RT Journal Article ID 617b48db24055f71 A1 Repik, Yevgenii Ustinovich A1 Inshakov, Ivan Sergeevich T1 GRID INFLUENCE ON AIR FLOW NON-UNIFORMITY IN WIND TUNNELS JF TsAGI Science Journal JO TSAGI YR 2014 FD 2015-06-05 VO 45 IS 8 SP 669 OP 696 K1 experimental investigation K1 non-uniform flow field K1 non-uniform flow field generator K1 grids K1 turbulence grids K1 vortex structure destroyer K1 velocity profiles K1 turbulence level AB The experimental results of the influence of fine-scale turbulence generated by the grids and vortex structure destroyer (VSD) on an inhomogeneous flow field in a wind tunnel are presented. It is shown that the application of turbulence grids leads to the dependence of the smoothing rate of non-uniform velocity profiles and the turbulence level on the grid cell size. In particular, the installation of a finemeshed grid results in a slower rate of smoothing of the non-uniform velocity profiles and velocity fluctuations compared with the case without the grid. An optimal ratio between the cell size and the scale of inhomogeneity, at which the most efficient equalizing of the flow field inhomogeneity takes place, is found. When the VSD is installed in the large transverse gradient zone of the turbulence level, the rate of equalizing this gradient is significantly diminished due to a skin friction decrease in the turbulent boundary layer. PB Begell House LK https://www.dl.begellhouse.com/journals/58618e1439159b1f,4b19450c62a05278,617b48db24055f71.html