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TECHNICAL PAPERS

Turbulence Structures Downstream of a Localized Injection in a Fully Developed Channel Flow

[+] Author and Article Information
M. Haddad

Laboratoire de Mécanique et d’Énergétique, Université de Valenciennes et du Hainaut-cambrésis, 59313 Valenciennes, Cedex 9, Francemouloud.haddad@univ-valenciennes.fr

L. Labraga

Laboratoire de Mécanique et d’Énergétique, Université de Valenciennes et du Hainaut-cambrésis, 59313 Valenciennes, Cedex 9, Francelarbi.labraga@univ-valenciennes.fr

L. Keirsbulck

Laboratoire de Mécanique et d’Énergétique, Université de Valenciennes et du Hainaut-cambrésis, 59313 Valenciennes, Cedex 9, Francelaurent.keirsbulck@univ-valenciennes.fr

J. Fluids Eng 128(3), 611-617 (Oct 19, 2005) (7 pages) doi:10.1115/1.2175168 History: Received June 09, 2005; Revised October 19, 2005

The effects of localized blowing through a porous strip on a turbulent channel were studied experimentally. The measurements were conducted downstream of the porous strip for three blowing rates: 3%, 5%, and 8% (of the velocity at the centerline of the channel). It was found that the injection affects several turbulence parameters. Indeed, blowing decreases the skin friction while it increases the turbulence intensities and the Reynolds stresses. A study of cross-correlations in the streamwise and spanwise direction’s showed that both inclination angles in the (x,y) and (x,z) planes were increased with blowing.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Nonscaled experimental setup

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Figure 2

Global characteristics of fully developed flow

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Figure 3

Effect of blowing on static pressure profiles: ●, Cq=0; ◻, Cq=0.03; ▵, Cq=0.05; ▿, Cq=0.08

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Figure 4

Effect of blowing on skin friction coefficient. Symbols are the same as in Fig. 3.

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Figure 5

Effect of blowing on mean velocity profiles. The data have been scaled with uτ from the unforced case. Symbols are the same as in Fig. 3.

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Figure 6

Effect of blowing on the turbulence intensities. Symbols are the same as in Fig. 3.

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Figure 7

Effect of blowing on Reynolds stress profiles. Symbols are the same as in Fig. 3;…, Kim (23); ▴ Günther (24).

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Figure 8

Effect of blowing on the integral scale at x∕b=11.5. Symbols are the same as in Fig. 3.

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Figure 9

Measurement procedure for acquiring cross-correlation data

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Figure 10

Time shift of maximum correlation coefficients. Symbols are the same as in Fig. 3.

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Figure 11

Effect of blowing on the coherent structures inclination angle in the (x,y) plane. Symbols are the same as in Fig. 3.

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Figure 12

Sketch of the inclination angle of the coherent structures. (a) (x,y) plane. (b) (x,z) plane.

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Figure 13

Effect of blowing on spanwise cross-correlations

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Figure 14

Spanwise spatial correlations at T+=0. Symbols are the same as in Fig. 3.

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