Abstract
A group of streamwise vortices in the near wall region of turbulent boundary layer are introduced by a group of parallel longitudinal heating wires to control the multi-scale eddy structures in wall turbulence. The relations between the introduced streamwise vortices and the multi-scale eddy structures in wall turbulence are studied. The influence of introduced streamwise vortices on multi-scale eddy structures in wall turbulence is analyzed by wavelet transform. The integrated kinetic energy of eddy structures at each scale is enhanced by the parallel heating wires. The characteristic time scales of different size eddy structures are changed by the introduced streamwise vortices.
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