Abstract
The effect of leading edge serrations on the surface pressure fluctuation spectra and boundary layer qualities of a NACA 0012 airfoil has been investigated experimentally, with an emphasis on reducing airfoil separation and stall noise. Five leading edge serration add-ons with various serration heights and wavelengths have been tested in conjunction with a highly instrumented NACA 0012 airfoil. It is shown that all serrations cause a significant increase in surface pressure fluctuation spectra in the pre-stall region. However, for angles of attack in the post-stall regime, surface pressure fluctuation spectra reductions of up to 15dB have been observed for some serrations. These surface pressure fluctuation spectra reductions have been linked to the changes observed in the complex flow-field near the trailing edge, namely boundary layer thickness and velocity fluctuation reductions, as a result of the counter-rotating vortex pairs generated by the respective serrations.
Original language | English |
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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 | 5373-5380 |
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 |
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Publisher | DEGA e.V. |
ISSN (Print) | 2226-7808 |
Conference
Conference | 23rd International Congress on Acoustics |
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Abbreviated title | ICA 2019 |
Country/Territory | Germany |
City | Aachen |
Period | 9/09/19 → 13/09/19 |
Internet address |
Keywords
- leading edge serrations
- separation and stall noise
- flow control
- surface pressure fluctuations
- trailing edge noise