caa a22 4500 606198326 CHVBK 20210128100933.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00348-015-1939-1 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1939-1 Dielectric barrier discharge plasma actuator to control turbulent flow downstream of a backward-facing step [Elektronische Daten] [P. Sujar-Garrido, N. Benard, E. Moreau, J. Bonnet] The objective of these experiments was to determine the optimal forcing location and unsteady forcing actuation produced by a single dielectric barrier discharge plasma actuator for controlling the flow downstream of a backward-facing step. The investigated configuration is a 30-mm-height step mounted in a closed-loop wind tunnel. The flow velocity is fixed at 15m/s, corresponding to a Reynolds number based on the step height equal to 3×104 (Re θ =1400). The control authority of the plasma discharge is highlighted by the time-averaged modification of the reattachment point and by the effects obtained on the turbulent dynamics of the reattached shear layer. Several locations of the device actuator are considered, and a parametric study of the input signal is investigated for each location. This procedure leads to the definition of an optimal control configuration regarding the minimization of the reattachment length. When the actuator—that produces an electrohydrodynamic force resulting in an electric wind jet—is located upstream the separation point, it can manipulate the first stages of the formation of the turbulent free shear layer and consequently to modify the flow dynamics. Maximum effects have been observed when the high voltage is burst modulated at a frequency f BM=125Hz with a duty-cycle of 50%. This forcing corresponds to a Strouhal number based on the momentum thickness equal to 0.011, a value corresponding to the convective instability or Kelvin-Helmholtz instability of the separated shear layer. Springer-Verlag Berlin Heidelberg, 2015 Sujar-Garrido P. CNRS UPR 3346, Institut PPRIME, ISAE-ENSMA, Université de Poitiers, Futuroscope, France aut Benard N. CNRS UPR 3346, Institut PPRIME, ISAE-ENSMA, Université de Poitiers, Futuroscope, France aut Moreau E. CNRS UPR 3346, Institut PPRIME, ISAE-ENSMA, Université de Poitiers, Futuroscope, France aut Bonnet J. CNRS UPR 3346, Institut PPRIME, ISAE-ENSMA, Université de Poitiers, Futuroscope, France aut Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-16 0723-4864 56:4<1 2015 56 348 https://doi.org/10.1007/s00348-015-1939-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1939-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sujar-Garrido P. CNRS UPR 3346, Institut PPRIME, ISAE-ENSMA, Université de Poitiers, Futuroscope, France aut NATIONALLICENCE 700 1- Benard N. CNRS UPR 3346, Institut PPRIME, ISAE-ENSMA, Université de Poitiers, Futuroscope, France aut NATIONALLICENCE 700 1- Moreau E. CNRS UPR 3346, Institut PPRIME, ISAE-ENSMA, Université de Poitiers, Futuroscope, France aut NATIONALLICENCE 700 1- Bonnet J. CNRS UPR 3346, Institut PPRIME, ISAE-ENSMA, Université de Poitiers, Futuroscope, France aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-16 0723-4864 56:4<1 2015 56 348