Experimental investigation of the aero-acoustic interaction at an area-expansion
| Autor: | Susann Boij, Luck Peerlings, Hans Bodén |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Acoustics and Ultrasonics Scattering Mechanical Engineering Plane wave 02 engineering and technology Mechanics Condensed Matter Physics 01 natural sciences Expansion ratio symbols.namesake 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials 0103 physical sciences Compressibility symbols Strouhal number End correction 010301 acoustics Uncertainty analysis Dimensionless quantity |
| Zdroj: | Journal of Sound and Vibration. 457:197-211 |
| ISSN: | 0022-460X |
| DOI: | 10.1016/j.jsv.2019.04.003 |
| Popis: | Experimental results on the aero-acoustic interaction at an area expansion are scarce. In this study, new experimental data is acquired of the aero-acoustic interaction at an area expansion and compared with recent modeling efforts. The aero-acoustic interaction at an area expansion with expansion ratio η = 0.309 is investigated by measuring the scattering matrix for plane waves at 5 different flow speeds in the incompressible regime. The experimental results are complimented with a comprehensive uncertainty analysis to determine the precision of the data. The scattering coefficients together with derived quantities such as absorption coefficients and dimensionless end corrections are compared against recent analytical results. It is shown that there is consistent deviation between the models and measurement results for certain scattering coefficients. The measured end correction on Strouhal number close to the critical Strouhal number shows a relatively abrupt change. This in comparison with the models, where the change is predicted to be more gradual. Similar observations are made for the absorption coefficient for waves incident upstream of the area expansion, although a qualitative comparison is difficult to make in this case because of the strong influence of the flow downstream of the area-expansion on the results. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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