V.V.Babenko, A.V.Voskoboinick, V.A.Voskoboinick, V.N.Turick Velocity profiles in the boundary layer above the plate with a cavity |
Acoustic bulletin, Vol. 7 ¹ 3, (2004) |
| The hot-wire anemometry measurements of the velocity field above the plate with local cavity are carried out in open wind tunnel. The investigations are held for laminar and turbulent flows in the range of the Reynolds numbers with respect to plate length (from its start to the cavity site) 4x104-7x105. Mean longitudinal velocity profiles and the defects of mean and fluctuational longitudinal velocity components along the plate and above the cavity are presented. It is shown that the cross-streamlined half-cylindrical cavity on the plane surface changes the boundary layer structure, forming the stream braking and acceleration areas in the vicinity of the plate. With the increase of the flow velocity these areas extend to all thickness of the boundary layer. Changes in the boundary layer structure generate the additional sources of hydrodynamic noise having the sound and pseudo-sound nature. |
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KEY WORDS: wind tunnel, hot-wire anemometry measurements of the velocity field, plate with local cavity, laminar and turbulent flows, the Reynolds number |
| TEXT LANGUAGE: Russian |