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CHARACTERIZATION OF TURBULENT FLOW DOWNSTREAM OF A THREE-DIMENSIONAL AXISYMMETRIC BUMP

Ruolong Ma
AOE Department, Virginia Tech, Blacksburg, VA 24061, USA

Roger L . Simpson
Department of Aerospace and Ocean Engineering Virginia Polytechnic Institute and State University Blacksburg, VA 24061-0203 USA

Abstrakt

The downstream wake development from a high momentum thickness Reynolds number ( Reθ ~7300) boundary layer flow over an axisymmetric bump (with circular base) of height H = 2δ is experimentally studied using a four-sensor hot-wire probe. Three-component mean velocity, turbulence, velocity spectra, and two-point correlation measurements were made behind the bump within a distance from x/H =2.62 to 6.59 to fully document the turbulent flow structure and its streamwise evolution. Mean flow development, structure and decay of the turbulence, the contribution and distribution of low frequency turbulence fluctuations are presented.