期刊
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
卷 84, 期 -, 页码 302-310出版社
ELSEVIER
DOI: 10.1016/j.euromechflu.2020.03.003
关键词
Acoustic resonances; Spheroid; Velocimetry; Rotation
资金
- ANR, France [13-BS06-0010]
- STFC, UK [ST/R00059X/1]
- Labex OSUG@2020 [ANR10 LABX56]
- STFC [ST/R00059X/1] Funding Source: UKRI
The acoustic spectrum of a gas-filled resonating cavity can be used to indirectly probe its internal velocity field. This unconventional velocimetry method is particularly interesting for opaque fluid or rapidly rotating flows, which cannot be imaged with standard methods. This requires to (i) identify a large enough number of acoustic modes, (ii) accurately measure their frequencies, and (iii) compare with theoretical synthetic spectra. Relying on a dedicated experiment, an air-filled rotating spheroid of moderate ellipticity, our study addresses these three challenges. To do so, we use a comprehensive theoretical framework, together with finite-element calculations, and consider symmetry arguments. We show that the effects of the Coriolis force can be successfully retrieved through our acoustic measurements, providing the first experimental measurements of the rotational splitting (or Ledoux) coefficients for a large collection of modes. Our results pave the way for the modal acoustic velocimetry to be a robust, versatile, and non-intrusive method for mapping large-scale flows. (C) 2020 Elsevier Masson SAS. All rights reserved.
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