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Thermophysics and Aeromechanics

2002 year, number 1

An experimental study of swept-wing boundary layer receptivity: 1. Surface vibrations

V.R. Gaponenko, A.V. Ivanov, and Y.S. Kachanov
Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Pages: 55-72


The generation of crossflow instability waves in a swept-wing boundary layer by wing-surface vibrations is experimentally studied. For various disturbance frequencies, the excitation of wave trains of vibration-induced disturbances and their further development in the boundary layer are quantitatively examined. Following a Fourier decomposition of the wave trains into normal three-dimensional modes, the spectral amplitudes of various instability modes were compared with the amplitudes of respective spectral surface-vibration components. As a result of the study, complex-valued receptivity coefficients were obtained for various disturbance frequencies as functions of spanwise wavenumber, which turned out to be independent of the particular shape of surface vibrations.