### Uittreksel

Taal | Engels |
---|---|

Pagina's | 163-191 |

Aantal pagina's | 29 |

Tijdschrift | Journal of Fluid Mechanics |

Volume | 703 |

DOI's | |

Status | Gepubliceerd - 2012 |

### Vingerafdruk

### Citeer dit

}

*Journal of Fluid Mechanics*, vol. 703, blz. 163-191. DOI: 10.1017/jfm.2012.203

**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.

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 -