Wind Tunnel Test of Effect of Sound-Absorbing Material on Lift of Two-Element Airfoil

Abstract:

The flow parameters of fluctuating pressure and fluctuating velocity in the gap can be changed by the porous absorption material on the leading edge of upper surface of the flap of multi-element airfoil (GAW-1),and the aerodynamic characteristics is also altered. Experiment was conducted in the NF-3 wind tunnel. It turns out that porous absorption material has a significant effect on fluctuating velocity (i.e. turbulent kinetic energy), and the lift coefficient drops when fluctuating velocity increases ; but the influence on RMS of fluctuating pressure on upper surface is not obvious; the average speed in gap is reduced. The PSD of fluctuating pressure and fluctuating velocity show that low-frequency signal has a more obvious influence on lift of multi-element airfoils than high-frequency.

• Periodical: Advanced Materials Research (Volume 830)
• Pages: 17-23
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.830.17
• Online since: October 2013
• Authors: Yong Wei Gao, Qi Liang Zhu*, Long Wang
• Keywords: Fluctuating Pressure, Fluctuating Velocity, Gap Flow, Multi-Element Airfoil, Sound-Absorbing Material

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