A wind tunnel was constructed to study the effects of thermal stratification on flow and diffusion in the atmospheric boundary layer. The wind tunnel is of a suction type and has a 1.5 m wide, 1.2 m high, 13.5 m long, rectangular test section. Designed to produce thermally stratified flows, the tunnel is equipped with two independent temperature systems, an air-flow heating unit (AHU) and a floor temperature controlling unit (FTCU). Using the AHU and FTCU, a wide range of thermal stratification can be generated with a wind speed in the range of (U =) 0.2-2.0 m s-1. Both in neutral and stably stratified flows, the tunnel can provide a uniform smooth flow with a low turbulence intensity of about 0.4% at a wind speed less than 1 ms-1. The design features and performance of the wind tunnel are described. The characteristic of thermally stratified flows created in the test section is also discussed.
All Science Journal Classification (ASJC) codes
- Environmental Science(all)
- Atmospheric Science