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Attachment-line, cross-flow and Tollmien–Schlichting instabilities on swept ONERA-D and Joukowski airfoils

Published online by Cambridge University Press:  23 February 2023

Euryale Kitzinger Open the ORCID record for Euryale Kitzinger [Opens in a new window] ,
Tristan Leclercq Open the ORCID record for Tristan Leclercq [Opens in a new window] ,
Olivier Marquet Open the ORCID record for Olivier Marquet [Opens in a new window] ,
Estelle Piot  and
Denis Sipp Open the ORCID record for Denis Sipp [Opens in a new window]
Euryale Kitzinger*
Affiliation:
DAAA, ONERA, University of Paris-Saclay, F-92190 Meudon, France
Tristan Leclercq
Affiliation:
DAAA, ONERA, University of Paris-Saclay, F-92190 Meudon, France
Olivier Marquet
Affiliation:
DAAA, ONERA, University of Paris-Saclay, F-92190 Meudon, France
Estelle Piot
Affiliation:
ONERA/DMPE, University of Toulouse, F-31055 Toulouse, France
Denis Sipp
Affiliation:
DAAA, ONERA, University of Paris-Saclay, F-92190 Meudon, France
*
†Email address for correspondence: [email protected]
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Abstract

Linear stability analyses are performed to investigate the boundary layer instabilities developing in an incompressible flow around the whole leading-edge of swept ONERA-D and Joukowski airfoils of infinite span. The stability analyses conducted in our study are global in the chordwise direction and local in the spanwise direction. A neutral curve is drawn at a given leading-edge Reynolds number $Re_R$ and several overlapping regions, called ‘lobes’, are identified on a physical basis. A detailed study of the marginal modes reveals the presence of attachment-line and cross-flow instabilities, as well as modes whose features do not fall within the standards of a specific type. Connected cross-flow/Tollmien–Schlichting modes, that show a dominant spatial structure reminiscent of Tollmien–Schlichting waves but whose destabilization is linked to a cross-flow mechanism, have been identified. The comparison of several neutral curves at different $Re_R$ values reveals the greater stabilizing effect of the increase of $Re_R$ on the cross-flow instability compared with the attachment-line instability. The influence of the airfoil shape is also studied by comparing the neutral curves of the ONERA-D with the neutral curves of the Joukowski airfoil. These curves reveal similar characteristics with the presence of distinct lobes and their comparison at constant sweep angle shows that, under the conditions studied, the ONERA-D airfoil is more stable than the Joukowski airfoil, even for cross-flow instabilities. The absolutely or convectively unstable nature of the flow in the spanwise direction is also tackled and our results suggest that the flow is only convectively unstable.

JFM classification

Boundary Layers: Boundary layer stability
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 957 , 25 February 2023 , A29
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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