Wind tunnel tests on a 1/16th scale laser model. Southampton, UK, University of Southampton, 126pp.
(Ship Science Reports, (55) ).
An analysis of full-scale wind structure relevant to sailing yachts is carried out in order to develop a target model for wind-tunnel simulations. Unavoidable differences between real onset yacht flows and idealised wind-tunnel simulations are pointed out. Detailed measurements of the actual wind-tunnel flows developed for the present tests are discussed in depth, and are compared to idealised cases, concluding that although the simulations are not as good as physically possible, they are perfectly adequate for the present test programme.
Measurements of the forces and moments acting on a 1/16th scale model of a laser yacht for apparent wind directions of 30 and 60 degrees, for heel angles of 0, 10, 20, and 30 degrees, and for smooth and turbulent sheared flow are presented. The results are discussed in terms of sail aerodynamics, and a transformation procedure is developed which leads to an excellent collapse of the measured results on the basis of calculated sail lift and drag coefficients.
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