On the non-linear influence of the edge geometry on vortex shedding in Helmholtz resonators

K. Foerner, M.A. Temiz, W. Polifke, I. Lopez Arteaga, A. Hirschberg

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

8 Citations (Scopus)
2 Downloads (Pure)

Abstract

This study investigates the effect of edge profile of a Helmholtz resonator neck in non-linear regime by means of experiments and large eddy simulations. The dissipation mechanisms in a Helmholtz resonator differ significantly, depending on the sound pressure level. At low levels, i. e., in the linear regime, thermo-viscous effects are responsible for the dissipation of the acous- tic energy since the oscillating flow follows the neck geometry. However, increasing the sound pressure level results in flow separation at the edges. At these points, vortices form which con- vert acoustic perturbation energy to the hydrodynamic mode. This is a strong non-linear effect increasing the dissipation considerably. To observe this effect, experiments and numerical simu- lations are carried out for combinations of various backing volumes, sound pressure levels, and neck profiles. The neck profiles are selected as 45◦–chamfers due to manufacturing concerns. Hereby, a strong dependence on the edge shape is observed in both experiments and numerical simulations. The presence of the chamfer reduces the vortex shedding in comparison to the sharp edge significantly, which leads to a lower acoustic resistance.
Original languageEnglish
Title of host publicationThe 22nd International Conference on Sound and Vibration: ICSV 22, 12-16 July 2015, Florence, Italy
Place of Publications.l.
PublisherInternational Institute of Acoustics and Vibration (IIAV)
Pages1-8
Publication statusPublished - 12 Jul 2015
Event22nd International Congress on Sound and Vibration (ICSV 22), July 12-16, 2015, Florence, Italy - Florence, Italy
Duration: 12 Jul 201516 Jul 2015
http://iiav.org/icsv22/

Conference

Conference22nd International Congress on Sound and Vibration (ICSV 22), July 12-16, 2015, Florence, Italy
Abbreviated titleICSV 22
CountryItaly
CityFlorence
Period12/07/1516/07/15
Internet address

Keywords

  • Non-Linear Acoustics
  • Helmholtz Resonator
  • Transfer impedance
  • Large Eddy Simulations
  • Impedance Tube Measurements

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