Investigation of a wake decay behind a circular disk in a hydro channel at high Reynolds numbers |
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Authors: | I V Naumov I V Litvinov R F Mikkelsen V L Okulov |
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Institution: | 1.Kutateladze Institute of Thermophysics SB RAS,Novosibirsk,Russia;2.Danish Technical University,Lyngby,Denmark |
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Abstract: | LDA and PIV techniques were used to study the decay of an axisymmetrical turbulent wake originated downstream an immobile disk in a water flume for Reynolds numbers Re = 1.5?2.4?105. Data were compared with experiments performed with a set of thermo-anemometers behind a disk in a wind tunnel at lower Reynolds numbers (Re = 1.3?2.6?104). Observations for a new range of Reynolds number confirmed that the velocity distribution in the disk wake keeps self-similarity. The decay of a wake by the power law ?2/3 in the presented experiments remains until the maximum deficit of velocity becomes comparable with the turbulent pulsation level in the free-stream (less than 2 %). |
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