Effect of bow spray strips and Ω-type freeboard on high-speed boats

Abstract：A high-speed boat may encounter severe wave-making at the bow and become wetter at high speed. Some measures can be taken to overcome these disadvantages. In order to compare the effect of bow spray strips and Ω-type freeboards on a high-speed boat, hull wetness, resistance, hull motion, stability and the restoring moment of the heel at high speed of models with these two kinds of auxiliaries were calculated and measured. CFD methods and model tests were adopted. Both of these two auxiliaries can reduce hull wetness, and the model with a Ω-type freeboard has a better initial stability and larger restoring moment of the heel at high speed. A free running model test also indicates that the Ω-type freeboard has a fine performance. words：high-speed boat；Ω-type freeboard；hull wetness；stability；restoring moment of heel； Key numerical tank test

WEI Chengzhu1，2，LI Yinghui1，YI Hong2 1 State Key Laboratory of Ocean Engineering，Shanghai Jiao Tong University，Shanghai 200240，China 2 Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration，Shanghai 200240，China