Fig. 6. Digital particle image velocimetry (DPIV) was used to measure variations in
velocity and turbulence levels with the wind tunnel set at an equivalent
airspeed of 5 m s-1 along the x dimension (axis of
airflow). The DPIV system uses a YAG laser and synchronized stereo video
cameras to measure velocities U, V and W, corresponding to
the x, y and z axes, respectively, of particles suspended in
the moving air column. Variation in true airspeed (U) was relative to
a mean of 5.54 m s-1. Total turbulence (T) varied about a
mean of 0.23 %.
