Study On The Resistance And Motion Performance Of Double-chine Hydroplane

The development of the planing hulls has a long history,especially the conventional mono-hull craft,this type of boat is vulnerable to relatively large stalls and sever slammings in the wind and waves,so the navigation is limited,and the planning hull is more applicable in the military field,extensively.And therefore the development of the military field is also limited.At the same time,the resistance value increases rapidly at high speed and the sea keeping performance is poor.To solve this problem,you can change the boat type.In this paper,the C series single hull craft model tested by Taunton's model test is used as the parent model.The model is based on the statistics of the world's mainstream high-speed boat type parameters.With reference to the parent ship type,on the basis of a series of single hull craft models,two pairs of chines are formed in the bilge and a new boat type is established,namely a double-chine planing boat.The matching between the second chine and the first chine formed on the basis of the original mother ship model is in the width direction,the planning surface deadrise angle between the two chines and the height of the bar height between chines.The focus of this article is that they have a certain influence on the resistance and wave resistance of the new boat during different gliding stages.Therefore,how to obtain optimal hydrodynamic performance requires preliminary research on this new type of boat.In this thesis,the commercial CFD software STAR-CCM+ based on the finite volume method(FVM)was used to study and analyze the hydrodynamic characteristics.Firstly,in the established numerical boat pool,dynamic mesh technology is used to propose a calculation plan for a mid-high-speed mono-hull craft.The validity of the CFD calculation scheme adopted in this paper is verified by comparing the experimental data obtained by the ship model in calm water with the calculated values of the numerical simulation.Secondly,the double-chine planing boat type was introduced and its hydrodynamic characteristics in calm water were analyzed using CFD technology.By comparison with the drag,hull navigation attitude,hull wave,boat bottom pressure distribution,etc.of the planing boat with a wide range of ordinary monomer series,the hydrodynamic similarities and differences in the hydrostatic navigation are analyzed,which shows that the double-chine planning boat have an advantage in resistance.Afterwards,by analyzing the distribution and pressure conditions of the water and gas in the bilge,the hydrodynamic mechanism of the bilge was elucidated.Through the incremental study on the width matching of the double-chine planing boat and the angle of the deadrise angle of the transitional plane between the two chines and the height of the spray strip,the appropriate parameters of the craft were explored.Finally,the establishment of a three-dimensional wave tank in STAR-CCM+ is based on wave making technology and wave elimination technology.The three-dimensional wave tank is used to study the hydrodynamic characteristics of double-chine planning boats under regular waves in the condition of head sea.