This article is cited in 17 papers

Effect of porous coatings on stability of hypersonic boundary layers

A. N. Shiplyuk, E. V. Burov, A. A. Maslov, V. M. Fomin

Institute of Theoretical and Applied Mechanics, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090

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 $\mathrm{M} = 5.95$ on sharp cones with a $7^\circ$ 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.

Keywords: hypersonic flows, boundary layer, laminar–turbulent transition, stability, ultrasound-absorbing coatings.

UDC: 532.526

Received: 19.11.2003

 English version: Journal of Applied Mechanics and Technical Physics, 2004, 45:2, 286–291

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