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Acoustic radiation from flows around a cascade of flat plates
Hiroshi Yokoyama,Akiyoshi Iida 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
To clarify the effects of acoustic resonance on flows around a cascade of flat plates, direct simulations and experiments were performed. The Reynolds number based on the chord length and the freestream velocity is 8.7×10<SUP>4</SUP>. The separation-to-thickness ratio s/d is 6.0. The results show that large-scale vortices composed of fine-scale vortices are shed from the downstream edges of the plates. When the acoustic resonance occurs, the coherence between the velocity fluctuations in the wake of a plate and that of the neighboring plate becomes higher. This means that the synchronization of the shedding of the vortices occurs in the wakes of the neighboring plates. The mode of the synchronization is an anti-phase mode. As a result, the acoustic waves radiated from neighboring plates are superposed on each other, and the standing waves generated between plates are reinforced.