On the Construction of a Trans-media Water-entry Test System for Projectile

doi:10.12382/bgxb.2024.0950

Abstract

Abstract:

To comprehensively carry out the trans-media water entry test of projectile under the mutual coupling of different motion peculiarities and various operating environment properties,a multifunctional trans-media water-entry test system is built.The test system includes a launch subsystem,a parameter measurement subsystem,and a medium property subsystem.The launch subsystem is mainly used for the trans-media water entry test of projectile under the mutual coupling of multiple factors,and is checked via numerical simulation.The results indicate that the launch subsystem is safe and reliablem,and could be used to perform tests normally.The parameter measurement subsystem is used to qualitatively observe the temporal and spatial evolution of cavitation bubbles during the trans-media water entry process of projectile via a high-speed camera and quantitatively measure the real-time change of acceleration by a acceleration sensor.The medium property subsystem is used to build an operating environment with different viscosities and densities.Overall variations of bubbles and accelerations obtained from tests indicate that the test system could be fully employed to perform trans-media water entry test for the projectile.

Key words: projectile, trans-media water entry, launch subsystem, parameter measurement subsystem, medium property subsystem

HAN Xiangdong, WANG Xiquan, LI Chao, CHEN Junbiao, LI Junzhi, FENG Huiyong, WEI Xuemei. On the Construction of a Trans-media Water-entry Test System for Projectile[J]. Acta Armamentarii, 2024, 45(S2): 199-207.

Figures/Tables 31

Fig.1 Launch subsystem

Fig.2 Trans-mediawater-entry impact components

Table 1 Parameters ofair compressor

参数	数值	参数	数值
产品型号	BW320P	额定电压/V	380
容积流量/(L·min^-1)	320	电机转速/(r·min^-1)	1300
电机功率/kW	7.5	排气压力/MPa	30

Fig.3 Schematic diagram of angle adjustment for launch tube

Fig.4 Contour of the displacement variation of mobile stand at12.48°

Fig.5 Contour of the stress variation of mobile stand at 12.48°

Fig.6 Contour of the displacement variation of mobile stand at 45°

Fig.7 Contour of the stress variation of mobile stand at 45°

Fig.8 Contour of pressure distribution on the surface of water tank

Fig.9 Contour of the displacement ofwater tank

Fig.10 Contour of the stress ofwater tank

Fig.11 Stress concentration point of water tank

Fig.12 Contour of the window displacement

Fig.13 Contour of window stress

Fig.14 Physical picture of temperature control device

Fig.15 Parameter measurement subsystem

Fig.16 Arrangement of observation instruments

Fig.17 High-speed camera

Fig.18 Acceleration sensor

Fig.19 Variation ofacceleration sensor sensitivity

Fig.20 DH5916-10 dynamic signal acquisition instrument

Fig.21 Interface figure of DHDAS dynamic signal analysis system

Fig.22 Viscosity testing apparatus

Fig.23 Density testing meter

Fig.24 Digital thermometer

Fig.25 Variation oflithium bromide solution viscosity

Fig.26 Variation oflithium bromide solution density

Fig.27 Testprojectile

Fig.28 Variation of cavitation bubbles in thetrans-media water entry process of projectile

Fig.29 Variation of acceleration inthe trans-media water entry process of projectile

Fig.30 Partial enlarged image of acceleration variation

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