Abstract
Stall and separation noise can be major contributors to the noise emission of rotating blades, such as wind turbines, propellers and fans among others. Hence, this paper experimentally investigates the effects a separated boundary layer has on near-field flow structures, on turbulent surface pressure fluctuation statistics, and therefore on noise radiation. Static pressure distributions and boundary layer profiles are presented to characterize the present flow fields pre- and post-stall. Large surface pressure fluctuation spectra increases have been measured, and surface pressure fluctuation autocorrelation width increases by one order of magnitude during stall have been established. Additionally, highly coherent spanwise structures have been shown to influence the hydrodynamic field and changes in the convection velocity have been assessed for separated boundary layers.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019 |
| Editors | Martin Ochmann |
| Publisher | DEGA e.V. |
| Pages | 5421-5428 |
| Number of pages | 8 |
| ISBN (Print) | 9783939296157 |
| Publication status | Published - 9 Sept 2019 |
| Event | 23rd International Congress on Acoustics - Eurogress Aachen, Aachen, Germany Duration: 9 Sept 2019 → 13 Sept 2019 http://www.ica2019.org/ |
Publication series
| Name | Proceedings of the ICA AND EAA EUROREGIO |
|---|---|
| Publisher | DEGA e.V. |
| ISSN (Print) | 2226-7808 |
Conference
| Conference | 23rd International Congress on Acoustics |
|---|---|
| Abbreviated title | ICA 2019 |
| Country/Territory | Germany |
| City | Aachen |
| Period | 9/09/19 → 13/09/19 |
| Internet address |