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Boundary layer on a flat plate with suction; Couche limite sur paroi plane poreuse avec aspiration

Abstract

This research done in wind tunnel concerns the turbulent boundary layer of a porous flat plate with suction. The porous wall is 1 m long and begins 1 m downstream of the leading edge. The Reynolds number based on the boundary layer thickness is of the order of 16.300. The suction rate defined as the ratio of the velocity perpendicular to the wall to the external flow velocity ranges from 0 to 2 per cent. The pressure gradient can be controlled. The mean velocity profiles have been determined for various positions and suction rates by means of total pressure probes together with the intensities of the turbulent velocity fluctuations components, energy spectra and correlations by means of hot wire anemometers, spectral analyser and correlator. The stream lines, the values of the viscous and turbulent shear stresses, of the local wall friction, of the turbulent energy production term, with some information on the dissipation of the energy have been derived from these measurements. For these data the integral of equation of continuity in boundary layer have been drawn. The suction effects on the boundary layer are important. The suction thoroughly alters the mean velocity profiles by increasing the viscous shear stresses  More>>
Authors:
Favre, A; Dumas, R; Verollet, E; [1]  Institut de Mecanique Statistique de la Turbulence, Faculte des Sciences de Marseille, 13 (France)]
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1961
Product Type:
Technical Report
Report Number:
CEA-R-1978
Resource Relation:
Other Information: 8 refs
Subject:
42 ENGINEERING; AIR FLOW; BOUNDARY LAYERS; DISSIPATION FACTOR; ENERGY SPECTRA; FLOW RATE; FLOW STRESS; FLUID-STRUCTURE INTERACTIONS; FRICTION FACTOR; HOT WIRE ANEMOMETERS; MATERIALS TESTING; PLATES; POROUS MATERIALS; PRESSURE GRADIENTS; REYNOLDS NUMBER; SHEAR; SPACE DEPENDENCE; TURBULENCE; TURBULENT FLOW; VELOCITY; WIND TUNNELS
OSTI ID:
20972234
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR07R1978001554
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
47 pages
Announcement Date:
Jan 17, 2008

Citation Formats

Favre, A, Dumas, R, Verollet, E, and Institut de Mecanique Statistique de la Turbulence, Faculte des Sciences de Marseille, 13 (France)]. Boundary layer on a flat plate with suction; Couche limite sur paroi plane poreuse avec aspiration. France: N. p., 1961. Web.
Favre, A, Dumas, R, Verollet, E, & Institut de Mecanique Statistique de la Turbulence, Faculte des Sciences de Marseille, 13 (France)]. Boundary layer on a flat plate with suction; Couche limite sur paroi plane poreuse avec aspiration. France.
Favre, A, Dumas, R, Verollet, E, and Institut de Mecanique Statistique de la Turbulence, Faculte des Sciences de Marseille, 13 (France)]. 1961. "Boundary layer on a flat plate with suction; Couche limite sur paroi plane poreuse avec aspiration." France.
@misc{etde_20972234,
title = {Boundary layer on a flat plate with suction; Couche limite sur paroi plane poreuse avec aspiration}
author = {Favre, A, Dumas, R, Verollet, E, and Institut de Mecanique Statistique de la Turbulence, Faculte des Sciences de Marseille, 13 (France)]}
abstractNote = {This research done in wind tunnel concerns the turbulent boundary layer of a porous flat plate with suction. The porous wall is 1 m long and begins 1 m downstream of the leading edge. The Reynolds number based on the boundary layer thickness is of the order of 16.300. The suction rate defined as the ratio of the velocity perpendicular to the wall to the external flow velocity ranges from 0 to 2 per cent. The pressure gradient can be controlled. The mean velocity profiles have been determined for various positions and suction rates by means of total pressure probes together with the intensities of the turbulent velocity fluctuations components, energy spectra and correlations by means of hot wire anemometers, spectral analyser and correlator. The stream lines, the values of the viscous and turbulent shear stresses, of the local wall friction, of the turbulent energy production term, with some information on the dissipation of the energy have been derived from these measurements. For these data the integral of equation of continuity in boundary layer have been drawn. The suction effects on the boundary layer are important. The suction thoroughly alters the mean velocity profiles by increasing the viscous shear stresses near the wall and decreasing them far from the wall, it diminishes the longitudinal and transversal turbulence intensities, the turbulent shear stresses, and the production of energy of turbulence. These effects are much stressed in the inner part of the boundary layer. On the other hand the energy spectra show that the turbulence scale is little modified, the boundary layer thickness being not much diminished by the suction. The suction effects can be appreciated by comparing twice the suction rate to the wall friction coefficient (assumed airtight), quite noticeable as soon as the rate is about unity, they become very important when it reaches ten. (author) [French] Ces recherches, effectuees en soufflerie, concernent la couche limite turbulente d'une plaque plane avec aspiration. La paroi poreuse s'etend sur 1 m de longueur, a partir d'une distance de 1 m en aval du bord d'attaque. Le nombre de Reynolds d'epaisseur de la couche limite en l'absence d'aspiration est de l'ordre de 16,300. Le taux d'aspiration, defini comme le rapport a la vitesse generale de la vitesse normale a la paroi, est reglable de 0 a 2 pour cent. Le gradient de pression est controlable. On a determine en diverses positions et pour divers taux d'aspiration: avec des sondes de prise de pression totale, les profils de vitesse moyenne, avec des anemometres a fils chauds, analyseur spectral et correlateur, les intensites des differentes composantes des fluctuations turbulentes de vitesse, les spectres d'energie, les correlations. On deduit de ces mesures: le trace des lignes de courant, les valeurs des tensions de frottement visqueux et turbulent, du frottement local a la paroi, et du terme de production de l'energie turbulente, ainsi que des indications sur la dissipation de cette energie. Pour ces calculs, l'equation integree de conservations de la masse dans la couche limite a ete etablie. L'influence de l'aspiration sur la couche limite est importante: elle modifie profondement la forme des profils de vitesse moyenne, augmentant les tensions de frottement visqueux a la paroi, les diminuant ailleurs; elle diminue les intensites de turbulence longitudinale et transversale ainsi que les tensions de frottement turbulent et la production d'energie turbulente. Ces effets sont tres marques dans la zone interne de la couche limite. Par contre, l'etude des spectres d'energie indique que l'echelle de la turbulence, est peu modifiee, l'epaisseur de la couche limite ne diminuant que faiblement sous l'influence de l'aspiration. Les effets de l'aspiration peuvent etre apprecies en comparant le double du taux d'aspiration au coefficient de frottement a la paroi (supposee etanche); notables des que ce rapport depasse l'unite, ils deviennent tres importants lorsqu'il atteint la dizaine. (auteur)}
place = {France}
year = {1961}
month = {Jul}
}