Development of gas guns combined with a water tank for launching high-velocity projectiles into water obliquely and horizontally

LIU Erwei; XU Shengli; ZHOU Jie; ZUO Jindong

doi:10.11883/bzycj-2020-0207

Volume 42 Issue 1

Jan. 2022

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LIU Erwei, XU Shengli, ZHOU Jie, ZUO Jindong. Development of gas guns combined with a water tank for launching high-velocity projectiles into water obliquely and horizontally[J]. Explosion And Shock Waves, 2022, 42(1): 014101. doi: 10.11883/bzycj-2020-0207

Citation:

LIU Erwei, XU Shengli, ZHOU Jie, ZUO Jindong. Development of gas guns combined with a water tank for launching high-velocity projectiles into water obliquely and horizontally[J]. Explosion And Shock Waves, 2022, 42(1): 014101. doi: 10.11883/bzycj-2020-0207

Citation:

LIU Erwei, XU Shengli, ZHOU Jie, ZUO Jindong. Development of gas guns combined with a water tank for launching high-velocity projectiles into water obliquely and horizontally[J]. Explosion And Shock Waves, 2022, 42(1): 014101. doi: 10.11883/bzycj-2020-0207

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Development of gas guns combined with a water tank for launching high-velocity projectiles into water obliquely and horizontally

doi: 10.11883/bzycj-2020-0207

1.
School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
2.
School of Engineering Science, University of Science and Technology of China, Hefei 230026, Anhui, China

Received Date: 2020-06-22
Rev Recd Date: 2021-12-02

Available Online: 2021-12-10

Publish Date: 2022-01-20

Abstract

Abstract

Gas guns with a water tank assembly, were developed for launching projectiles into water obliquely and horizontally. The burst of gas guns was controlled by the quick valve and the piston valve. The cartridges and models in the one-stage gas gun were directly driven by high-pressure air. The heavy piston in the two-stage gas gun was driven by high-pressure air first, and then compressed the air in the gas-gathered chamber to drive the cartridges and models to the predetermined high-speed. By adjusting the angle between the water tank and the launching tube, the high-speed model can entry into water either obliquely or horizontally. The vertical gas gun with variable launch angles, is capable of launching a projectile with mass ranged from several to hundreds of grams at speed ranged from hundreds to thousands of meters per second. The horizontal gas gun can launch the projectile with mass ranged from several to tens kilograms at speed ranged from several to hundreds of meters per second. In contrast to a powder gas gun using small chamber filled with vitiated gas at high pressure and temperature, these gas guns are distinguished for the large volume air reservoir run at medium even low pressure, and characterized by a wide range of mass and speed of the projectile by adjusting the air pressure, which is close to isentropic expansion. Based on light reflection and beam on-off methodology, high-speed photography and shadowgraphy measurements, the results including the piston velocity in compression tube, the pressure time history at the end of the compression tube and the shadowgraph images of water entry and underwater navigation, were obtained. The results show that the piston velocities are in good agreement with the theoretical calculation before the diaphragm bursting, after which the difference increases. The high-speed shadowgraphs in the vertical gas gun clearly indicate the shock waves in the air and water generated by the oblique impacting of the projectile into the water, as well as the reflection of the shock wave on the gas-water interface, where the formation of cavitation, the break and splash of the interface are observed either. A gas bubble induced by water and enrolled air envelopes, which is extracted from the images in the horizontal gas gun, clearly indicates the fluctuation or instability along the gas-water interface close to the bubble rear. Compared with the numerical results by the commercial software fluent, the obtained bubble lineament basically coincides except at rear due to strongly wake turbulence attached to the projectile. In contrast to the water tunnel, the test rigs in this paper are superior in wide range of mass and speed, as well as reproducing real conditions such as impacting phenomenon and dynamic cavitation during the process of high-speed water entry.
- one and two-stage gas gun,
- flow field visualization,
- underwater navigation,
- high-speed water entry

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References(19)

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