Experimental study of the flow turbulent structure in a cell of a lattice matrix
A.V. Zolotukhin1,2, I.A. Chokhar1, V.I. Terekhov1,2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk,Russia
2Novosibirsk State Technical University, Novosibirsk,Russia
Keywords: lattice matrix, coplanar channels, rib crossing angle, aerodynamics, profiles of velocity and turbulent pulsations, hydraulic losses
Abstract
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 2β = 60º, 90º and 120º; the Reynolds number calculated from the average velocity and hydraulic diameter of the channel was varied in the range Re = (1 - 7)×104. 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.
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