抄録
A nearly two-dimensional linear shear flow is generated in the test-section of a wind tunnel by inserting a grid of parallel rods with various spacing. The different four velocity gradients are produced by the four grids. The grid design is based on the analysis by OWEN & ZIENKIEWICZ. In the ordinary turbulent flow Reynolds stress keeps nearly constant with the distance from the grid.
On the other hand in the turbulent shear flow that keeps almost constant or increases slightly. The increment becomes larger with the velocity gradient. The turbulence intensity, velocity gradient and the integral scale which characterizes the size of the eddy, increase with Reynolds stress. Therefore Reynolds stress appears to play the leading part in the flow. The frequency of the turbulence covers wide range. The probability density function of the turbulence is transformed its form slightly from the normal distribution. Consequently the turbulence seems to be a sort of random variation which is latently periodic.
