Aircraft Research Association

ARA

Cryogenic Models

cryomodel

Models for the ETW and NTF high Reynolds number cryogenic wind tunnels have to be manufactured from exotic high tensile steel to withstand the loads generated at cryogenic test conditions and also require a surface finish much better than models for the ARA tunnel (Ra = 0.1 to 0.2 µm). ARA has been at the forefront of material, tool and technique development and model design and manufacture of cryogenic models, including the following highlights;

  • 1989: 5 year technology programme to investigate design and manufacture issues (e.g. steels, fasteners, tools, bonding and seal materials)
  • 1994: Design and manufacture of the ETW reference model with no external fasteners and support sting
  • Design and manufacture of the ETW half model balance, turntable and thermal controls
  • 2004: Design and manufacture of a complex, high lift semi-span model for the ETW and NTF
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