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STREAMWISE VARIATION OF TURBULENT DYNAMICS IN BOUNDARY LAYER FLOW WITH DRAG-REDUCING SURFACTANT INJECTION

Shinji Tamano
Graduate School of Engineering, Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan

Takuya Kitao
Graduate School of Engineering Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan

Yohei Morinishi
Graduate School of Engineering Nagoya Institute of Technology Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan

Abstrakt

We investigated the difference in streamwise variations of turbulent dynamics between homogeneous and heterogeneous (injected) nonionic surfactant solutions using the flow visualization and two-component LDV and PIV measurements in drag-reducing turbulent boundary layer flows. It is found that streamwise variations in turbulence statistics for surfactant solution injection are similar with those of homogeneous surfactant solutions, except for the streamwise turbulence intensity and Reynolds shear stress.