Abstract
The possibility of reproducing the wind direction fluctuation is studied by a new type wind tunnel, which is called as a fluctuating wind direction tunnel (FWDT). The FWDT consists of eight inflow and eight outflow wind ducts with shutters, which are radiately located around the test section. By opening only one or two sets of inflow and outflow ducts, wind blows in that direction. Now this FWDT is installed with 10 shutters that can be controlled by a computer, and 90 degree wind direction change can be made at most. Wind characteristics in FWDT and the best shutter opening and closing timing with smaller wind speed fluctuations during the wind direction change were studied. Better shutter timings were found to be that with the simultaneous closing and opening of the inflow ducts of the pre- and post- wind direction change.
