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There are several occasions when the properties of the flow are wanted to be investigated around the cross section of the wind tunnel. The first method which can be applied is PIV (Particle Image Velocimetry) which investigates the parameters of the flow in a discrete time. On the other hand the second type of the most popular techniques is LDA (Laser Doppler Anemometry) which can be used when the flow is wanted to be measured with respect to time. We used LDA method in a subsonic wind tunnel in order to investigate the velocity distribution in case of four different main velocities which can be modified by an axial fan. From the results conclusions will be drawn which will be used in further measurements.

Szubszonikus szélcsatornában kialakuló sebességeloszlás mérése LDA technika alkalmazásával