Numerical study on the influence of trajectory interference characteristics of multiple projectiles underwater launch

LI Teng; QIU Yang; YAO Weiguang; GUI Yulin; PAN Guang; ZHENG Xiaobo

doi:10.11883/bzycj-2024-0435

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LI Teng, QIU Yang, YAO Weiguang, GUI Yulin, PAN Guang, ZHENG Xiaobo. Numerical study on the influence of trajectory interference characteristics of multiple projectiles underwater launch[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0435

Citation:

LI Teng, QIU Yang, YAO Weiguang, GUI Yulin, PAN Guang, ZHENG Xiaobo. Numerical study on the influence of trajectory interference characteristics of multiple projectiles underwater launch[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0435

Citation:

LI Teng, QIU Yang, YAO Weiguang, GUI Yulin, PAN Guang, ZHENG Xiaobo. Numerical study on the influence of trajectory interference characteristics of multiple projectiles underwater launch[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0435

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Numerical study on the influence of trajectory interference characteristics of multiple projectiles underwater launch

doi: 10.11883/bzycj-2024-0435

LI Teng^{1, 2
,},
QIU Yang¹,
YAO Weiguang¹,
GUI Yulin¹,
PAN Guang²,
ZHENG Xiaobo^{1
,
,}

1.
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China
2.
School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, Shannxi, China

Received Date: 2024-11-05
Rev Recd Date: 2025-04-16

Available Online: 2025-04-18

Abstract

Abstract

During the underwater launch of multiple projectiles, each projectile operates within a highly complex and dynamic flow field, where its trajectory deflection is influenced by a combination of factors. These factors include initial conditions such as the projectile’s velocity and the presence of crossflow, as well as the mutual interference effects among the projectiles. To gain a deeper understanding of the cavitation evolution and trajectory interference characteristics during the underwater launch of multiple projectiles, this study develops a comprehensive numerical simulation model. The model integrates the overlapping grid technique and the finite volume method and is coupled with a six-degree-of-freedom(6-DOF) motion model. Through this model, the influence mechanisms of spatial arrangement, launch velocity, and crossflow on trajectory deflection are systematically analyzed. The results of this study reveal several important findings. First, the spatial arrangement of the projectiles has a relatively minor impact on trajectory deflection. An equilateral triangular configuration is found to be an optimal choice for practical applications, as it maximizes the efficient utilization of the launch space. Second, as the launch velocity increases, the wake interference between projectiles becomes more pronounced. This intensified interference leads to significant disturbances in the flow field and stronger mutual trajectory interference among the projectiles. Third, higher crossflow velocities exacerbate the asymmetric development of cavitation near the projectile shoulders. When the crossflow velocity exceeds 0.75 m/s, it becomes the dominant factor influencing trajectory deflection. These research findings provide a robust theoretical foundation for trajectory prediction and layout optimization in the underwater launch of multiple projectiles.
- multiple projectiles,
- trajectory,
- water exit,
- cavitation flow field

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References(26)

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