In the context of an overall development of transonic, cryogenic wnd tunnel technology, NASA has been investigating the onset of condensation effects in nitrogen gas. The temperature at which condensation occurs determines the minimum operating temperature (MOT) of cryogenic tunnels. The apparatus and airfoils are discussed, taking into account a description of the 0.3-m Transonic Cryogenic Tunnel (TCT), the drag rake, the airfoils, and the technique used for determining the onset of condensation effects. Attention is also given to the types of nucleation processes, the relative sensitivity of drag rake and surface pressure measurements, correlations between data and theory, the prediction of minimum operating temperatures for the 0.3-m TCT, and MOT's for different tunnels.


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    Title :

    Studies of Condensation Effects on Airfoil Testing in the Langley 0.3-Meter Transonic Cryogenic Tunnel


    Contributors:
    R. M. Hall (author)

    Publication date :

    1986


    Size :

    34 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English