Ting Tsung CHANG, Konstantinos KONTIS

DOI Number: N/A

Conference number: HiSST-2024-197

Modulation characteristics of the cavity still inspire people to study through a variety of mathematic approaches. The primary purpose here is to apply not only conventional fast Fourier transform but continuous wavelet transforms to study the spectrum of different cavity flow configurations experimentally. Via modulation analysis, we find that the suggested modulation parameter, normally 0.25, in the theoretical model is not always constant. Since the shear layer impingement on the trailing-edge is the dominant source driving the aeroacoustic mechanism, the angled ramp significantly alters its development, and the level of the pressure tone drops dramatically. An innovative passive control method with sub-cavity introduced recently is studied in this paper as well. The sub-cavity applied on the aft wall, however, considerably amplifies pressure tones inside the sub-cavity and induces extra modes by fluidic resonance. Moreover, the frequency spectrum of AM of individual Rossiter mode indicates the interaction between each mode.

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In Categories: 1.Events, High-Speed Aerodynamics and Aerothermodynamics, HiSST 2024
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