| Conventionally, grids composed of bars or stripes have been used to a great extent in the experimental studies of isotropic turbulence. Perforated plates are utilized instead of grids in the present study.;A perforated plate was placed at the entrance of the test section of a wind tunnel. The turbulent flow downstream of the plate was measured using a constant temperature hot-wire anemometer in conjunction with a single normal and a single inclined hot-wire. Measurements were conducted for nine different operating conditions which consisted of planes at three downstream distances and three flow rates. Each plane contained eighty-one measuring locations. At each location, three measurements were taken, one with the single normal hot-wire probe, the other two with the single inclined hot-wire probe. Nine different plates were tested. The total number of measurements was 19,683. The signal from single normal hot-wire probe was processed to obtain the turbulence root mean square (rms) velocity in the streamwise direction, u '. The turbulence integral length scale based on the Taylor's frozen turbulence hypothesis was obtained from the signal of single normal probe. The turbulence rms velocity in the lateral direction, v ', was obtained by combining u' with the processed result from the single inclined probe. (Abstract shortened by UMI.). |
