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https://hdl.handle.net/2440/106875
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Type: | Journal article |
Title: | Flow-induced noise generated by sub-boundary layer steps |
Author: | Doolan, C. Moreau, D. |
Citation: | Experimental Thermal and Fluid Science, 2016; 72:47-58 |
Publisher: | Elsevier |
Issue Date: | 2016 |
ISSN: | 0894-1777 1879-2286 |
Statement of Responsibility: | Con J. Doolan, Danielle J. Moreau |
Abstract: | The sound generated by a turbulent boundary layer with a smaller two-dimensional step was investigated and related to the perturbed flow field via a new scaling law. Experimental results were obtained using two types of sub-boundary layer steps (rectangular and triangular). Flow visualisation revealed an upstream separation zone and a downstream reattachment point. The sub-boundary layer steps, in general, resulted in a rapid thickening of the shear flow near the wall. The integral boundary layer results show the effect of the steps on the boundary layer can be likened to a disturbance followed by a boundary layer re-establishment region. The noise data revealed the nature of the noise created by the steps. The steps can be considered as acoustically compact (height much less than acoustic wavelength) and radiate noise in both streamwise and cross stream directions, suggesting the existence of compact superimposed dipole sources. The shape of the step has a large effect on the noise level, suggesting the front surface of the step has a dominant role in noise production. A new scaling law based on the perturbed boundary layer height was able to successfully collapse the noise data. |
Keywords: | Sub-boundary layer step; flow-induced noise |
Description: | Available online 11 November 2015 |
Rights: | © 2015 Elsevier Inc. All rights reserved. |
DOI: | 10.1016/j.expthermflusci.2015.10.024 |
Grant ID: | http://purl.org/au-research/grants/arc/LP110100033 |
Published version: | http://dx.doi.org/10.1016/j.expthermflusci.2015.10.024 |
Appears in Collections: | Aurora harvest 3 Mechanical Engineering publications |
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