Simulation of Tail-slap Loads of Supercavitating Projectiles

Zhang, Jiazhong; Zhang, Jinsheng; Wei, Yingjie

doi:10.1109/icic.2010.135

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…The increase of the slenderness ratio of the vehicle is beneficial to reduce the drag coefficient of small highspeed craft, and the drag reduction rate of high-speed craft reaches more than 95%. Zhang et al [22] studied the influencing factors of the impact of the tail shot and concluded that the increase of the mass increases the force of the single tail shot, but as the center of mass moves backward, the number of tail shots will be reduced; that is, the single tail shot will be increased.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Calculation of the Best Center of Mass for Supercavitating Projectile

et al. 2022

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Currently, the supercavitating projectiles mostly rely on experience or experimental results to test the shape of the projectile; however, the cost of the experiment is relatively high, and there is no specific criterion to judge whether the underwater projectile is stable. To solve the aforementioned problems, we study the motion stability and establish motion equations for supercavitating projectiles. Through theoretical analysis and simulation calculations, the optimal center of mass position is designed to optimize the motion performance of underwater supercavitating projectiles. We think this work can provide theoretical support for the optimal design of underwater supercavitating projectiles.

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Section: Introductionmentioning

confidence: 99%

Analysis and Calculation of the Best Center of Mass for Supercavitating Projectile

et al. 2022

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“…Zhao et al [19] established a computational fluid dynamics model under different initial disturbances and studied the ballistic characteristics when tail slaps occur. Zhang et al [20] investigated the tail-slap loads of supercavitating projectiles based on Logvinovich's Principle. They concluded that the impact duration increases while frequency of impacts decreases as the slenderness ratio of projectiles increases.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Tail Slap for an Underwater Projectile within Supercavitation

Zhao

Lyu

2019

Mathematical Problems in Engineering

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Detailed process of the tail slap for an underwater projectile in supercavitation is studied in this paper. Firstly, the horizontal equation of motion for the projectile and a dynamic model of the projectile’s tail slap are introduced through a mathematical derivation, including a simple harmonic motion model of the projectile within the supercavitation layer and the tail slap reflection movement model inside the cavity. Subsequently, the MATLAB software package is used to model the projectile’s motion. Characteristics for force from the projectile tail on the water layer during a single tail slap and the behavior of the projectile’s angular motion as well as the characteristics of projectile tail motion through multiple tail slaps are investigated. It is found that the force magnitude of the water on the projectile tail decreases gradually while the relative motion angle of the projectile tail into the water layer and the contact time increase obviously as the projectile repeatedly slaps the cavity interface. When the projectile velocity decreases into a certain range, i.e., less than 50 m/s, the contact time of the tail in the water layer increases dramatically, and the supercavitation can tend to collapse and lead to unstable projectile motion. With increasing lateral deviation and angular velocity of the projectile tail, the number of tail slaps and the angle of reflection both increase significantly. In the case of supercavitation, the parameters of different tail slap points tend to be stable with time.

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“…In this case, the great difference between the liquid and vapor viscosity is responsible for the drag reduction. Actually, the body is contact with the vapor instead of water and the physical behavior is called supercavitation (Zhang et al 2010, Obikane et al 2011, Shang 2013.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Steady Supercavitating Flows

Jafarian

Pishevar

2016

JAFM

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In this research, the Supercavitation phenomenon in compressible liquid flows is simulated. The one-fluid method based on a new exact two-phase Riemann solver is used for modeling. The cavitation is considered as an isothermal process and a consistent equation of state with the physical behavior of the water is used. High speed flow of water over a cylinder and a projectile are simulated and the results are compared with the previous numerical and experimental results. The cavitation bubble profile in both cases agrees well with the previous experimental results reported in the literature. As the result shows, coupling the two-phase Riemann solver with the considered EOS prepares a robust method for simulating the compressible fluid flow with cavitation which can undertake the whole physical behavior of water in a supercavitation process. Furthermore, the influence of the cavitator head and the flow speed on the supercavitation bubble is explored. The results show that cavitators with sharper head results in a smaller supercavitating bubble. Increasing the flow speed beyond a specific limit does not have any significant effect on the cavitation bubble and slightly increases the bubble size.

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Simulation of Tail-slap Loads of Supercavitating Projectiles

Cited by 4 publications

References 4 publications

Analysis and Calculation of the Best Center of Mass for Supercavitating Projectile

Analysis and Calculation of the Best Center of Mass for Supercavitating Projectile

Modeling of the Tail Slap for an Underwater Projectile within Supercavitation

Numerical Simulation of Steady Supercavitating Flows

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