Abstract
Spatial structure of turbulent drag reducing flow with blowing polymer solution from the channel wall has been investigated by using PIV. The instantaneous velocity fields in x-z plane were measured in the near-wall region. In this experiment, 10.6 % of drag reduction was obtained under Re=20000. As a result of PIV measurement, RMS of streamwise velocity fluctuation increases and spanwise velocity fluctuation decreases. In the drag reducing flow with blowing polymer solution, low-speed streaks spaces expanded to the spanwise direction with increasing streak thickness. This phenomenon was also analyzed quantitatively by a two-point cross-correlation coefficient. In addition, small scale component in the velocity fluctuation decays and large scale component is dominant with drag reduction effect.
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