Study of the Lift Force Induced by An Interceptor on A High-Speed Mono-Hull: The Affecting Factors and Estimation Formula

To find a better way to estimate the lift force induced by an interceptor on a high-speed mono-hull ship, a series of high-speed mono-hull ship models are designed and investigated under different conditions. Different lift forces are obtained by numerical calculations and validated by a model test in a towing tank. The factors that influence the force are the interceptor height, velocity, draft, and deadrise angle. The relationship between each factor and the induced lift force is investigated and obtained. We found that the induced lift mainly depends on the interceptor height and advancing velocity, and is proportional to the square of the interceptor height and velocity. The results also showed that the effects of the draft and deadrise angle are relatively less important, and the relationship between the induced lift and these two factors is generally linear. Based on the results, a formula including the combined effect of all factors used to estimate the lift force induced by the interceptor is developed based on systematic analysis. The proposed formula could be used to estimate the lift force induced by interceptors, especially under high-speed condition.