Experimental investigation of the flow structure in a single trench hole
V.I. Terekhov1,2, V.V. Terekhov1, I.A. Chokhar1, N. Yan Lun1,2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: aerodynamics, single trench hole, flow separation, pressure fields, velocity fluctuations
Abstract
A technique is described and the results of an experimental study of the aerodynamic structure of a turbulent streamlining, velocity fluctuations and pressure fields on the surface of a single trench hole located on the wall of a flat rectangular channel are presented. The trench hole cross-section is a cylindrical segment with hemispheres at its edges. The measurements were carried out with a two-component laser-Doppler velocity meter at two angles of hole inclination relative to the flow direction φ=0 и 45°. The development of the flow in the direction transverse to the trench, as well as along its span, 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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