Experiments and Simulation of Continuous Water Entry and Exit Trajectories of a Trans-media Vehicle

doi:10.12382/bgxb.2022.0362

Abstract

Abstract:

To study the characteristics of continuous water entry and exit trajectories of a trans-media vehicle, a high-speed ballistic test platform is built, and the experimental model with a built-in measuring system is designed. An unsteady numerical simulation model is developed to solve the coupled flow field and vehicle motions. The motion law and hydrodynamic characteristics of the vehicle’s continuous water entry and exit trajectories are studied and validated by experimental results. The results show that the proposed trans-media vehicle realizes a continuous ballistic process of water entry, leveling and water exit. The trajectory is parabola-like, with a maximum entry depth of 0.9m. The continuous ballistic movement of the trans-media vehicle can be divided into three stages: the planing stage of water entry, the supercavitating stage with a double-sided tail-slapping motion, and the water exit stage with a single-sided tail-slapping motion. The vehicle exhibits pulse oscillation in terms of hydrodynamics, and hydrodynamic characteristics in its aft body are formed by the cone, cylinder and tail-skirt sections. The combination of a preset rudder angle and tail-skirt can enhance the stability of the trans-media vehicle during continuous water entry and exit.

Key words: trans-media vehicle, high-speed water-entry, flat trajectory, coupling of flow field and trajectory, tail-slapping motion

LIU Xiyan, YUAN Xulong, LUO Kai, LU Na. Experiments and Simulation of Continuous Water Entry and Exit Trajectories of a Trans-media Vehicle[J]. Acta Armamentarii, 2023, 44(5): 1225-1236.

Figures/Tables 23

Fig.1 Schematic diagram of the experimental setup

Fig.2 Experimental model of the trans-media vehicle

Fig.3 Experimental site

Fig.4 Schematic diagram of the coordinate system

Fig.5 Contours of the trans-media vehicle

Table 1 Main parameters of the trans-media vehicle

参数	数值
预置舵角/(°)	5
空化器半径/mm	15
圆柱段半径/mm	35
尾裙长度/mm	69
模型长度/mm	1000

Fig.6 Computational domain and boundary conditions

Fig.7 Meshing results

Fig.8 Influence of grid number

Fig.9 Influence of time steps

Fig.10 Initial stage of water-entry

Fig.11 Stage of supercavitation navigation

Fig.12 Stage of water-exit

Fig.13 Comparison of experimental and numerical results

Fig.14 Pressure contours of the trans-media vehicle during water entry and exit

Table 2 Characteristics of cavitation development

Fig.15 Cavitation characteristics of different immersion depths in planing stage

Fig.16 Distribution of shell pressure coefficients

Fig.17 Pitching angular velocity and angle vs time

Fig.18 Variation curve of the vehicle’s hydrodynamic coefficients

Fig.19 Flowline diagram of the re-entrant jet

Fig.20 Sectional position and force diagram of the vehicle

Table 3 Relative position of tail-skirt and cavitation

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