Abstract
An interceptor is an appendage widely used for high-speed planing boats to reduce resistance and modify hull attitude by the lift force-induced, but the relationship between the induced lift force and the factors affecting it are still not clear, especially for the vessels other than the planing hull. In this paper, a model test of a series of models is performed to investigate the lift force induced by an interceptor and the influence of the affecting factors systematically. The lift forces induced by the interceptor are tested in the conditions of different velocities, interceptor heights, angles, and drafts in the towing tank. The effects of each factor and the coupled effects are analyzed. It is found by the experimental results that the lift coefficient of the induce lift force in the present investigation is approximately proportional to the square of the non-dimensional velocity and interceptor height, but the effect of the interceptor height is of a limited extent. The influence of angle and draft on the lift force induced by the interceptor cannot be ignored in the present study. The induced lift force is decreased when the angle of the plate is reduced and is enhanced when the draft is increased.
Highlights
Experimental Study with CaptiveA small structure that is perpendicular to the flow direction is considered a powerful appendage modifying the flow field, such as the wing flap of the plane and the interceptor of the ship
Results and Analysis on the Effect of Factors. It is indicated by the investigation performed by Mansoori et al that the lift force induced by the interceptor is the primary reason for resistance reduction, so a series of model tests are used to investigate the variation of lift force in different conditions, ignoring the resistance
Because the experimental conditions are limited and the details of the flow field, such as the pressure distribution on the plate and vortex shedding cannot be obtained in the test, more details can be found in the previous investigations based on CFD [28]
Summary
A small structure that is perpendicular to the flow direction is considered a powerful appendage modifying the flow field, such as the wing flap of the plane and the interceptor of the ship. The investigation performed by Mansoori et al [26] is constructive because a general rule of the effect caused by the interceptor was obtained by adopting a 2-D flat plate rather than a specific hull form Both numerical simulation and model tests were conducted to study the flow field around the plate with the interceptor, the flow field details were given to estimate the lift force induced by the interceptor. A problem is caused by this approach, namely, the flow field is changed with draft and influenced by the wave generated on the free surface It is shown in the literature survey that the lift force induced by the interceptor is known as the reason for resistance reduction and hull attitude optimization for planing boats.
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