Author(s): T. Staubli; M. Hegland

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Abstract: Current meters are mounted on a much shorter suspension during the calibration than during field measurements and a three-dimensional flow around the end of the suspension occurs. This flow is analysed by potential flow theory. The situation in the channel corresponds to a boundary value problem. This problem is solved by using double Fourier series to describe source density and potential. The velocity induced by the mounting rod is calculated in the region of the rotor of the current meter. The influence of the distance between the current meter and the end of the mounting rod is investigated for one channel geometry. The computed results are verified by measurements in a towing tank. Recommendations are given concerning a correction of the calibration results in small rating tanks and concerning a minimum distance of the current meter from the end of the rod.

DOI: https://doi.org/10.1080/00221688209499473

Year: 1982