Stability of space-periodic flow with separation of a laminar boundary layer

An unstable laminar flow over a wavy region of a plate placed parallel to the oncoming air flow is studied. The results have been obtained by the hot-wire method in a low-turbulent wind tunnel at low subsonic velocities. Flow near a wall with transverse undulation, whose amplitude is sufficiently la...

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Published inThermophysics and aeromechanics Vol. 26; no. 6; pp. 837 - 844
Main Authors Boiko, A. V., Dovgal, A. V., Sorokin, A. M.
Format Journal Article
LanguageEnglish
Published Novosibirsk Kutateladze Institute of Thermophysics SB RAS 01.11.2019
Springer Nature B.V
Subjects
Aerodynamics
Air flow
Boundary layer stability
Computational fluid dynamics
Control methods
Flow separation
Flow stability
Laminar boundary layer
Laminar flow
Physics
Physics and Astronomy
Thermodynamics
Turbulent wind
Wind tunnels
boundary layer separation
space-periodic flow
hydrodynamic stability
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Summary:An unstable laminar flow over a wavy region of a plate placed parallel to the oncoming air flow is studied. The results have been obtained by the hot-wire method in a low-turbulent wind tunnel at low subsonic velocities. Flow near a wall with transverse undulation, whose amplitude is sufficiently large and can contribute to the formation of local regions of boundary layer separation, is considered. The external harmonic (acoustic) forcing of the periodic flow leads to the suppression of perturbations that dominate in the spectrum of velocity disturbances near the model surface. The results of this work may be useful in developing methods for controlling spatially inhomogeneous flows.
ISSN:0869-8643
1531-8699
DOI:10.1134/S0869864319060052