Print Email Facebook Twitter Experimental base flow modification on a swept wing using plasma forcing Title Experimental base flow modification on a swept wing using plasma forcing Author Peng, K. (TU Delft Aerodynamics) Arkesteijn, J. P.W. (Student TU Delft) Avallone, F. (TU Delft Wind Energy) Kotsonis, M. (TU Delft Aerodynamics) Date 2022 Abstract This work experimentally investigates plasma actuator (PA) forcing effects on the base flow and developing crossflow (CF) instabilities in a swept wing boundary layer. Spanwise-invariant plasma forcing near the leading edge is configured according to the base flow modification (BFM) strategy. A simplified predictive model is constructed by coupling an experimentally derived plasma body force and a linear stability theory and is used to infer the stability characteristics of the boundary layer subject to BFM. The base flow velocity is measured by stereo particle image velocimetry (PIV) at various PA operating conditions. Similarly, the developing CF instabilities, triggered through discrete roughness elements, are quantified by planar-PIV. The results demonstrate that a PA can reduce the boundary layer CF component, whereas the control authority shows a high dependence on the momentum coefficient. The dissimilar reduction between the streamline-aligned velocity and CF component leads to a local re-orientation of the base flow. Spanwise spectral analysis of the time-averaged flow indicates that stationary CF instabilities can be favorably manipulated whereas the BFM reduction effects depend on the corresponding initial amplitudes of stationary instabilities. An evident spanwise shift in the trajectory of stationary CF vortices is observed, which appears to result from the local alteration of the boundary layer stability due to the PA forcing. Despite the overall reduction in the amplitude of stationary CF instabilities, unsteady disturbances are found to be enhanced by the PA forcing. The current results shed light on the underlying principles of BFM-based PA operation in the context of laminar flow control. To reference this document use: http://resolver.tudelft.nl/uuid:0a19f551-36c2-4e02-9ed2-1f24611d2b9c DOI https://doi.org/10.1063/5.0118861 ISSN 1070-6631 Source Physics of Fluids, 34 (10) Part of collection Institutional Repository Document type journal article Rights © 2022 K. Peng, J. P.W. Arkesteijn, F. Avallone, M. Kotsonis Files PDF 5.0118861.pdf 3.95 MB Close viewer /islandora/object/uuid:0a19f551-36c2-4e02-9ed2-1f24611d2b9c/datastream/OBJ/view