Experimental study of the flow turbulent structure in a cell of a lattice matrix

The experimental results on the turbulent flow structure in a lattice matrix cell, which is a region between intersecting ribs on the opposite walls of a flat channel, are presented. The angle between the ribs was 2 β = 60°, 90° and 120°; the Reynolds number calculated from the average velocity and...

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Bibliographic Details
Published in:Thermophysics and aeromechanics 2022-11, Vol.29 (6), p.1013-1020
Main Authors: Zolotukhin, A. V., Chokhar, I. A., Terekhov, V. I.
Format: Article
Language:English
Subjects:
Aerodynamic characteristics
Diameters
Fluid dynamics
Fluid flow
Phase Doppler Anemometer
Physics
Physics and Astronomy
Reynolds number
Thermodynamics
Three dimensional flow
Turbulence
Turbulent flow
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Summary:The experimental results on the turbulent flow structure in a lattice matrix cell, which is a region between intersecting ribs on the opposite walls of a flat channel, are presented. The angle between the ribs was 2 β = 60°, 90° and 120°; the Reynolds number calculated from the average velocity and hydraulic diameter of the channel was varied in the range Re = (1–7)·10 4 . The aerodynamic characteristics of the flow inside a lattice matrix cell placed in a rectangular channel with a cross section of 20×150 mm and a length of 400 mm were measured using a two-component laser Doppler anemometer (LDA). The flow structure was studied in individual cells of 15×15 mm, formed by crossing ribs on the opposite channel walls. The complex three-dimensional structure of the flow in the matrix cells and strong turbulence of the flow in the near-wall regions are shown. The installation of ribs leads to a significant increase in hydraulic losses, especially at large crossing angles.
ISSN:1531-8699
0869-8643
1531-8699
DOI:10.1134/S0869864322060221