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ISSN オンライン: 2642-0554

DEVELOPMENT OF TURBULENCE STATISTICS IN THE NEAR FIELD BEHIND MULTI-SCALE GRIDS

Per-Age Krogstad
Department of Energy and Process Engineering, Norwegian University of Science and Technology N-7491 Trondheim, Norway

要約

The flows immediately behind two multi-scale grids have been studied experimentally and the results compared to data obtained behind a conventional grid. The data sets consist of measurements by means of Laser Doppler anemometry, as well as hot wire measurements using various purpose made probes. By comparing the initial turbulent energy development, as well as third and fourth order statistics, it is shown that the particulars of the grid geometry is lost after just a few mesh lengths downstream. This was further confirmed by inspecting the probability density and spectral energy distributions. Hence the present measurements suggest that the grid geometry is only important in setting the initial conditions for the turbulence development and does not affect the distributions in the far field.