Calibration of a wedge-shaped vee hot-film probe in a towing tank

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Abstract
A wedge-shaped vee hot-film probe was calibrated in a towing tank. The calibration velocity varied from 0.05 to 2.05 ms-1. The calibration range of the yaw angle was over a 90 degrees quadrant. The quality and temperature of the water in the towing tank were uncontrolled. The techniques and procedure involved in the calibration are described together with the calibration results. The calibration revealed a number of features different from the calibration of hot-wire probes. In particular, sensor deterioration and voltage drift were encountered in the early stages of the experiment. The probe became stable after several days of operation and the calibration results were then found to be repeatable. The probe normal calibration curves were fitted by a modified King's law. A two-variable nonlinear polynomial was applied to the calibration data; this led to much improved fitting accuracy.