Abstract
To explore the effects of water entry angle on the cavitation flow field of high-speed revolution body, based on the finite volume method, VOF (Volume of Fluid) multiphase model, Schnerr-Sauer cavity model, SST k-ω turbulence model, and dynamic mesh method, numerical simulation for modeling the oblique water entry of revolution body at high speed is performed. The evolution laws of cavity shape, motion characteristics, and hydrodynamic characteristics of revolution body at different water entry angles are analyzed. The results show that the numerical calculation method can effectively simulate the change of cavity shape during the water entry of the revolution body. With the increase of water entry angle, the uplift of liquid level decreases in the positive direction of the open cavity and increases in the negative direction. The angle of water entry has little effect on the velocity of the revolution body. The larger the angle of water entry, the greater the peak pressure and the faster the pressure decay at the moment of water entry.
Highlights
When the hydrodynamic forces act on the surface of the vehicle entering water at high speed, a low pressure region is formed locally
The results show that the numerical calculation method can effectively simulate the change of cavity shape during the water entry of the revolution body
The cavity shape, motion and hydrodynamic characteristics of the revolution body at different angles and different velocities are calculated by numerical calculation
Summary
When the hydrodynamic forces act on the surface of the vehicle entering water at high speed, a low pressure region is formed locally. In recent years, with the development of underwater weapons and the application of water surface recovery of spacecraft and rocket engines, it is more urgent and important to master the influence of water entry angle on the flow field characteristics of the vehicle in the process of water entry. Song et al [8] studied the development law of cavity shapes, motion characteristics, and hydrodynamic characteristics of water entry of revolution bodies with different head, shaped by experiment and numerical simulation. Shi and Hu et al [9, 10] carried out experiments and numerical simulations on supercavitation flow characteristics of bluff bodies with different head shapes entering water at different velocities. According to the existing literatures, the numerical simulation of cavitation and flow field characteristics is mainly simplified as a singledegree-of-freedom vertical water entry. The research results can provide theoretical reference for engineering practice
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