Acoustic Effects of a Rotationally Oscillating Rod in a Rod-Airfoil Configuration

Leonidas Siozos-Rousoulis, Ghader Ghorbaniasl, Christian Lacor

Onderzoeksoutput: Conference paper

Samenvatting

Acoustic effects of a rotationally oscillating cylinder are investigated as part of the rod-airfoil canonical benchmark. A 2D hybrid computational aeroacoustics approach is used for noise prediction, where oscillating rotation is introduced to the cylinder at varying excitation frequencies and amplitudes. It is shown that cylinder oscillating rotation generally proves to increase overall noise emissions and results in redirection of emitted noise. Moreover, the existence of a lock-in regime for forcing frequencies close to the natural shedding frequency is detected, which affects the shedding frequency and the acoustic spectra. The excitation frequency shifts the dominant frequency of vortex shedding, as well as the dominant peaks of radiated noise. The outcome of the investigation implies that forcing frequencies greater than the natural shedding frequency generally increase acoustic emissions with multiple tonal components. In addition, increasing the amplitude of oscillation results in higher noise generation.
Originele taal-2English
TitelAIAA 2015-2827
UitgeverijAIAA
Pagina's1-13
Aantal pagina's13
StatusPublished - 2015
Evenement21st AIAA/CEAS Aeroacoustics Conference - Dallas, Texas, United States
Duur: 22 jun 201526 jun 2015

Conference

Conference21st AIAA/CEAS Aeroacoustics Conference
Land/RegioUnited States
StadDallas, Texas
Periode22/06/1526/06/15

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