| Titre : |
Contrôle de la couche limite laminaire d’un écoulement stationnaire, visqueux, compressible et subsonique autour d’un profil bidimensionnel |
| Type de document : |
texte imprimé |
| Auteurs : |
Azzeddine Nahoui, Auteur ; Lakhdar Bahi, Directeur de thèse |
| Editeur : |
جامعة الإخوة منتوري قسنطينة |
| Année de publication : |
2018 |
| Importance : |
116 f. |
| Format : |
30 cm. |
| Note générale : |
2 copies imprimées disponibles
|
| Langues : |
Français (fre) |
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
Couche limite laminaire compressible nombre de Mach nombre de Reynolds contrôle point de séparation aspiration soufflage refroidissement pariétal Laminar boundary layer Mach number Reynolds number control separation point suction blowing wall cooling طبقة حدية رقائقية انضغاطي عدد ماخ عدد رينولدز مراقبة نقطة الانفصال الامتصاص النفخ والتبريد السطحي |
| Index. décimale : |
530 Physique |
| Résumé : |
A numerical study of a laminar boundary layer of a stationary, viscous, compressible and subsonic flow around a two-dimensional NACA profile was conducted without and with control.
The flow domain has been divided into two zones, one near-wall, the boundary layer, which is responsible for friction phenomena, and the other, an external zone where flow is considered potential.
The potential flow is studied by the panel method for the determination of the external velocity distribution necessary for the treatment of the boundary layer.
The boundary layer was studied using the PRANDTL model and the KELLER method by reducing the order of the first-order differential equations, the writing of the algebraic equations, and the linearization by the Newton method via an iterative calculation process and finally the resolution by the method of elimination by blocks.
The distributions of the pressure and lift coefficients were determined and examined for different Mach numbers and different angles of attack with varying relative thickness.
Thermal control by wall heating or wall cooling was studied and the results demonstrated only the effectiveness of the wall cooling control on the recoil of the separation point around 10% of the chord of the profile.
The dynamic control by suction or blowing has demonstrated its effectiveness on the decline of the separation point; the decline has reached 10% of the chord of the profile.
The superimposition of the thermal and dynamic control procedures demonstrated once again more efficiency on the retreat of the boundary layer separation point with a gain of 15% of the chord of the profile.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/physique/NAH7251.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10843 |
Contrôle de la couche limite laminaire d’un écoulement stationnaire, visqueux, compressible et subsonique autour d’un profil bidimensionnel [texte imprimé] / Azzeddine Nahoui, Auteur ; Lakhdar Bahi, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 116 f. ; 30 cm. 2 copies imprimées disponibles
Langues : Français ( fre)
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
Couche limite laminaire compressible nombre de Mach nombre de Reynolds contrôle point de séparation aspiration soufflage refroidissement pariétal Laminar boundary layer Mach number Reynolds number control separation point suction blowing wall cooling طبقة حدية رقائقية انضغاطي عدد ماخ عدد رينولدز مراقبة نقطة الانفصال الامتصاص النفخ والتبريد السطحي |
| Index. décimale : |
530 Physique |
| Résumé : |
A numerical study of a laminar boundary layer of a stationary, viscous, compressible and subsonic flow around a two-dimensional NACA profile was conducted without and with control.
The flow domain has been divided into two zones, one near-wall, the boundary layer, which is responsible for friction phenomena, and the other, an external zone where flow is considered potential.
The potential flow is studied by the panel method for the determination of the external velocity distribution necessary for the treatment of the boundary layer.
The boundary layer was studied using the PRANDTL model and the KELLER method by reducing the order of the first-order differential equations, the writing of the algebraic equations, and the linearization by the Newton method via an iterative calculation process and finally the resolution by the method of elimination by blocks.
The distributions of the pressure and lift coefficients were determined and examined for different Mach numbers and different angles of attack with varying relative thickness.
Thermal control by wall heating or wall cooling was studied and the results demonstrated only the effectiveness of the wall cooling control on the recoil of the separation point around 10% of the chord of the profile.
The dynamic control by suction or blowing has demonstrated its effectiveness on the decline of the separation point; the decline has reached 10% of the chord of the profile.
The superimposition of the thermal and dynamic control procedures demonstrated once again more efficiency on the retreat of the boundary layer separation point with a gain of 15% of the chord of the profile.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/physique/NAH7251.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10843 |
|
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