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TECHNICAL PAPERS

Slot Jet Impinging On A Concave Curved Wall

[+] Author and Article Information
Virginie Gilard

 Laboratoire d’Etudes Aérodynamiques (UMR 6609), Boulevard Marie et Pierre Curie, Téléport 2, BP 30179, 86960 Futuroscope Chasseneuil Cedex, France

Laurent-Emmanuel Brizzi

 Laboratoire d’Etudes Aérodynamiques (UMR 6609), Boulevard Marie et Pierre Curie, Téléport 2, BP 30179, 86960 Futuroscope Chasseneuil Cedex, Francelaurent.brizzi@lea.univ-poitiers.fr

J. Fluids Eng 127(3), 595-603 (Jan 20, 2005) (9 pages) doi:10.1115/1.1905643 History: Received September 23, 2002; Revised January 20, 2005

In order to study the aerodynamics of a slot jet impinging a concave wall, flow visualizations, velocity measurements by particle image velocimetry (PIV) (mean velocity fields and the Reynolds stresses) and mean pressure measurements were carried out. Among the studied parameters is the effect of the relative curvature of the wall, in particular the low curvature radius because of the presence of three semistable positions. It is the first time that this type of behavior is observed in fluid mechanics. Thus three flow modes are observed and their behaviors are described. These different behaviors modify considerably the impinging jet structure and the turbulence values. Finally, from the pressure measurements, we were able to determine a criterion that allows us to know the behavior of the jet.

Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 2

Experimental device

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Figure 3

Distributions of mean and fluctuating values of the velocity for the free jet (Reb=3200)

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Figure 4

Example of image of a jet impinging a curved wall. (Reb=1400,H∕b=5,Dc∕b=9.4)

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Figure 5

Mean velocity field and rmsu values (Reb=3200;H∕b=7;Dc∕b=9.4)

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Figure 6

Mean velocity fields and rms values of horizontal component U (a) and vertical component V (b) (Reb=3200;H∕b=7;Dc∕b=5.2)

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Figure 7

Histograms of the horizontal component (a) and the vertical component (b) at the reference point (x∕b=6.7;y∕b=0)(Reb=3200,H∕b=7,Dc∕b=9.4)

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Figure 8

Histograms of the horizontal component (a) and the vertical component (b) at the reference point (x∕b=5.3;y∕b=0.7)(Reb=3200,H∕b=7,Dc∕b=5.2)

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Figure 9

Scheme of the flow for (a) Dc∕b=9.4 and for (b) Dc∕b=5.2

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Figure 10

Mean velocity field for the three modes (Reb=3200,H∕b=7,Dc∕b=5.2)

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Figure 11

Instantaneous velocity field for the three modes (Reb=3200,H∕b=7,Dc∕b=5.2)

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Figure 12

Bifurcation diagram for Dc∕b=5.2

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Figure 13

Mean velocity field and rmsu values for the three modes (Reb=3200,H∕b=7,Dc∕b=5.2)

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Figure 14

Mean pressure distribution (Reb=3200,H∕b=7)

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Figure 15

Mean pressure distributions for the three impinging heights (Reb=3200,Dc∕b=5.2)

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