Abstract
Effect of spanwise perturbation was experimentally investigated in the interaction process between a turbulent boundary layer and a common-flow down type streamwise vortex pair introduced from the free stream. The perturbation was added by spanwise oscillation of a delta wing at two different frequencies of 0.5Hz and 1.OHz. The mean velocity and Reynolds stress profiles were measured along the symmetrical planes at the center between the two vortices. The spanwise perturbation produces inflectional point in the mean velocity profile and peaks in the turbulent intensity profile. The peak values is slightly increased in the u_<rms>/U_1, profile but is slightly decreased in the v<rms>/U_1 profile over the range of Δx/d_0=10-50.
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