Imperial College London
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Dr. Oliver Buxton

Faculty of Engineering, Department of Aeronautics

Reader in Experimental Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 5118o.buxton Website CV

 
 
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Location

 

213City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Rodríguez-López:2017:10.2514/1.J056057,
author = {Rodríguez-López, E and Brizzi, LE and Valeau, V and Bruce, PJK and Buxton, ORH},
doi = {10.2514/1.J056057},
journal = {AIAA Journal},
pages = {264--278},
title = {Aeroacoustic Characterization of Single- and Multiscale Porous Fences},
url = {http://dx.doi.org/10.2514/1.J056057},
volume = {56},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - An experimental characterization of the acoustic behavior and the flowfield past several wall-mounted porousfences is presented. Particle image velocimetry is conducted in the near field of the fences. It shows a spanwiseperiodicity (associated with the periodic geometry of the grid) of regions where well-defined wakes appear as opposedto regions with a lower mass flow rate influenced by strong recirculations. The acoustic behavior is characterizedusing a microphone array enabling the spatial locationof noise sourcesto bedetermined. Broadband noise is observedfor all grids except for the fractal square grid, where a clear peak appears. The intensity of noise spectra displaysscalabilitywith MachnumberM6(dipoles), and the preferentialfrequencyfor the fractal square case is shown to scalewith thefreestreamvelocity(suggestingasheddingmechanism).For certaingrids, themeanandinstantaneous spatiallocations of the noise sources also present a spanwise preferential arrangement coincident with regions where the flowpresents well-defined wakes. Regarding the intermittency of the unsteady sources, they present smaller temporalwidth, separation, and spatial extent for increasing freestream velocity. However, the ratio between these quantitiesseems to be constant to within 6% for different Mach numbers.
AU  - Rodríguez-López,E
AU  - Brizzi,LE
AU  - Valeau,V
AU  - Bruce,PJK
AU  - Buxton,ORH
DO  - 10.2514/1.J056057
EP  - 278
PY  - 2017///
SN  - 0001-1452
SP  - 264
TI  - Aeroacoustic Characterization of Single- and Multiscale Porous Fences
T2  - AIAA Journal
UR  - http://dx.doi.org/10.2514/1.J056057
UR  - http://hdl.handle.net/10044/1/54426
VL  - 56
ER  -
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