Research on the characteristics of cavity fluid at different angles of the vehicle
A numerical simulation method was established based on the Realizable k-ε turbulence model and the VOF multiphase flow model to study the evolution of the cavitation law and the characteristics of the cavity fluid at different pitch angles of the vehicle.A numerical model of the vehicle entering the water at different pitch angles was established,and the verification of the numerical method was carried out,and the numerical simulation results agreed with the experimental test results.On this basis,the evolution mechanism of the cavitation process of the vehicle into the water and its fluid distribu-tion law and cavitation stage evolution characteristics in the cavity at different pitch angles are studied.The results show that the cavitation process can be divided into surface closure,saturation,deep closure and collapse stages of the cavity accord-ing to the change of fluid distribution in the cavity.In the case of a certain speed of water entry with the vehicle into the wa-ter pitch angle increases the rate of cavity generation decreases,the growth rate of water vapor volume in the cavity de-creases,the peak water vapor volume content becomes smaller,and the volume of air in the saturation phase of the cavity be-comes larger.Cavity surface closure dimensionless time grows logarithmically with the change of pitch angle from-10° to 10°,cavity saturation dimensionless time decreases approximately linearly,and cavity depth closure dimensionlesstime is ba-sically not affected by the change of pitch angle.
vehiclecavitypitch anglesfluid distribution characteristics
万方数据
维普
