高次船型の流場解析

概要

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Measurements of the three-dimensional flow velocity components (u, v, w) are carried out around a 2 m Inuid Model M 21 where a specially developed mini five-hole pitot tube of 6 mm diameter is applied satisfactorily. The velocity components are analyzed (u, v, w-analysis) in a synthetic co-ordination with the corresponding wave analysis (ζ-analysis) which was previously reported on the same model (M21). The study indicates that, i.e. For potential field ; (1) The two linearlized free surface conditions, i.e. the "atmospheric" condition as well as the "kinematical" condition, are both valid either between ζ (measured) and u (measured) or between. ∂ζ/∂x (measured) and w (measured). (2) The behaviour of the transverse component v(y) is the most important, because this component alone can give the unique informations for sheltering effects which are not included in the wave-analysis. (3) The results analyzed from u or w are almost similar to those already obtained by wave analysis. For viscous field ; (4) The flow field analysis is useful also for the refinement of the wake-survey by enabling the quantitative estimation of the disturbance velocity (u_1) which is fictitiously presumed within the wake belt.
社団法人日本船舶海洋工学会の論文