每年出版 6 期
ISSN 打印: 2152-5102
ISSN 在线: 2152-5110
Indexed in
Combined Effect of Short Roughness Strip and Concentrated Wall Suction on Coherent Structure in a Turbulent Boundary Layer
摘要
Hot-wire measurements have been undertaken in a turbulent boundary layer in order to examine the combined effect of short roughness strip and localized wall suction on near-wall coherent structures. The short roughness strip is placed immediately after the suction strip and the suction is applied through a short porous strip for a range of suction rates. The results of Reynolds stresses indicate that the pseudo-equilibrium of the organized motion of the layer have been altered due to the suppression of the near-wall coherent structures. This is evident in the attenuation of the spectra and co-spectra relative to the undisturbed layer. Although, short roughness strip altered the magnitude and wavelength of the effect of suction on the layer, the results suggest that the short roughness strip and suction act independently on the mechanism of the layer.