Prediction of Condensation Onset and Growth in the European Transonic Wind Tunnel ETW,
DORNIER G M B H FRIEDRICHSHAFEN (GERMANY F R)
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Experimental and theoretical investigations were carried out to allow reliable prediction of condensation onset and growth in cryogenic wind tunnels. The idea of streamline duplication was used in the experiments in order to simulate ETW-streamlines in an experimental facility of small cross section but with real ETW length scale. Classical nucleation theory was used for developing computer programs which can predict condensation processes in one dimensional flow including real gas effects. Experiments and calculations show satisfactory agreement and confirm the possibility of an operating range extension for the ETW. The results provide some new data with respect to those cases where the condensate consists of solid particles.