LDA-Measurements of Transitional Flows Induced by a Square Rib
Author:
Becker S.1, Stoots C. M.21, Condie K. G.2, Durst F.1, McEligot D. M.34
Affiliation:
1. Lehrstuhl fu¨r Stro¨mungsmechanik (LSTM), Friedrich-Alexander Universita¨t, Cauerstr. 4, D-95058 Erlangen-Nuremberg, Germany 2. Idaho National Engineering and Environmental Laboratory (INEEL), Idaho Falls, ID 83415-3890 3. , Idaho National Engineering and Environmental Laboratory (INEEL), Idaho Falls, ID 83415-3885 4. University of Arizona, Tucson, AZ 85721
Abstract
New fundamental measurements are presented for the transition process in flat plate boundary layers downstream of two-dimensional square ribs. By use of laser Doppler anemometry (LDA) and a large Matched-Index-of-Refraction (MIR) flow system, data for wall-normal fluctuations and Reynolds stresses were obtained in the near wall region to y+<0.1 in addition to the usual mean streamwise velocity component and its fluctuation. By varying velocity and rib height, the experiment investigated the following range of conditions: k+=5.5 to 21, 0.3<k/δ1<1,180<Rek<740,6×104<Rex,k<1.5×105,ReΘ660,−125<x−xk/k<580. Consequently, results covered boundary layers which retained their laminar characteristics through those where a turbulent boundary layer was established shortly after reattachment beyond the forcing rib. For “large” elements, evolution of turbulent statistics of the viscous layer for a turbulent boundary layer y+<∼30 was rapid even in flows where the mean velocity profile still showed laminar behavior.
Publisher
ASME International
Subject
Mechanical Engineering
Reference39 articles.
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