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Article

Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications

AWEP Department, Delft University of Technology, 2629 HS Delft, The Netherlands
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Appl. Sci. 2019, 9(15), 3119; https://doi.org/10.3390/app9153119
Received: 27 June 2019 / Revised: 20 July 2019 / Accepted: 24 July 2019 / Published: 1 August 2019
(This article belongs to the Special Issue Acoustic Metamaterials, Applications in Engineering)
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 × 105 and 3.14 × 105 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. View Full-Text
Keywords: porous materials; turbulent boundary layer trailing edge noise; microphone array; flow resistivity porous materials; turbulent boundary layer trailing edge noise; microphone array; flow resistivity
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MDPI and ACS Style

Mayer, J.; Rubio Carpio, A.; Ragni, D. Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications. Appl. Sci. 2019, 9, 3119. https://doi.org/10.3390/app9153119

AMA Style

Mayer J, Rubio Carpio A, Ragni D. Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications. Applied Sciences. 2019; 9(15):3119. https://doi.org/10.3390/app9153119

Chicago/Turabian Style

Mayer, Jonathan, Alejandro Rubio Carpio, and Daniele Ragni. 2019. "Temperature-Activated Change of Permeable Material Properties for Low-Noise Trailing Edge Applications" Applied Sciences 9, no. 15: 3119. https://doi.org/10.3390/app9153119

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