Experimental Investigation of Hydrofoil Force Response in Regular Seas at Low Chord Froude Numbers

摘要

The dynamic lift and drag response of a large 8 ft (2.43 m) span, aspect ratio 6 hydrofoil operating in regular waves was experimentally determined for a range of chord Froude numbers varying from 1.22 to 3.66. The amplitude of the fundamental frequency lift response was found to increase significantly with decreasing chord Froude number, while the second harmonic lift response was zero. The amplitude of the first and second harmonic drag response also varied with chord Froud number. The first harmonic drag response was a maximum at the lowest chord Froude number of 1.22, and the shallowest depth chord ratio of 0.5. Several theoretical predictions of the lift amplitude response are compared with the experimental results. (Author)