Design of NK-1 type movable wind erosion tunnel body

Aimed at the study on soil wind erosion, the movable wind erosion tunnel called NK-1 was designed based on the aerodynamic theory. It is composed of inlet section, drive section, transition section, turning segment, setting chamber, contractive segment, test section and diffusion section. It’s total length and height are 15 900 and 2 456 mm. The energy ratio is 0.41. The wind tunnel has some features which are expressed as the following aspects: the inlet lip curve is involute; there is a windward elevation angle of 20° in the turning segment; the setting chamber is embedded a steel hexagon honeycomb assembly and two steel sieves. The wind speed of the test section can be adjusted smoothly by a frequency actiyator within the speed range of 0.3-20 m/s. Divergence angle of 20° was designed for diffusion section. The fluid simulation software-Fluent 6.3 was applied to simulate static pressure and velocity distribution along longitudinal section in whole test section. The results indicate that the velocity and static pressure distribution of air current in test section can meet design requirements.