X-WIRE RESPONSE IN TURBULENT FLOWS OF HIGH INTENSITY TURBULENCE AND LOW MEAN VELOCITIES.

The angular response of a x-wire is studied at low velocities (. 25 m/s to 1 m/s). It is found that the k-factor in the Champagne Law is strongly velocity dependent. The implications of this on multi-component measurement are explored, and a practical scheme for incorporating it is proposed. At lower velocities a total loss of directional sensitivity is observed which leads to additional errors in x-wire measurements. Also, a 'dropout' phenomenon is observed in which certain voltage pairs can not be converted into the velocity components. The implication of this dropout and rectification on the turbulence measurements is also discussed.