The Use of a Water Towing Tank for Aerodynamic Testing and Methods for Quantitative Evaluation of Photographs,
DEUTSCHE FORSCHUNGSANSTALT FUER LUFT- UND RAUMFAHRT EV GOETTINGEN (GERMANY F R) INST FUER AEROELASTIK
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The use of the water towing tank of the DFVLR for fluid dynamic testing is briefly described. The capability of measuring techniques is discussed. Among the various techniques the quantitative evaluation of photographs of visualized flow proved to be the most effective for the use in a water towing tank. Two methods enabling the survey of three-dimensional flow fields are dealt with in detail. The first method based on photogrammetric techniques has already been applied to the investigation of three-dimensional disturbances in an unstable laminar boundary layer and to the study of a free vortex flow. The second one is based on holographic techniques. Its feasibility for supplying quantitative data is discussed.