Load-Reducing Characteristics of Gas Screen During Underwater Launch of the Vehicle

doi:10.16183/j.cnki.jsjtu.2022.323

Abstract

Abstract:

During the underwater launching process, a gas screen channel is formed near the opening of the cylinder, which can effectively reduce the high-frequency pulsation load on the surface of the vehicle exiting the cylinder. Based on the volume of fluid (VOF) homogeneous multiphase flow theory, the standard RNG k-ε turbulence model, and the overlaid grid technology, this paper studies the influence law of the gas screen on the surface of the vehicle to improve the pulsating load of the vehicle, and analyses the flow field structure and hydrodynamic evolution under the gas screen environment. The characteristics of the gas curtain flow field structure evolution and the discharge load reduction effect at different cross-flow intensities and gas mass flow rates were compared. The results show that the high-speed gas ejected from the nozzles approximately covers the surface of the vehicle during the exiting process, and gradually forms a gas channel around the opening of the launch vessel, thereby reducing the surface load of the vehicle significantly. Under the condition of gas screen, both the moment and the surface load on the body have been significantly reduced, with the peak value of the moment reduced by 80.3%, and the peak pressure on the surface of the vehicle reduced by 81.2%. However, the peak pressure on the surface of the vehicle increases by a maximum of 56.7% upon increasing cross-flow intensity. Finally, the mass flow rate increases from 2 kg/s to 16 kg/s, with the moment on the vehicle reduced by 80.8% and the peak surface pressure reduced by 82.8%.

Key words: vehicle, multiphase flow, pulsating load, gas screen load reduction, hydrodynamic characteristics

CLC Number:

U661
TJ762.4

SHI Yao, LU Jiewen, DU Xiaoxu, GAO Shan, REN Jinyi. Load-Reducing Characteristics of Gas Screen During Underwater Launch of the Vehicle[J]. Journal of Shanghai Jiao Tong University, 2024, 58(2): 211-219.

Figures/Tables 16

Fig.1

Fig.2

Fig.3

Fig.4

Tab.1

Parameters of vehicle

参数	数值
航行体长度,l/m	1.617
航行体直径,d/m	0.294
出筒速度,v_e/(m·s^-1)	—
水深,H/m	4
艇速,u_∞/(m·s^-1)	0,1,2
无量纲艇速,ΔS=Δs/d	—
雷诺数,Re= $ρ w v e l μ w$	5.97×10⁵
欧拉数,Eu= $p ∞ ρ v e 2$	0.84
弗劳德数,Fr= $v e g l$	2.74
无量纲横流速度,U=v_e/v	—
压力系数,C_p= $p - p ∞ 12 ρ v e 2$	—
航行体无量纲水平方向位移,Z	—
无量纲竖直方向位移,X	—

Tab.1

Fig.5

Fig.6

Tab.2

Grid convergence analysis

网格节点数×10^-4	r	f( $p -$ )	ε	GCI/%
103	1.304	0.465	0.056 35	16.47
233	1.245	0.479	0.025 98	8.96
512	1.234	0.494	0.006 12	2.24
978	1.145	0.499	0.003 96	1.98
1 127	—	0.503	—	—

Tab.2

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

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