MOMENTUM TRANSPORT IN TURBULENT FLOW WITH TWO-DIMENSIONAL STRUCTURE OF PERTURBATIONS IN THE REGION OF UNIFORM SHEAR.

For the investigation of turbulence with two-dimensional turbulent shear, flows were realized in laboratory conditions in which energy transport was observed upward along the spectrum, i. e. , into increasingly larger scales right up to the mean flow. A momentum transport was accomplished from regions with smaller velocity into regions with larger velocities. It was shown that such transport can be explained on the basis of the concepts of the change of the turbulence structure. It will be shown here that sometimes it is possible to estimate the total energy transport in the energy balance equation from experimental results. The basic results of the investigation of the flow in a strong transverse magnetic field B equals 1T in the section x equals 260 mm are presented, where a homogeneous shear was obtained and a well-developed two-dimensional flow was realized. The two-dimensional structure of the turbulence is indicated by the fluctuation and correlation measurements.