Measurements of the Two-point Autocorrelation and Spectral Shear Correlation Coefficients in a Perturbed Turbulent Boundary Layer

O. M. Oyewola

Chinese Journal of Physics

43卷6期（2005 / 12 / 01）

1058 - 1065

英文

Measurements of the two-point autocorrelation and spectral shear correlation coefficients have been made in a turbulent boundary layer subjected to a concentrated suction, applied through a porous wall strip. The results indicate that suction weakened the near-wall structures, as reflected in the changes in the autocorrelation coefficients relative to those for non-suction. Due to the stabilization of the near-wall flow by suction, the spanwise size of the initial structures is diminished. The changes in the large-scale motion of the suction and no suction is felt down to the smallest scales, as observed in the lack of collapse of the spectral shear correlation coefficient.