma actuators requires suitable strategies to attain the desired objectives. The strategy selection becomes more critical in situations where the free airstream velocity is much higher than the maximum velocity that can be produced by the flow control device. In this work, we report recent efforts to produce on a circular cylinder forces in direction transverse to the free flow. Free stream velocities considered in this work are as high as 45 m/s ((Re(O) 1 × 105), which result much higher values than the maximum velocities (about 5 m/s) usually induced by the kind of plasma actuator here considered (dielectric barrier type). Our strategy consisted on promoting asymmetries on boundary layer separation with a four electrode arrangement. In our experiments, we measured drag and lift forces and explored the effect of exciting the flow with steady and non-steady actuations. The device demonstrated authority to induce significant transverse forces and optimal frequencies resulted in all cases close to the vortex shedding frequency.

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Abbreviations

\( C_{\text{D}} = {\frac{{F_{\text{D}} }}{{\frac{1}{2}\rho U_{0}^{2} bD}}} \) :

Drag coefficient

\( C_{\text{L}} = {\frac{{F_{\text{L}} }}{{\frac{1}{2}\rho U_{0}^{2} bD}}} \) :

Lift coefficient

F L :

Lift force

F D :

Drag force

U 0 :

Free stream velocity

b :

Spanwise cylinder length

D :

Cylinder diameter

ρ:

Air density

\( \% \Updelta C_{\text{D}} \) :

\( \left( {{\frac{{C_{\text{D}}^{\text{ON}} - C_{\text{D}}^{\text{OFF}} }}{{C_{\text{D}}^{\text{OFF}} }}}} \right) \times 100 \) 

\( Re = {\frac{{U_{0} D}}{\upsilon }} \) :

Reynolds number

ν:

Air kinematics viscosity

F+ = fBM/fSD:

Non-dimensional excitation frequency

f BM :

Frequency of the unsteady plasma actuation (bursting mode)

f SD :

Vortex shedding frequency

f AC :

Frequency of the voltage generator

V AC :

Peak value of the high voltage sinusoidal waveform

U j :

Maximum of the velocity profile induced by the DBD in still air

V R :

Tangential velocity of the cylinder surface due to mechanical rotation

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Authors and Affiliations

  1. Laboratorio de Fluidodinámica, University of Buenos Aires, CONICET, Buenos Aires, Argentina

    R. Sosa & G. Artana

  2. Département Fluides, Thermique et Combustion, Institute Pprime, CNRS, University of Poitiers, ENSMA, Poitiers, France

    N. Benard & E. Moreau

Authors
  1. R. Sosa
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  2. G. Artana
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  3. N. Benard
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  4. E. Moreau
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Correspondence to R. Sosa.

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Sosa, R., Artana, G., Benard, N. et al. Mean lift generation on cylinders induced with plasma actuators. Exp Fluids 51, 853–860 (2011). https://doi.org/10.1007/s00348-011-1108-0

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