Numerical Study on the Influence of Cone Geometry of Supercavitating Vehicle on Its Tail-slap Motion

doi:10.12382/bgxb.2022.0744

Abstract

Abstract:

The shape design of the supercavitating vehicle is related to its tail-slap motion characteristics. In order to obtain the influence of the cone part of supercavitating vehicle on its tail-slap motion, the dynamic grid technology combined with the VOF multiphase flow model,SST k-ω turbulence model and Schnerr-Sauer cavitation model are applied to simulate the tail-slap motion of supercavitating vehicle with the four different cone parts. The tail-slap motion and trajectory characteristics of supercavitating vehicle are analyzed. The results show that the influence of the cone geometry on the tail-slap stability of supercavitating vehicle is nonlinear under the condition of a certain pitch angle speed. If the cone section is too long or too short, the shoulder of supercavitating vehicle will get wet and form secondary cavitation. The development of secondary cavitation can inhibit the tail wet, which causes the turning moment failing to reduce the pitching angle and then the tail-slap motion and the trajectory showing instability.

Key words: supercavitating vehicle, cone geometry, tail-slap, 6 degrees of freedom

CLC Number:

O352

ZHANG Liang, HU Changli, WU Xiao’an. Numerical Study on the Influence of Cone Geometry of Supercavitating Vehicle on Its Tail-slap Motion[J]. Acta Armamentarii, 2024, 45(3): 828-836.

Figures/Tables 18

Fig.1 Vehicle model

Fig.2 Grid division

Table 1 Main parameters of the vehicle

工况	锥段长度 L_C/mm	L_C/L_B	转动惯量 I_z/(kg·m²)	质心位置 (距离头部) x/mm
1	17	0.1	1.0075×10^-4	89.47
2	51	0.3	9.9952×10^-4	97.80
3	85	0.5	9.6972×10^-4	104.90
4	119	0.7	9.0353×10^-4	110.50

Fig.3 Model boundary conditions and domain size

Fig.4 Comparison of cavitation contours under different numbers of grids

Fig.5 Comparison of drag coefficients under different numbers of grids

Fig.6 Projectile geometric model

Fig.7 Numerical results were compared with experimental values[21]

Fig.8 Motion characteristics of tail-slap of vehicle for LC/LB=0.3

Fig.9 The shape of the cavitation in the tail-slap of the vehicle with different cone geometry

Fig.10 Variation of pitch angle of vehicle with different cone geometries

Fig.11 Variation of pitch moment of vehicle with different cone geometries

Fig.12 Tail-slap process of a vehicle with cone geometry LC/LB=0.7

Fig.13 Tail-slap process of vehicle for LC/LB=0.1

Fig.14 Cavitation profile of vehicle with cone geometry LC/LB=0.1

Fig.15 Hydrodynamic characteristics of vehicle with different cone geometries

Fig.16 Speed and displacement variation characteristics of vehicle with different cone geometries

Table 2 First tail-slap time and wet condition of vehicles in different cone sections

尾拍时间及沾湿情况	L_C/L_B
尾拍时间及沾湿情况	0.1	0.3	0.5	0.7
首次尾拍时间t/ms	0.8	1.9	1.9	1.9
头部沾湿范围/(°)	0~1.3	0~3.12	0~3.14	0~3.23
肩部沾湿范围/(°)	>1.3			>3.6
尾部沾湿范围/(°)	>7.5	>3.12	>3.14	>3.23

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