Basic performance of the boundary layer wind tunnel belonging to Housing and Urban Development Corp

A closed circuit type boundary layer wind tunnel has been constructed at Hachiohji Laboratory, Housing and Urban Development Corp., It is the multipurpose wind tunnel which can be used for many researches on wind engineering. The working section of the wind tunnel is 2.1m in height, 2.8m in width and 17.5m in length. The range of wind speed is from 0.5 to 30.0m/s and the uniformity of mean wind speed and the turbulence intensity in the working section are within ±1.0%, 0.3% respectively. The characteristics of the boundary layer flow made by spires and roughness blocks in the wind tunnel are also described in this paper.