Reverse Design of Ultrasonic Absorptive Coating for the Stabilization of Mack Modes

The effects of ultrasonic absorptive coating (UAC) admittance on the first and second modes in a high-speed boundary layer are analyzed using linear stability theory. It is shown that the growth rate of the first mode is increased as UAC admittance phase θ varies from 0.5π to π, whereas the second m...

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Bibliographic Details
Published in:AIAA journal 2019-06, Vol.57 (6), p.2264-2269
Main Authors: Tian, X, Zhao, R, Long, T, Wen, C. Y
Format: Article
Language:English
Subjects:
Absorptivity
Amplification
Boundary layer stability
Destabilization
Electrical impedance
Frequencies
Frequency ranges
Growth rate
Stability analysis
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Summary:The effects of ultrasonic absorptive coating (UAC) admittance on the first and second modes in a high-speed boundary layer are analyzed using linear stability theory. It is shown that the growth rate of the first mode is increased as UAC admittance phase θ varies from 0.5π to π, whereas the second mode is amplified when θ tends to 0.5π and damped if θ≥0.75π. The frequency range of the first mode is broadened when θ is in the vicinity of π, and the second mode shifts to low frequencies when θ
ISSN:0001-1452
1533-385X
DOI:10.2514/1.J058105