The authors have presented results of an experimental investigation into the velocity field in a turbulent boundary layer behind a thin (0.00045 m) three-dimensional plate. The chord of the plate (streamwise length) was equal to 0.55δ (δ is the boundary-layer thickness), and its width, to 1.0δ. The plate was installed at a zero angle of attack at the center of a water channel at a distance of 0.09δ from the surface. Velocity-field measurements have been performed by the Particle Image Velocimetry method at the Reynolds number Reh = 7750 calculated from the channel half-width and the velocity at the center of the channel. It has been shown that the average velocity increased in a logarithmic region of the boundary layer at a distance of its three thicknesses behind the plate. Longitudinal-velocity pulsations decreased in the buffer region of the boundary layer, but grew in the logarithmic region. Vertical pulsations only decreased to a distance of 0.8δ behind the plate, but downstream they were higher than in an unperturbed boundary layer. The high resolution of the velocity field (50·10–6 m) has made it possible to determine shear stresses on the wall from the velocity gradient in a laminar sublayer. Shear stresses on the surface behind the plate decreased in the interval where a growth in the average velocity in the logarithmic region was noted. Maximum reduction in the shear stresses occurred at a distance of 1.8δ and amounted to ~33%. The influence of edge effects was manifested in the less intense reduction on shear stresses in the shorter interval behind the plate.
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References
R. F. Blackwelder and R. E. Kaplan, On the wall structure of the turbulent boundary layer, J. Fluid Mech., 76, 89–112 (1976).
C.-H. P. Chen and R. F. Blackwelder, Large-scale motion in a turbulent boundary layer: A study using temperature contamination, J. Fluid Mech., 89, 1–31 (1978).
R. F. Blackwelder and J. H. Haritonidis, The bursting frequency in turbulent boundary layers, J. Fluid Mech., 132, 87–103 (1983).
J. Kim, On the structure of wall-bounded turbulent fl ows, Phys. Fluids, 26, No. 8, 2088–2097 (1983).
P. Moin and J. Kim, Numerical investigation of turbulent channel flow, J. Fluid Mech., 118, 341−377 (1982).
W. A. Schoppa and F. Hussain, Large-scale control strategy for drag reduction in turbulent boundary layers, Phys. Fluids, 10, 1049–1051 (1998).
R. J. Adrian and P. Moin, Stochastic estimation of organized turbulent structure: Homogeneous shear flow, J. Fluid Mech., 190, 531–559 (1988).
R. J. Adrian, C. D. Meinhart, and C. D. Tomkins, Vortex organization in the outer region of the turbulent boundary layer, J. Fluid Mech., 422, 1–54 (2000).
T. C. Corke, Y. Guezennic, and H. M. Nagib, Modification in drag of turbulent boundary layers resulting from manipulation of large-scale structures, Prog. Astronaut. Aeronaut., 72, 128–143 (1977).
A. Bertelrud, T. V. Truong, and F. Avellan, Drag reduction in turbulent boundary layers using ribbons, AIAA-82-1370.2. 1982.
J. N. Hefner, J. B. Anders, and D. M. Bushnell, Alteration of outer fl ow structures for turbulent drag reduction, AIAA-83-0193. 1983.
A. M. Savill and J. C. Mumford, Manipulation of turbulent boundary layers by outer-layer devices: Skin-friction and flow-visualization results, J. Fluid Mech., 191, 389–418 (1988).
A. Sahin, A. V. Johansson, and P. H. Alfredsson, The possibility of drag reduction by outer layer manipulators in turbulent boundary layers, Phys. Fluids, 31, 2814–2820 (1988).
T. B. Lynn, D. W. Bechert, and D. A. Gerich, Direct drag measurements in a turbulent fl at-plate boundary layer with turbulence manipulators, Exp. Fluids, 19, 405–416 (1995).
A. Yu. D'yachenko, V. L. Zhdanov, Ya. I. Smul'skii, and V. I. Terekhov, Control of separating flow behind a step by means of slotted ribs, J. Eng. Phys. Thermophys., 90, No. 3, 541–549 (2017).
R. E. Falco, New results, a review and synthesis of the mechanism of turbulence production in boundary layers and its modification, AIAA-83-0377, 1983.
A. K. Prasad, R. J. Adrian, C. C. Landreth, and P. W. Offutt, Effect of resolution on the speed and accuracy of particle image, Exp. Fluids, 13, 105−116 (1992).
V. L. Zhdanov, Turbulent Boundary Layers. Methods to Control Shear Stresses, Preprint No. 1 of the A. V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus [in Russian], Izd. Otd. ITMO, Minsk (2018).
C. Chin, R. Örlu, and P. Schlatter, Influence of a large-eddy-breakup-device on the turbulent interface of boundary layers, Flow Turbulence Combust., 99, 823−835 (2017).
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 93, No. 5, pp. 1278–1284, September–October, 2020.
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Zhdanov, V.L., Kukharchuk, I.G. & Terekhov, V.I. Velocity Field behind a Plate Installed in the Inner Region of a Turbulent Boundary Layer. J Eng Phys Thermophy 93, 1233–1239 (2020). https://doi.org/10.1007/s10891-020-02226-0
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DOI: https://doi.org/10.1007/s10891-020-02226-0