A large-scale anechoic continuous wind tunnel noise research facility with a big diameter free-jet test chamber. Up to 3 m open-jet test section.
Low-speed flows up to Mach 0.38 (approach and take-off).



CEPRA19 is an open circuit wind tunnel with the following major components :

  • A 9 x 9 m (29.5 x 29.5 ft) inlet featuring a dust filter, acoustic baffles, anti-turbulence screens and a honeycomb.
  • A contraction with an inlet diameter of 9 m (29.5 ft) and a nozzle exit diameter of 3 m or 2 m (9.8 or 6.6 ft).
  • An anechoic chamber (test section) in the shape of roughly a quarter of a sphere, with an internal radius of 9.6 m (31.5 ft).
  • A flow collector.
  • A diffuser.
  • A fan silencer.
  • A centrifugal fan driven by a 7 MW asynchronous electric motor.


  • High quality continuous airflow at up to 130 m/s (426 fps).
  • Very good anechoicity (minimised noise reflections), and low background noise in the 200 Hz to 80 kHz frequency bandwidth.
  • Aircraft models up to 1/11th scale tested.
  • Nozzle model diameters up to 30 cm (1.0 ft) tested, with a total continuous massflow up to 12 kg/s (26.4 lb/s) possible.
  • Nozzle primary jet temperature can be raised to 1150 K (877°C) thanks to a 3 MW propane burner, and the secondary jet up to 500 K (227°C) by the heat of compression only.
  • Far-field and near-field noise and flow-field measurements with an assortment of arrays and antenna, in a large anechoic chamber.


Nozzle test in CEPRA19

  • Jet noise (hot or cold) with both isolated and installed configurations.
  • Fan noise using TPS with both isolated and installed configurations.
  • Airframe noise (High lift Devices noise, landing gear noise ...).
  • Automotive noise.
  • Industrial aeroacoustics.