Numerical simulation of interaction of a microjet array with a turbulent shear flow

Results of numerical investigations of the characteristics of a turbulent boundary layer in the case of air blowing through a smooth flat perforated surface with a single hole and also through a similar surface with a group of staggered holes 0.18 mm in diameter ( d/δ =0.0072) in a low-velocity flow...

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Bibliographic Details
Published in:Thermophysics and aeromechanics 2023-07, Vol.30 (4), p.615-630
Main Authors: Kornilov, V. I., Menshchikova, I. V., Pivovarov, A. A.
Format: Article
Language:English
Subjects:
Blowing
Diameters
Fluid dynamics
Fluid flow
Friction reduction
Physics
Physics and Astronomy
Reynolds number
Shear flow
Thermodynamics
Transverse shear
Turbulent boundary layer
Turbulent flow
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Summary:Results of numerical investigations of the characteristics of a turbulent boundary layer in the case of air blowing through a smooth flat perforated surface with a single hole and also through a similar surface with a group of staggered holes 0.18 mm in diameter ( d/δ =0.0072) in a low-velocity flow are reported. The Reynolds number Re** based on the momentum thickness δ ** ahead of the perforated region is 2600. The blowing coefficient C b is varied in the interval from zero to 0.0438. The influence of some geometric parameters, in particular, the distance between the hole centers, on the properties of the transverse shear flow for identical intensities of blowing in situations with one hole and with a group of holes is analyzed. All observations reveal stable reduction of local friction whose value varies depending on the number of holes and their arrangement on the surface.
ISSN:1531-8699
0869-8643
1531-8699
DOI:10.1134/S0869864323040029