流⁃声⁃固耦合诱发结构振动及其抑制实验

doi:10.7527/S1000-6893.2024.29970

Abstract

Abstract:

Blade vibration caused by flow-induced acoustic resonance is a typical representative of non-synchronous vibration problems inside the compressor. Existing research focuses mostly on vortex-acoustic coupling in acoustic resonance， while less attention is paid to structural vibration issues caused by acoustic resonance. To study the complex fluid-acoustic-structure coupling phenomenon in acoustic resonance， this study carried out acoustic resonance experiments on an aluminum flat plate in a low-speed wind tunnel. Synchronized measurements were performed on the shedding vortex pulsation velocity at the trailing edge of the plate， the acoustic pressure inside the duct， and the plate vibration. The experimental results captured the phenomenon of frequency locking and amplitude jumps， and found that the amplitude of plate vibration caused by acoustic resonance can reach half of the flow-induced resonance amplitude， indicating that vibration induced by acoustic resonance needs to be taken seriously in industrial applications. Finally， the acoustic resonance suppression strategy based on the non-local acoustic liner on the wall was studied， achieving dual suppression of sound pressure within the duct and plate vibration.

Key words: acoustic resonance, flow-induced structural resonance, shedding vortex, fluid-acoustic-structure coupling, non-local acoustic liner

CLC Number:

Zhiliang HONG, Li XUE, Yilei FU, Lingfeng CHEN. Experimental investigation on structural vibration induced by fluid-acoustic-structure coupling and its suppression[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(19): 229970.

Figures/Tables 9

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Experimental investigation on structural vibration induced by fluid-acoustic-structure coupling and its suppression

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