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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...