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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(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.
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Variation of normal Reynolds stresses downstream of the grid. (a) stationary, (b) pulsating flow, ×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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Variation of normalized pulsation energy, ũũ/ū2×8.5 Hz, O 13 Hz, Δ 18 Hz




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