General Arrangement

The ULg wind tunnel features two different test sections and two interchangeable nozzles. Each test section can operate in open or close configuration and is equipped with a rotating test table.

Schematic view of the wind tunnel

Conversion of the wind tunnel to open circuit mode

Aeronautic/Automobile test section (TS1)

This test section is used for models with a frontal area lower than 0.3m2. The front and top walls of TS1 are made of perspex panels to allow good visibility and use of flow visualization procedures.

General characteristics of TS1

TS1 Dimensions 2m x 1.5m x 5m (Width x Height x Length)
Airspeed Range Closed loop: 2-65m/s
Open loop: 2:40m/s
Test section turntable Diameter: 1.5m, Rotation range: ±90o
Thermal stability ~1oC
Streamwise static pressure gradient 0.3% per meter
Mean angle divergence < 0.2%
Speed non-uniformity < 0.5%
Turbulence level 0.15%

Boundary layer suction

TS1 is equipped with a boundary layer suction device, which sucks the boundary layer in the vicinity of the wind tunnel floor and reintroduces it downstream of TS1. The objective is to keep the incoming airflow near the ground as uniform as possible. The main application of this set-up is automobile tests (ground effect). A schematic view is presented below.

Boundary layer suction device

Wind engineering test section (TS2)

This test section is used for civil engineering (e.g. complete scaled buildings, bridges,...) and wind engineering (dispersion of pollutants, air flow in urban environments). TS2 can be used with the standard nozzle containing TS1 or with the Atmospheric Turbulence Generation Nozzle. TS2 is also used for applications requiring bigger test models (such as wind turbines) with frontal areas that can reach up to 0.45m2

General characteristics of TS1

TS2 Dimensions 2.5m x 1.8m x 5m (Width x Height x Length)
Airspeed Range Closed loop: 2-40m/s
Open loop: 2:30m/s
Test section turntable Diameter: 2m, Rotation range: ±180o
Thermal stability ~1oC
Streamwise static pressure gradient 0.5% per meter
Mean angle divergence < 0.2%
Speed non-uniformity < 0.8%
Turbulence level 0.23%

Atmospheric boundary layer

The atmospheric boundary layer can be simulated by placing obstacles upstream of TS2 in the Atmoshperic Boundary Layer Generation nozzle. This nozzle, which has a length of 12m, can completely replace the TS1 working section. Two pictures of a particular wooden block setup is presented below.

Two views of the Atmoshperic Boundary Layer Generation nozzle

Adjustable ceiling

TS2 is also equipped with an adjustable ceiling allowing the reduction of the streamwise pressure gradient in the working section. This reduction is important for the simulation of a constant-profile atmospheric boundary layer, as used in tests on urban or industrial complex models. A diagram of the system is shown below.

Adjustable ceiling device