University of Oxford Hypersonics Group Low Density Tunnel Facility
20 Nov 2018





The Low Density Tunnel (LDT) is rarefied flow facility, with the ability to produce flows with high Knudsen numbers representative of those experienced in the slip regime. The facility is continuous and is capable of measuring aerodynamic coefficients by use of a magnetic suspension balance. The tunnel has a 0.18 m diameter. Flow visualisation is via high speed Schlieren imaging, hot films, and thermographic liquid crystal.


  • Knudsen numbers up to 0.3
  • Max p0 = 200 kPa
  • Max T0 = 600 K
  • Contoured Mach 6 nozzle, 30-60 mm core flow
  • Mach 5-10 conical nozzle with 20-50 mm core flow
  • Magnetic force balance
  • 2-axis wake traverse
  • 3-axis traverse for model re-orientation

Oxford  Low Density Wind Tunnel Facility
​This facility is part of the National Wind Tunnel Facility partnership.