A technique is described and the results of an experimental study of the aerodynamic structure of turbulent streamlining, velocity fluctuations, and pressure fields on the surface of a single trench dimple located on the wall of a flat rectangular channel are presented. The trench dimple cross section is a cylindrical segment with hemispheres at its edges. The measurements were carried out with a two-component laser-Doppler anemometer at two angles of the dimple inclination relative to the flow direction phi = 0 and 45 degrees. The development of the flow in the direction transverse to the trench, as well as along it, was studied. The fundamental difference between the velocity fields and their fluctuations in a trench located normally and at an angle to the flow is shown.
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