Influence of glow discharge on evolution of disturbance in a hypersonic boundary layer: The effect of second mode

This is the companion volume on the effects of artificial disturbance on the transition process of a boundary layer over a flat plate. The artificial disturbance with the frequency in the range of second-mode instability is introduced into the boundary layer by glowing discharge on the surface of th...

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Bibliographic Details
Published in:Physics of fluids (1994) 2020-07, Vol.32 (7)
Main Authors: Zhang, Yunchi, Li, Chi, Lee, Cunbiao
Format: Article
Language:English
Subjects:
Boundary layer stability
Boundary layer transition
Flat plates
Fluid dynamics
Glow discharges
Hypersonic boundary layer
Instability waves (fluids)
Physics
Visualization
Wall pressure
Wind tunnels
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Summary:This is the companion volume on the effects of artificial disturbance on the transition process of a boundary layer over a flat plate. The artificial disturbance with the frequency in the range of second-mode instability is introduced into the boundary layer by glowing discharge on the surface of the plate. Experiments are performed using Rayleigh-scattering visualization, wall pressure pulsations measurement, and high-frequency schlieren visualization in the Φ300 mm hypersonic quiet wind tunnel at Peking University. It is found that the second-mode instability waves are stimulated remarkably by the artificial disturbance, and the boundary layer transition is triggered effectively. The second-mode instability interacts with the first mode via a phase-lock mechanism, which leads to the rapid amplification of the first mode and the moving forward of transition location.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0011299