Numerical Investigation of Tail Shape Effects on the Tail-slap of Supercavitating Projectiles

doi:10.12382/bgxb.2022.0689

Abstract

Abstract:

Tail-slap motion is vital for maintaining stable navigation of supercavitating projectiles. To study the influence of the tail shape on the motion characteristics of a supercavitating projectile during tail-slap navigation, a three-dimensional free tail-slap motion simulation model is constructed using the finite volume method and Mixture multiphase flow model, as well as dynamic mesh technology. The tail-slap motion characteristics of the four projectiles with different tail shapes(i.e., cylindrical tail projectile, cone tail projectile, fin-stabilized projectile and flare-stabilized projectile) are compared, and the intrinsic motion state characteristics of the projectiles are analyzed with different initial angular velocities. The results show that the tail shape affects the wetting area and the shape of the cavitation it produces. Larger wet surface areas or larger angles between wet surface and projectile velocity direction lead to increased torque and tail beat frequency, along with slower velocity attenuation.Steady navigation velocity attenuation ranking is fin-stabilized > cone tail > cylindrical tail > flare-stabilized projectile. All the four projectiles exhibit an“inherent tail motion state” related to their geometry, independent of initial disturbance angular velocity. In this state, the peak value of angular velocity oscillation decreases with the velocity proportionally.

Key words: supercavitating projectile, tail-slap, numerical simulation, tail shape, multiphase flow

CLC Number:

O351

LIU Rushi, GUO Zeqing, ZHANG Hui. Numerical Investigation of Tail Shape Effects on the Tail-slap of Supercavitating Projectiles[J]. Acta Armamentarii, 2023, 44(10): 2984-2994.

Figures/Tables 20

Fig.1 Comparison of simulated cavity and experimental cavity

Fig.2 Comparison of simulated data and experimental data

Fig.3 Projectile models

Table 1 Main projectile parameters

名称	数值
射弹质量/kg	0.13
转动惯量/(kg·m²)	3.29×10^-4
质心位置(距弹头)/m	0.0787
空化器直径/m	0.004
前锥段长/m	0.0654
弹长/m	0.2
射弹直径/m	0.012

Fig.4 Computational domain and boundary conditions

Fig.5 Meshing of computational domain

Fig.6 Grid independence verification

Fig.7 Comparison of cavitation shape and surface pressure in three tail-slap stages

Fig.8 Force analysis under the three stages of tail-slap

Fig.9 Torque variation with angle of attack

Fig.10 Comparison of torque coefficients

Fig.11 Comparison of drag coefficients

Fig.12 Comparison of lift coefficient

Fig.13 Comparison of angle of attack

Fig.14 Variation of the radius of cavitation at the tail of projectile with velocity calculated by empirical formula and numerical simulation

Fig.15 Comparison of angular velocities

Fig.16 Comparison of tail-slap frequencies

Fig.17 Velocity attenuation curves

Fig.18 Variation of angular velocity with velocity under different initial angular velocities

Fig.19 Upper envelope of angular velocity oscillation after the tail is stabilized

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