Interior Trajectory Characteristics of Underwater Ejection Using a Flexible Piston Rod Driven by Water Pressure

doi:10.12382/bgxb.2024.0087

Abstract

Abstract:

In order to meet the requirements of unmanned underwater vehicle (UUV) launching the torpedos,a new underwater ejection scheme with flexible piston rod is proposed.In the ejection scheme,the high pressure in large depth environment is used to drive the piston to launch a torpedo.An interior trajectory calculation model of torpedo launched from the ejection device with flexible piston rod is established.And the model is verified by the principle test in the high pressure water tank laboratory.The different launching schemes in the related literatures are comparatively studied based on the model.The results show that the ejection scheme with flexible piston rod has the characteristics of smooth acceleration without steep change,large effective acceleration stroke and high pipe exit speed compared with the traditional multistage cylinder launching scheme.Compared with the traditional high-pressure gas-driven piston scheme,the high-pressure water-driven piston scheme is simpler in structure without pressure storage device.A piston buffer scheme based on load reduction in steps proposed in the paper has better load reduction effect compared with the traditional throttle hole buffer scheme.And it won’t cause excessive pressure in the reverse cavity of piston cylinder.Under the ambient pressure of 1.1-6.1MPa,the predicted velocity of torpedo exiting tube varies from 7.0 to 11.6m/s,and the rear reference point of torpedo dose not collide with the tube wall.The results verify the feasibility of the underwater ejection scheme with flexible piston rod,which provides the design basis for the further development of ejection device.

Key words: unmanned underwater vehicle, torpedo, water drive, flexible piston rod, interior trajectory modeling

CLC Number:

TJ63+5

DING Yanchao, HE Zhenmin, ZHANG Zhe, HAN Wenji, WU Wenting. Interior Trajectory Characteristics of Underwater Ejection Using a Flexible Piston Rod Driven by Water Pressure[J]. Acta Armamentarii, 2025, 46(3): 240087-.

Figures/Tables 30

Fig.1 The working principle diagram of ejection device

Fig.2 Schematic diagram of throttle hole buffering

Fig.3 Schematic diagram of water flow in piston cylinder

Fig.4 Schematic diagram of forces on a torpedo

Fig.5 Schematic diagram of data exchange

Table 1 The parameters of ejection device

参数	原理试验数值	水下弹射仿真数值
L/m	2.5	2.5
S₁/cm²	50.3	50.3
S₂/cm²	50.3	50.3
S₃/cm²	39.3	32.2 46.4 63.1
t/s	0.2	0.2

Table 2 Initial values of input variables

参数	原理试验数值	水下弹射仿真数值
p_a、p₁、p₂/MPa	0.22	1.1 3.1 6.1
p₃/MPa	0.1	0.1
Δ₁/cm³	0	0
Δ₂/cm³	12566	12566
dt/s	0.15	0.15

Fig.6 Pressure p2 in reverse cavity of piston cylinder in different drainage hole schemes

Fig.7 Velocity vw of water flow in different drainage hole schemes

Fig.8 Acceleration ap of piston in different drainage hole schemes

Fig.9 Velocity vp of piston in different drainage hole schemes

Fig.10 Displacement xp of piston in different drainage hole schemes

Fig.11 Velocity vp of piston under different ambient pressures

Fig.12 Displacement xp of piston under different ambient pressures

Fig.13 Velocity vt curves of torpedo under different ambient pressures

Fig.14 The rate of pitch angle ω of torpedo under different ambient pressures

Fig.15 Displacement ya of torpedo tail under different ambient pressures

Fig.16 Schematic diagram of ejection device

Fig.17 Schematic diagram of principle experiment in high pressure water tank laboratory

Fig.18 The picture of principle test ejection device

Fig.19 Pressure curve of piston cylinder

Fig.20 Acceleration at of torpedo

Fig.21 Velocity vt of torpedo

Fig.22 Displacement curves

Fig.23 Acceleration at of torpedo in different ejection schemes

Fig.24 Velocity vt of torpedo in different ejection schemes

Fig.25 Pressure curves of piston cylinder in different ejection schemes

Fig.26 Pressure curves of piston cylinders with different working media

Fig.27 Acceleration at of torpedos with different working media

Fig.28 Velocity vt of torpedos with different working media

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