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- Title
Radiated sound from a circular cylinder in a turbulent shear layer.
- Authors
Bilka, Michael J.; Kerrian, Peter; Ross, Mark H.; Morris, Scott C.
- Abstract
The effect of turbulent approach flow on the radiated sound from a circular cylinder was studied experimentally. The approach flow turbulence was provided by a single stream shear layer produced by an open jet anechoic tunnel facility. An instrumented cylinder was used to measure steady and unsteady surface pressure. The sound radiated from the cylinder placed in both an irrotational approach flow and the highly turbulent approach flow of the shear-layer was measured and compared. The cylinders located within the shear layer produced a less tonal sound with a higher broadband amplitude when compared to that of the free-stream approach flow. Secondly, the radiated sound from cylinders of different diameters was investigated to assess the effect of the ratio of cylinder diameter to approach flow length scale. It was found that as this ratio decreased, the broadband sound levels decreased as well. A simple theoretical model was then used to provide a prediction of the radiated sound for the cylinder within the shear layer. The theoretical model used statistics of the velocity field of the approach shear layer and the radiated sound spectrum the cylinder placed in a free stream. It was found that this method provided a similar spectral shape to the measured radiated sound.
- Subjects
TURBULENT jets (Fluid dynamics); HYDRAULIC cylinders; SURFACE pressure; ATMOSPHERIC turbulence; BROADBAND amplifiers; TURBULENT heat transfer; ENGINE cylinder hydrodynamics
- Publication
International Journal of Aeroacoustics, 2014, Vol 13, Issue 7/8, p511
- ISSN
1475-472X
- Publication type
Article
- DOI
10.1260/1475-472X.13.7-8.511