An investigation of turbulence structure in a low-Reynolds-number incompressible turbulent boundary

摘要

An existing high turbulence intensity level (5) atmospheric boundary-layer wind tunnel has been successfully converted to a relatively low level turbulence (0.3) wind tunnel through extensive modification, testing, and calibration. A splitter plate was designed, built, and installed into the wind-tunnel facility to create thick, mature, two-dimensional turbulent boundary layer flow at zero pressure gradient. Single and cross hot-wire measurements show turbulent boundary layer characteristics of good quality with unusually large physical size, i.e., viscous sublayer of the order of 1 mm high. These confirm the potential ability of the tunnel to be utilized for future high-quality near-wall turbulent boundary layer measurements. It compares very favorably with many low turbulence research tunnels.