Uittreksel
| Taal | Engels |
|---|---|
| Pagina's | 163-191 |
| Aantal pagina's | 29 |
| Tijdschrift | Journal of Fluid Mechanics |
| Volume | 703 |
| DOI's | |
| Status | Gepubliceerd - 2012 |
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Aeroacoustic power generated by a compact axisymmetric cavity : prediction of self-sustained oscillation and influence of the depth. / Nakiboglu, G.; Manders, H.B.M.; Hirschberg, A.
In: Journal of Fluid Mechanics, Vol. 703, 2012, blz. 163-191.Onderzoeksoutput: Bijdrage aan tijdschrift › Tijdschriftartikel › Academic › peer review
TY - JOUR
T1 - Aeroacoustic power generated by a compact axisymmetric cavity : prediction of self-sustained oscillation and influence of the depth
AU - Nakiboglu,G.
AU - Manders,H.B.M.
AU - Hirschberg,A.
PY - 2012
Y1 - 2012
N2 - Aeroacoustic power generation due to a self-sustained oscillation by an axisymmetric compact cavity exposed to a low-Mach-number grazing flow is studied both experimentally and numerically. The feedback effect is produced by the velocity fluctuations resulting from a coupling with acoustic standing waves in a coaxial pipe. A numerical methodology that combines incompressible flow simulations with vortex sound theory is used to predict the time-averaged acoustic source power generated by the cavity. The effect of cavity depth on the whistling is addressed. It is observed that the whistling occurs around a peak-whistling Strouhal number which depends on the cavity depth to width ratio. The proposed numerical method provides excellent predictions of the peak-whistling Strouhal number as a function of cavity depth. Given the oscillation amplitude, the numerical method predicts the time-averaged acoustic source power within a factor of two for moderate fluctuation amplitudes. For deep cavities the time-averaged acoustic source power appears to be independent of the cavity depth
AB - Aeroacoustic power generation due to a self-sustained oscillation by an axisymmetric compact cavity exposed to a low-Mach-number grazing flow is studied both experimentally and numerically. The feedback effect is produced by the velocity fluctuations resulting from a coupling with acoustic standing waves in a coaxial pipe. A numerical methodology that combines incompressible flow simulations with vortex sound theory is used to predict the time-averaged acoustic source power generated by the cavity. The effect of cavity depth on the whistling is addressed. It is observed that the whistling occurs around a peak-whistling Strouhal number which depends on the cavity depth to width ratio. The proposed numerical method provides excellent predictions of the peak-whistling Strouhal number as a function of cavity depth. Given the oscillation amplitude, the numerical method predicts the time-averaged acoustic source power within a factor of two for moderate fluctuation amplitudes. For deep cavities the time-averaged acoustic source power appears to be independent of the cavity depth
U2 - 10.1017/jfm.2012.203
DO - 10.1017/jfm.2012.203
M3 - Article
VL - 703
SP - 163
EP - 191
JO - Journal of Fluid Mechanics
T2 - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
SN - 0022-1120
ER -