Print Email Facebook Twitter Airfoil flow separation control with plasma synthetic jets at moderate Reynolds number Title Airfoil flow separation control with plasma synthetic jets at moderate Reynolds number Author Zong, H. (TU Delft Aerodynamics) van Pelt, T. (TU Delft Electrical Engineering, Mathematics and Computer Science) Kotsonis, M. (TU Delft Aerodynamics) Faculty Electrical Engineering, Mathematics and Computer Science Date 2018-11-01 Abstract Abstract: An array of 26 plasma synthetic jet actuators (PSJA) is flush-mounted on a NACA-0015 airfoil model to control the leading-edge flow separation at moderate Reynolds number (Rec= 1.7 × 10 5). The stall angle of this airfoil is postponed from 15. 5 ∘ to approximately 22 ∘, and the peak lift coefficient is increased by 21%. PSJAs exhibit distinctive separation control mechanisms depending on the relative location between actuation and separation and reduced frequency of actuation (F∗). At an angle of attack of α= 15. 5 ∘, the non-actuated flow separates approximately 4 % chord length downstream of the jet orifices. Plasma synthetic jets (PSJs) applied at F∗≥ 0.5 can displace the separation point downstream to mid-chord position, as a result of the energizing of the incoming boundary layer through mixing enhancement. As a comparison, with actuation frequency of F∗≤ 0.25 , the separation point at α= 15. 5 ∘ remains near the leading edge and the zero-velocity line is periodically swept towards the suction surface by the convecting spanwise vortices generated from PSJ actuation, leading to a reduction of time-averaged backflow area. For the case of separation control at α= 22 ∘, the separation point resides always upstream of the actuation position, regardless of actuation frequency. The peak lift coefficient is attained at F∗= 1 , and the decreasing lift at high actuation frequency (F∗= 2) is ascribed to the severe interaction between adjacent spanwise vortices at short spacing. Graphical abstract: [Figure not available: see fulltext.]. To reference this document use: http://resolver.tudelft.nl/uuid:d4011960-ebb9-4457-8318-62bb159280d0 DOI https://doi.org/10.1007/s00348-018-2624-y ISSN 0723-4864 Source Experiments in Fluids: experimental methods and their applications to fluid flow, 59 (11) Part of collection Institutional Repository Document type journal article Rights © 2018 H. Zong, T. van Pelt, M. Kotsonis Files PDF 10.1007_s00348_018_2624_y.pdf 7.57 MB Close viewer /islandora/object/uuid:d4011960-ebb9-4457-8318-62bb159280d0/datastream/OBJ/view