Numerical investigation of active flow control using zero-net-mass-flux jets around a high-lift morphing cambered wing-flap system
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 10 March 2023
Issue publication date: 24 April 2023
Abstract
Purpose
This study aims to investigate the physical mechanisms of the use of active flow control (AFC) for a high-lift wing-flap configuration.
Design/methodology/approach
By means of high-fidelity numerical simulations, the flow dynamics around a high-lift wing-flap system at high Reynolds number (Re/c = 4.6 million) is studied. Adapted turbulence models based on the URANS approach are used to capture the flow separation and the subsequent development of coherent structures. The present study focuses on the use of AFC using a synthetic jet known as zero-net-mass-flux (ZNMF) using the blowing–suction approach. Different parameters (geometry, frequency and velocity) of a ZNMF placed at the cambered flap’s chord are optimized to obtain the most efficient parameter settings to suppress the flow separation.
Findings
A synthetic jet with the optimal shape and orientation enforces the flow reattachment on the wing-flap surface. This leads to an improvement of the aerodynamic performance of the system. The wake thickness was reduced by 30%, and an increase of 17.6% in lift-to-drag ratio was obtained. Concerning the ZNMF location, they should be installed upstream of the separation point to achieve the best performance.
Originality/value
The effectiveness of ZNMF devices integrated on a high-lift wing-flap configuration was studied in real flight conditions at high Reynolds number. A detailed analysis of the wake dynamics explains how AFC forces the reattachment of the boundary layer and attenuates the predominant wake instabilities up to −20 dB.
Keywords
Acknowledgements
The results presented in this paper were obtained in the H2020 project SMS (funded by the European Union H2020 research and innovation framework program under Grant Agreement 723402) and the CleanSky2 project AFC4TR (funded by the European Union H2020 program under Grant Agreement 886718). This work was granted access to the HPC resources of [CINES/IDRIS/TGCC] under the allocation 2020-2021-2022-[A0102A11355] made by GENCI and HPC Strasbourg.
Citation
Truong, H., Marouf, A., Gehri, A., Vos, J., Braza, M. and Hoarau, Y. (2023), "Numerical investigation of active flow control using zero-net-mass-flux jets around a high-lift morphing cambered wing-flap system", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33 No. 4, pp. 1475-1488. https://doi.org/10.1108/HFF-09-2022-0558
Publisher
:Emerald Publishing Limited
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