Experimental detection of flow separation over a plain flap by wall shear stress analysis with and without steady blowing

Timothée Chabert; Julien Dandois; Éric Garnier; Laurent Jacquin

doi:10.1016/j.crme.2014.01.013

Separation flow control

Experimental detection of flow separation over a plain flap by wall shear stress analysis with and without steady blowing

Timothée Chabert ¹ ; Julien Dandois ¹; Éric Garnier ¹; Laurent Jacquin ¹

¹ Onera – The French Aerospace Lab, 8, rue des Vertugadins, 92190 Meudon, France

Comptes Rendus. Mécanique, Flow separation control, Volume 342 (2014) no. 6-7, pp. 389-402.

Abstract
Résumé

The present article deals with the flow separation detection over a plain flap at a Reynolds number of $2 \cdot 10^{6}$ by the analysis of the wall shear stress fluctuations. Natural flow separation is first considered with the study of the evolution of wall shear stress fluctuations measured along the flap chord when the flap deflection angle is progressively increased. Then, steady blowing is applied and its effect on wall shear stress fluctuations is analysed. For both controlled and uncontrolled cases, flow separation criteria are defined, studied and compared.

Cet article traite de la détection du décollement de l'écoulement sur un volet sans fente pour un nombre de Reynolds de $2 \cdot 10^{6}$ par l'analyse des fluctuations du frottement pariétal. On considère en premier lieu le décollement naturel à travers l'étude de l'évolution des fluctuations de frottement pariétal mesurées sur la corde du volet lorsque son angle de braquage augmente progressivement. Par la suite, un contrôle par soufflage continu est appliqué et l'effet de ce contrôle sur les fluctuations de frottement pariétal est étudié. Dans les cas contrôlé et non contrôlé, des critères de décollement sont définis, étudiés et comparés entre eux.

Received: 2013-09-02
Accepted: 2014-01-27
Published online: 2014-06-01

DOI: 10.1016/j.crme.2014.01.013

Keywords: Flow separation, Flow control, Flap, Steady blowing
Mots-clés : Décollement, Contrôle des écoulements, Volet, Soufflage continu

Author's affiliations:

Timothée Chabert ¹; Julien Dandois ¹; Éric Garnier ¹; Laurent Jacquin ¹

¹ Onera – The French Aerospace Lab, 8, rue des Vertugadins, 92190 Meudon, France

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     author = {Timoth\'ee Chabert and Julien Dandois and \'Eric Garnier and Laurent Jacquin},
     title = {Experimental detection of flow separation over a plain flap by wall shear stress analysis with and without steady blowing},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {389--402},
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     volume = {342},
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     year = {2014},
     doi = {10.1016/j.crme.2014.01.013},
     language = {en},
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Timothée Chabert; Julien Dandois; Éric Garnier; Laurent Jacquin. Experimental detection of flow separation over a plain flap by wall shear stress analysis with and without steady blowing. Comptes Rendus. Mécanique, Flow separation control, Volume 342 (2014) no. 6-7, pp. 389-402. doi : 10.1016/j.crme.2014.01.013. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2014.01.013/

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