Abstract
As the speed of aeroplanes has increased into the transonic regime, it has not been possible to test aerodynamic models in conventional wind tunnels at Reynolds numbers equivalent to those achieved in flight. The cryogenic wind tunnel, in which liquid nitrogen is injected into the tunnel circuit and evaporates to give a gas temperature of approximately 80 K, has removed this restriction, but brought with it the complexities of operation at cryogenic temperatures. The proceedings of AGARD Lecture Series No. 1111 covers in detail most aspects of cryogenic wind tunnel operation and, in particular, the papers by Wigley2 and Kilgore3 deal with the properties of materials and construction of aerofoil models, respectively. Furthermore, the factors to be considered in choosing materials for the construction of the pilot models for the National Transonic Facility (NTF), currently nearing completion at the NASA Langley Research Center, are discussed in detail in a National Bureau of Standards (NBS) report by Tobler.4
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