Calculation of Effective Wake Distribution of a Simple Hull Form

概要

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A method for calculating effective wake distribution is developed for a three-dimensional hull form. In the present study the momentum integral equations of the boundary layer and wake are solved by an iterative procedure taking the interaction between propeller and ship wake into account. The velocity field with an operating propeller is divided into effective velocity field and propeller induced velocity field, and the boundary layer approximation is assumed to be applicable to the effective velocity field while the propeller induced velocity field is assumed to be inviscid. To examine the validity of the method the flow measurements were made for a simple hull form, i. e. Wigley's parabolic hull form model, It was found that the method can predict fairly well the velocity field with and without a propeller. The calculated results show that the degree of change from the nominal wake distribution into the effective wake distribution is large in the region where the propeller induced velocity is strong and the velocity gradient of the nominal velocity field is steep.