Abstract
In this study, an attempt has been made to investigate the supercavitation and hydrodynamic characteristics of high-speed vehicles. A homogeneous equilibrium flow model and a Schnerr–Sauer model based on the Reynolds-averaged Navier–Stokes method are used. Grid-independent inspection and comparison with experimental data in the literature have been carried out to verify the accuracy of numerical methods. The effect of the navigation speed and angle of attack on the cavitation morphology and dynamic characteristics has been investigated. It has been demonstrated that the angle of attack has a remarkable influence on the wet surface and hydrodynamic force, whereas navigation speed has little effect on the position force of the vehicle under the circumstance of no wet surface. The hydrodynamic force changes periodically with the swing of the vehicle, but its maximum is greater than that for the direct navigation state at the same attack angle. Moreover, the damping effect obviously affects the hydrodynamic force amplitude and movement trend.
Highlights
The results showed that in the supercavitation shape, the drag coefficient of the vehicle at the head of the disk cavithe supercavitation the drag to coefficient at the head of the disk tator was inverselyshape, proportional the area of ofthe thevehicle cavitator, and increasing thecavitator slenderwas inversely proportional to the area of the cavitator, and increasing the slenderness ratio ness ratio of the vehicle was conducive to the drag reduction effect of the supercavitation
When moving back from the maximum attack angle, the position force is partly offset by the damping force, delaying the variation of the force
When there is no wet surface on the surface of an ultrahigh-speed vehicle, its position force characteristics are less affected by the navigation speed
Summary
Academic Editors: Alon Gany, Peng Du, Haibao Hu, Xiaopeng Chen and Abdellatif Ouahsine. There is important theoretical and practical significance in studying changes in the supercavitation shape and the damping force characteristics of underwater vehicles. Numerous investigations on supercavitation underwater vehicles have been conducted. 900 m/s explored thedrag relacoefficient of a supercavitating vehicle at speeds of m/s to m/s and explored the tionship between the drag coefficient and cavitator diameter. Li [17] investigated the cavitation morphology and tail ogy and tail beat effect of underwater vehicles at high speed (1000 m/s). The numerical beat effect of underwater vehicles at high speed (1000 m/s). The effects of the attack angle, navigation speed, and swing motion supercavitation vehicle. The effects of the attack angle, navigation speed, and swing on the on cavitation shape shape and hydrodynamic force are analyzed.
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