Effects of Pulsation on Grid-Generated Turbulence

[+] Author and Article Information
S. Shahidinejad

Mechanical Engineering Department, Sharif University of Technology, P.O. Box 11365/9567, Tehran, Iran

I. Jerphanion, F. Magaud, M. Souhar

J. Fluids Eng 123(4), 951-953 (May 16, 2001) (3 pages) doi:10.1115/1.1412461 History: Received August 02, 2000; Revised May 16, 2001
Copyright © 2001 by ASME
Topics: Turbulence
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Taylor, G. I., 1935, “Statistical Theory of Turbulence,” Part I and II, Proc. R. Soc. London, Ser. A, 151–421.
Comte-Bellot,  G., and Corrsin,  S., 1966, “The Use of a Contraction to Improve the Isotropy of Grid Generated turbulence,” J. Fluid Mech., 25, pp. 657–682.
Mohamed,  M. S., and LaRue,  J. C., 1990, “The Decay Power Law in Grid-generated Turbulence,” J. Fluid Mech., 219, pp. 195–214.
Tresso,  R., and Munoz,  D. R., 2000, “Homogeneous, Isotropic Flow in Grid-generated Turbulence,” ASME J. Fluids Eng., 122, pp. 51–56.
Martin, M., 1969, “Contribution à l’étude de la convection thermique pulsée autour des cylinders,” Ph.D. thesis, Université de Nancy, France.
Bruun, H. H., 1995, Hotwire Anemometry: Principles and Signal Analysis, Oxford University Press, New York.
Hussain,  A. K. M. F., and Reynolds,  W. C., 1970, “The Mechanics of an Organized Wave in Turbulent Shear Flow,” J. Fluid Mech., 41, 241–258.


Grahic Jump Location
(a) Schematic sketch of the experimental facility (dimensions in cm). 1. Wind tunnel, test section width=40 cm. 2. Hot wire probe. 3. Pulsation mechanism. 4. Grid. A : To hot wire anemometry system. B : Reference signal to data acquisition system. (b) A typical record of the fluctuating velocity components u, v and the corresponding periodic non-fluctuating part ũ at 8.5 Hz.
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Normalized power spectrum of the stream-wise velocity component at 8.5 Hz. (a) the original signal, (b) the fluctuating part. A : Eu(n)B : Eu(n)C : n−5/3.
Grahic Jump Location
Variation of normal Reynolds stresses downstream of the grid. (a) stationary, (b) pulsating flow, ×8.5 Hz, O 13 Hz, Δ 18 Hz.
Grahic Jump Location
Variation of normalized pulsation energy, ũũ/ū2×8.5 Hz, O 13 Hz, Δ 18 Hz
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Streamwise variation of macro length scales Λuv. (a) stationary flow, (b) pulsating flow.




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