<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The methodology of efficiency analysis of turbulent flow modification by making permeable sections in the streamlined wing surface with the aim to reduce aerodynamic drag is the principal subject of the presented research. The numerical analysis of the effect of laterally and longitudinally located permeable sections on boundary-layer properties showed the following flow features: (1) the most effective place for permeable surface is an upwind side of the wing; (2) multi-sectional blowing can simply be organised as non-uniform (especially in the case of laterally arranged permeable sections) that brings additional flexibility to change the blowing intensity depending on flight mode and, first of all, on angle of attack; and (3) arrays of longitudinal permeable sections allow to intensify turbulent vortical structures exchange in the lateral direction and improve flow stability to stall. Moreover, due to creating the regular anisotropy of the boundary layer in the lateral direction, this modified blowing technique can potentially have some synergistic properties, which can give the additional benefit. All these effects are too delicate and their experimental study cannot be performed with the use of directed measurements of aerodynamic forces. The comparison of the obtained flow properties with the corresponding experimental data demonstrates an appropriate level of agreement.</p>
</abstract>

The methodology of efficiency analysis of turbulent flow modification by making permeable sections in the streamlined wing surface with the aim to reduce aerodynamic drag is the principal subject of the presented research. The numerical analysis of the effect of laterally and longitudinally located permeable sections on boundary-layer properties showed the following flow features: (1) the most effective place for permeable surface is an upwind side of the wing; (2) multi-sectional blowing can simply be organised as non-uniform (especially in the case of laterally arranged permeable sections) that brings additional flexibility to change the blowing intensity depending on flight mode and, first of all, on angle of attack; and (3) arrays of longitudinal permeable sections allow to intensify turbulent vortical structures exchange in the lateral direction and improve flow stability to stall. Moreover, due to creating the regular anisotropy of the boundary layer in the lateral direction, this modified blowing technique can potentially have some synergistic properties, which can give the additional benefit. All these effects are too delicate and their experimental study cannot be performed with the use of directed measurements of aerodynamic forces. The comparison of the obtained flow properties with the corresponding experimental data demonstrates an appropriate level of agreement.

Various Blowing-Suction Schemes for Manipulating Turbulent Boundary Layers

Transactions on Aerospace Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Various Blowing-Suction Schemes for Manipulating Turbulent Boundary Layers"}

The methodology of efficiency analysis of turbulent flow modification by making permeable sections in the streamlined wing surface with the aim to reduce...

Various Blowing-Suction Schemes for Manipulating Turbulent Boundary Layers

Article Category: research article

Published Online: Mar 13, 2024

Page range: 19 - 28

Received: Feb 04, 2022

Accepted: Jan 08, 2024

DOI: https://doi.org/10.2478/tar-2024-0002

Keywords
combined flow control, drag reduction, blowing, suction, numerical flow modelling, RANS, experimental data analysis

© 2024 Yevhenii Shkvar et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Fig. 7.

Various Blowing-Suction Schemes for Manipulating Turbulent Boundary Layers

Article Category: research article

Published Online: Mar 13, 2024

Page range: 19 - 28

Received: Feb 04, 2022

Accepted: Jan 08, 2024

DOI: https://doi.org/10.2478/tar-2024-0002

Keywordscombined flow control, drag reduction, blowing, suction, numerical flow modelling, RANS, experimental data analysis

© 2024 Yevhenii Shkvar et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Fig. 5.

Fig. 6.

Fig. 7.

Keywords
combined flow control, drag reduction, blowing, suction, numerical flow modelling, RANS, experimental data analysis