Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications
The present work analyses broadband noise scattering from permeable trailing edges with identical micro-structure but under a change of temperature. Experiments are performed in an anechoic wind tunnel using a NACA0018 airfoil at chord-based Reynolds numbers between 1.88 × 10<sup>5<...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-08-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/9/15/3119 |
| _version_ | 1818055701809856512 |
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| author | Jonathan Mayer Alejandro Rubio Carpio Daniele Ragni |
| author_facet | Jonathan Mayer Alejandro Rubio Carpio Daniele Ragni |
| author_sort | Jonathan Mayer |
| collection | DOAJ |
| description | The present work analyses broadband noise scattering from permeable trailing edges with identical micro-structure but under a change of temperature. Experiments are performed in an anechoic wind tunnel using a NACA0018 airfoil at chord-based Reynolds numbers between 1.88 × 10<sup>5</sup> and 3.14 × 10<sup>5</sup> and no incidence. A microphone array is used to determine far-field sound pressure level changes upon trailing edge heating. It is found that broadband noise emission can be actively controlled by varying the temperature of the porous trailing edge inserts. Specifically, the electrically heated inserts yield a noise level variation of up to 2.5 dB with the heated one being noisier compared to a baseline, unheated material with similar micro-structure. Resistivity measurements of permeable samples with varying temperature show that flow resistivity increases with the fluid temperature which is in agreement with the reported trailing edge noise increase. |
| first_indexed | 2024-12-10T12:17:08Z |
| format | Article |
| id | doaj.art-2804901e84624edab11039d3c1ce435d |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-10T12:17:08Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-2804901e84624edab11039d3c1ce435d2022-12-22T01:49:11ZengMDPI AGApplied Sciences2076-34172019-08-01915311910.3390/app9153119app9153119Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge ApplicationsJonathan Mayer0Alejandro Rubio Carpio1Daniele Ragni2AWEP Department, Delft University of Technology, 2629 HS Delft, The NetherlandsAWEP Department, Delft University of Technology, 2629 HS Delft, The NetherlandsAWEP Department, Delft University of Technology, 2629 HS Delft, The NetherlandsThe present work analyses broadband noise scattering from permeable trailing edges with identical micro-structure but under a change of temperature. Experiments are performed in an anechoic wind tunnel using a NACA0018 airfoil at chord-based Reynolds numbers between 1.88 × 10<sup>5</sup> and 3.14 × 10<sup>5</sup> and no incidence. A microphone array is used to determine far-field sound pressure level changes upon trailing edge heating. It is found that broadband noise emission can be actively controlled by varying the temperature of the porous trailing edge inserts. Specifically, the electrically heated inserts yield a noise level variation of up to 2.5 dB with the heated one being noisier compared to a baseline, unheated material with similar micro-structure. Resistivity measurements of permeable samples with varying temperature show that flow resistivity increases with the fluid temperature which is in agreement with the reported trailing edge noise increase.https://www.mdpi.com/2076-3417/9/15/3119porous materialsturbulent boundary layer trailing edge noisemicrophone arrayflow resistivity |
| spellingShingle | Jonathan Mayer Alejandro Rubio Carpio Daniele Ragni Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications Applied Sciences porous materials turbulent boundary layer trailing edge noise microphone array flow resistivity |
| title | Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications |
| title_full | Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications |
| title_fullStr | Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications |
| title_full_unstemmed | Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications |
| title_short | Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications |
| title_sort | temperature activated change of permeable material properties for low noise trailing edge applications |
| topic | porous materials turbulent boundary layer trailing edge noise microphone array flow resistivity |
| url | https://www.mdpi.com/2076-3417/9/15/3119 |
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