Abstract
The influence of ultrasound‐absorbing coatings on stability of hypersonic boundary layers is considered. Two types of coatings were used in experiments: felt‐metal with a random porous microstructure and a sheet perforated by blind cylindrical microchannels. The experiments were performed in a wind tunnel at a Mach number M = 5.95 on sharp cones with a 7° apex half‐angle. Evolution of natural disturbances and artificially induced wave packets in the boundary layer was studied with the help of hot‐wire anemometry. Spatial characteristics of artificial disturbances were obtained. It is demonstrated that such coatings exert a stabilizing effect on second‐mode disturbances.
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Shiplyuk, A.N., Burov, E.V., Maslov, A.A. et al. Effect of Porous Coatings on Stability of Hypersonic Boundary Layers. Journal of Applied Mechanics and Technical Physics 45, 286–291 (2004). https://doi.org/10.1023/B:JAMT.0000017593.33499.c4
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DOI: https://doi.org/10.1023/B:JAMT.0000017593.33499.c4