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

The evolution of the first- and second-mode instabilities in a hypersonic flat plate boundary layer is investigated. Experiments are conducted in a Mach 6.5 quiet wind tunnel using particle image velocimetry, Rayleigh-scattering flow visualization, and schlieren methods. Glow discharge is introduced...

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Bibliographic Details
Published in:Physics of fluids (1994) 2020-05, Vol.32 (5)
Main Authors: Li, Chi, Zhang, Yunchi, Lee, Cunbiao
Format: Article
Language:English
Subjects:
Evolution
Flat plates
Flow visualization
Fluid dynamics
Frequency ranges
Glow discharges
Hypersonic boundary layer
Particle image velocimetry
Physics
Wind tunnels
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Summary:The evolution of the first- and second-mode instabilities in a hypersonic flat plate boundary layer is investigated. Experiments are conducted in a Mach 6.5 quiet wind tunnel using particle image velocimetry, Rayleigh-scattering flow visualization, and schlieren methods. Glow discharge is introduced as an artificial disturbance. The results show that an artificially introduced disturbance in the first-mode frequency range can excite a specific second-mode wave that is one of the high-order harmonics of the added disturbance. For the first time, we find a clear harmonic relationship between the first- and second-mode waves, as well as the phase lock phenomenon between them.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0008457