Using Interferometric Measurements in Calculation of Aerodynamic Forces
It is very difficult to assess unsteady force effects on a profile without direct force measurements. Even results of pneumatical and optical measurements are biased by additional errors in comparison with measurements of steady flows. In the paper presented attempt is made to estimate erroes arising during evaluation of interferogrammes of transonic instability taken by a high-speed camera . The flow field of incoming stream is uniform and time flow changes, at which oscillating movement of terminal shock wave of supersonic region takes place, are almost exceptively limited in the field near airfoil. It is confirmed by a streak photography taken through.75 mm slit and presented in Fig. 1.
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