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Experimental study of the subsonic flat plate turbulent boundary layer with forced thermal convection

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.220
pages 159-162

Sebastian Grosse
Institute of Aerodynamics, RWTH Aachen University, Wüllnerstr. 5-7, D-52062, Germany; and Laboratory for Aero- and Hydrodynamics, Delft University of Technology, Leeghwaterstraat 21, 2628 CA Delft, The Netherlands

Wolfgang Schroder
Institute of Aerodynamics RWTH Aachen University Wullnerstr. 5a, 52062 Aachen, Germany

Michael Klaas
Institute of Aerodynamics, RWTH Aachen University, Wüllnerstr. 5-7, D-52062, Germany


A subsonic zero-pressure gradient uniformly-heated turbulent boundary layer at a Reynolds number in the range of 3560 ≤ Reθ ≤ 5360 was investigated. Particle-image velocimetry measurements were carried out at selected positions in the streamwise direction for several wind-tunnel speeds and for different wall temperatures to show the convection effects to expand the boundary-layer thickness and to enlarge the turbulence intensities in the log-law and wake region. The inclination of large-scale ramp-like vortex packets increases to higher characteristic angles, i.e., the mean angles are enlarged by approx. 10°. Hairpin-like vortex structures originating from the near-wall region seem to undergo higher climbing rates in the wall-normal direction causing the above mentioned significant changes in the mean velocity profiles, the boundary-layer thickness, and the strongly increased distributions of turbulence intensities in the wake region of the boundary layer. The two-point correlation distribution of the streamwise velocity fluctuations Ruu is increased for wall distances y/δ = 0.1 to y/δ = 0.75 indicating the existence of coherent structures in higher regions of the boundary layer.

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