Analysis of resistance component proportion for a high-speed wheeled amphibious vehicle
Resistance component proportion of a high-speed wheeled amphibious vehicle on water are analyzed in its whole speed range,to provide some well-founded guidance for the design optimization of vehicle style.Numerical simula-tion of the viscous flow field with free surface around the vehicle model is carried out by CFD software FINETM/Marine,and the obtained resistance and posture are verified to be in consistent with model test results,proving good accuracy of the adop-ted CFD method.For the dry transom phenomenon at high speed condition,a double model configuration approach of adding an extender body by cutting the stern trough with dynamic draught plane is presented.Then,the viscous pressure resistance is computed using double model method.With the addition of other resistance components attained in the simulation with free surface,the proportion of each resistance component is determined,and their variation rules with different speeds are studied.The results show that,the water resistance component is more than 90％of the total resistance for all the simulated speed conditions.For the hull borne stage,water viscous pressure resistance is the dominant component,with a proportion varying from 45％to 70％.For the transition sailing stage,wave-making resistance and spraying resistance make up 45％to 70％of the total resistance.For the planning stage,the proportion of water frictional resistance component increases rapidly as speed goes up,achieving as high as 36％at the design speed.
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