Study On Fluid Dynamic Performance Of Unmanned Sailboat For Marine Monitoring

As people pay more and more attention to the development of marine resources and marine environment monitoring,unmanned sailboat has received widespread attention.However,the research on the hull performance of modern sailboat,especially in the field of small sailboat,is rare.The empirical formula is not applicable to modern sailboat.Computational Fluid Dynamics lacks verification.Experimental data are rarely published.The systematic test study of the fluid dynamic performance of the unmanned sailboat is beneficial to the optimization of the small sailboat.And it improves the performance of the small unmanned sailboat,making it more reliable in complex marine environments.Aiming at marine monitoring,this paper designed a small unmanned sailboat which can face complex marine environment and studied the fluid dynamic performance of this sailboat.In this paper,the captive model tests were employed for this sailboat.A rudder test was performed on the tilted twin rudder.At the same time,an aerodynamic model of rigid wing sail was established by wind tunnel tests.The comparison between the simulation and the sailing data verified the accuracy of the maneuverability model obtained by these tests.According to the test results,this paper improved the old velocity prediction program from restrained heading to course,established the velocity prediction program of the sailboat,and calculated the velocity polar diagram of this sailboat.Based on the velocity prediction program,the effect of sail position on the performance of unmanned sailboat was explored.The research is significant for further design and application of small unmanned sailboat.This research is the premise of improving the performance of unmanned sailboat for marine monitoring in complex sea conditions and planning a reasonable sailing route.And it is also the basis for studying the effect mechanism of waves on small sailboat.