Aerodynamic Tunnel

General data

Carlos III University of Madrid
UC3M Subsonic Tunnel

Address: 30 University Avenue - Leganés - CP 28911

Contact person: Stefano Discetti  -   email:



Closed circuit tunnel, with closed test chamber of rectangular section. The test chamber has 3 transparent walls in polymethylmethacrylate (PMMA), making it perfectly suitable for the application of optical measurement techniques. Two of the three PMMA walls can be replaced with walls equipped with windows for infrared applications, allowing infrared thermography to be used easily.

Speed range

The wind tunnel provides a stabilized flow in the test chamber with a velocity in the range between 1 and 20 m/s and a turbulence intensity of less than 1%.

Test Section

The wind tunnel has a test chamber with a cross-sectional area of 40 cm x 40 cm and 1.5 m in length.

Instrumentation for force and moment measurement

Load cells and high resolution 6-axis balance (1/341N)

Instrumentation for pressure measurement

64-port Scanivalve with 160 Pa full scale (0.25% full scale accuracy). Simultaneous acquisition up to 1000Hz equivalent.

Flow velocity measurement instrumentation

Dantec StreamLine Pro CTA anemometer system with 6 independent channels and several Dantec hot-wire and hot-film probes. Tomographic IVP system consisting of 4 Andor Zyla CMOS scientific cameras with 5.5 megapixel resolution and 2 sets of 4 identical lenses with short and long focal length (50 mm and 100 mm), allowing experiments with different resolutions. The unit is also equipped with a fully open 8-channel high-precision signal generator, which allows direct external activation and synchronization with other systems (infrared camera, hot wire, etc.). The group has one of the few non-commercial software for tomographic IVP and software for planar and stereoscopic IVP. Two Quantel Evergreen pulsed lasers, capable of generating double pulses with 200 mJ of energy per pulse at 15 Hz. In addition, continuous lasers up to 5W are available for time-resolved testing.

Instrumentation for aeroelastic testing


Atmospheric boundary layer simulation capability

Boundary layer experiments have been carried out in this tunnel with Reynolds number based on friction of order 1000 ( The boundary layer thickness is typically 3-4cm.

Minimum turbulence intensity(%)


Flow visualization methods

Visualization with smoke Quantitative visualization with Particle Image Velocimetry Visualization with neuromorphic camera (event-based velocimetry) Quantitative surface temperature visualization with infrared thermography

Tunnel test model building capability

For the manufacture of small parts and models, the following are available: - a Formlabs Form3 LFS resin 3D printer (print volume 145x145x185mm, resolution 0.025 mm), compatible with standard or special application resins; - an FDM technology 3D printer with Raise3D Pro2Plus dual extruder (305 x 305 x 605 mm3 print volume, 0.05 mm resolution) compatible with ABS, PLA or Nylon; - 3 FDM Ender-3 technology 3D printers (220 x 220 x 250 mm3 print volume, 0.1 mm resolution) compatible with ABS, PLA or Nylon; - an Ultimaker 2+ FDM 3D printer (223 x 223 x 205 mm print volume and precision finishing up to 60 micron) in various plastic materials (PLA, ABS, CPE, CPE+, PC, Nylon, TPU 95A); - a Zprint 650 ceramic powder 3D printer (print volume of 254 x 381 x 203 mm with a minimum resolution of 0.1 mm). The aerospace design lab is also equipped with a small milling machine, which can be used to build metal and plastic parts. The Aerospace Engineering Department's manufacturing capabilities are complemented by the University's central services.


Additional information

Link to additional tunnel documentation

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