Aerodynamic Flow Control by Thermoacoustic Excitation from the Constituent Nanomaterialson the Platform Surface

Report No. ARL-TR-7598
Authors: Bryan Glaz
Date/Pages: February 2016; 34 pages
Abstract: Thermoacoustic excitation from carbon nanotube thin films was explored as a potential aerodynamic flow control approach. More broadly, the fundamental physics of the proposed direct turbulence dissipation scale (i.e., Kolmogorov scale) forcing was studied. Initial attempts to force a turbulent shear layer in the Kolmogorov scale did not exhibit noticeable differences from the baseline unforced system. Based on theoretical derivations, we hypothesized that the lack of coupling between the organized wave and the turbulence was due to low initial turbulent kinetic energy and low forcing amplitude. A new turbulent jet was designed and characterized with an order of magnitude higher turbulent kinetic energy. This system will be forced with high-amplitude piezoelectric transducers in future work to finalize the study of Kolmogorov scale forcing first proposed in the Director's Research Initiative.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 2016