Modeling of Interior Trajectory of Water-driven Underwater Launch Device with Two-stage Piston

doi:10.12382/bgxb.2022.0670

Abstract

Abstract:

In order to meet the requirements of underwater launch technology in large deep environment, a new water-driven underwater launch device with two-stage piston is proposed. The launch device is driven by high-pressure water in large deep environment to launch projectiles rapidly. A dynamic model of projectile pulled out of launching tube is established, and the principle verification test using high-pressure water-driven scheme is carried out. And the test data are compared with those of the reference test using high-pressure gas-driven scheme. The results show that the interior trajectories of water- and gas-driven schemes are basically the same. The comparative advantage of the high-pressure water-driven scheme is very obvious in large depth environment. The peak acceleration appears mainly in two moving processes, namely the launching instant and interstage transition between two stage pistons. The acceleration of projectile motion changes sharply in the interstage transition. The trajectory predicted results show that the maximum velocity range is 7.4-15.3m/s and the maximum acceleration is less than 100m/s²under the condition of the underwater launching depth of 100-500m. The results verify the feasibility of the underwater launch device of two-stage piston driven by water pressure, which provides the design basis for the further development of launch device.

Key words: underwater launch in large deep water, water drive, two-stage piston cylinder, modeling of interior trajectory

CLC Number:

TJ63⁺5

DING Yanchao, WANG Baoshou, WU Wenting, LIU Xinhui, TONG Xin. Modeling of Interior Trajectory of Water-driven Underwater Launch Device with Two-stage Piston[J]. Acta Armamentarii, 2024, 45(2): 594-605.

Figures/Tables 29

Fig.1 Schematic diagram of launch devicestructure

Fig.2 Schematic diagram of piston buffering

Fig.3 Schematic diagram of working principle of launch device

Fig.4 Schematic diagram of projectile moving in one-point constrained state

Fig.5 Schematic diagram of projectile moving in two-points constrained state

Fig.6 Flow chartof simulation iteration

Fig.7 Schematic diagram of ground principle experiment

Fig.8 Photo of launch device for ground principle test

Table 1 Parameter list of launch device

参数名称	原理试验数值	水下发射仿真数值
A₁/cm²	28.9	58.9
A₂/cm²	19.6	19.6,39.2,58.8
A₃/cm²	25.0	37.7
S₁/cm²	113.0	113.0
S₂/cm²	70.9	70.9
S₃/cm²	54.0	54.0
S₄/cm²	12.6	12.6

Table 2 Initial value list of input variable

参数名称	原理试验数值	水下发射仿真数值
p_a/MPa	1.8	1.1,3.1,5.1
p₁/MPa	0.1	1.1,3.1,5.1
p₂/MPa	0.1	1.1,3.1,5.1
p₃/MPa	0.1	1.1,3.1,5.1
p₄/MPa	0.1	0.1
Δ₁/cm³	20	20
Δ₂/cm³	18	18
Δ₃/cm³	11000	11000
Δ₄/cm³	50000	50000
t₁/s	0	0
t₂/s	0.15	0.15
t₃/s	0.35	0.30

Fig.9 Acceleration ax curves of projectile in tests with different working principles

Fig.10 Velocity vx curves of projectile in tests with different working principles

Fig.11 Pressure curve of piston cylinder

Fig.12 Acceleration ax curves of projectile

Fig.13 Velocity vx curves of projectile

Fig.14 Pitch angle curve of projectile

Fig.15 Displacement y curves of projectile

Fig.16 Pressure curves of piston cylinder

Fig.17 Speed of waterlow between piston cylinders

Fig.18 Acceleration ax curves of different water inlet holes

Fig.19 Velocity vx curves of different water inlet holes

Fig.20 Pressure p3 curve of the first stage piston

Fig.21 Velocity u1 curve of the first stage piston

Fig.22 Flow velocity curves of different damping holes

Fig.23 Acceleration ax curves of different damping holes

Fig.24 Acceleration ax vs. ambient pressure

Fig.25 Velocity vx vs. ambient pressure

Fig.26 Pitch angle θ vs. ambient pressure

Fig.27 Tail displacement ya vs. ambient pressure

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