Numerical simulation on the deflection behavior of large caliber conical nose projectile at oblique high-speed water entry

CHEN Jianliang; YANG Pu; LI Jicheng; CHEN Gang; DENG Hongjian; FAN Zhigeng

doi:10.11883/bzycj-2023-0398

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CHEN Jianliang, YANG Pu, LI Jicheng, CHEN Gang, DENG Hongjian, FAN Zhigeng. Numerical simulation on the deflection behavior of large caliber conical nose projectile at oblique high-speed water entry[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0398

Citation:

CHEN Jianliang, YANG Pu, LI Jicheng, CHEN Gang, DENG Hongjian, FAN Zhigeng. Numerical simulation on the deflection behavior of large caliber conical nose projectile at oblique high-speed water entry[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0398

Citation:

CHEN Jianliang, YANG Pu, LI Jicheng, CHEN Gang, DENG Hongjian, FAN Zhigeng. Numerical simulation on the deflection behavior of large caliber conical nose projectile at oblique high-speed water entry[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0398

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Numerical simulation on the deflection behavior of large caliber conical nose projectile at oblique high-speed water entry

doi: 10.11883/bzycj-2023-0398

CHEN Jianliang^{1, 2
,},
YANG Pu^{1, 2},
LI Jicheng^{1, 2},
CHEN Gang^{1, 2
,
,},
DENG Hongjian^{1, 2},
FAN Zhigeng^{1, 2}

1.
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
2.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621999, Sichuan, China

Received Date: 2023-11-02
Rev Recd Date: 2023-12-26

Available Online: 2024-03-04

Abstract

Abstract

Integrated with a high-speed oblique water entry test of a large caliber conical nose projectile, the deflection behavior of the projectile obliquely entering water was studied based on the arbitrary Lagrange-Euler (ALE) fluid-structure coupling method. Firstly, based on the experiment of projectile impacting on inclined water tank at high speed, the finite element model was established to simulate the corresponding response characteristics, and the rationality of the numerical model and related method was verified. Secondly, the variation of contact force mode as well as load characteristics of the projectile in the condition of water entry at 500 m/s was analyzed, and the corresponding mechanism was discussed. In addition, the influence of water entry angle on the deflection behavior of projectile was also investigated. Related analysis demonstrated that the projectile will deflect upward due to the effect of pitch moment, and the deflection velocity increases first and then decreases gradually during the entry process. The variation trend of deflection degree is different within different entry angle range. When the entry angle is less than 15°, the projectile usually jumps out of the water. When the entry angle locates in the range of 30°–60°, the deflection trend of projectile is almost the same, i.e., the projectile rotates from the initial tilted state to the horizontal state and further the vertical state, and finally it moves downward with its nose opposite the initial water entry direction. When the entry angle increases to 75°, the projectile cannot continue to rotate to a vertical state after it rotates to a horizontal, instead it moves downward in a tilted state with its nose facing upward. Under different water entry angles, the axial force exerted on the projectile is negative, and it makes the projectile velocity decreases continuously; comparatively, the transverse force is positive, and the peak value decreases with increasing the water entry angle. Moreover, the penetration depth of the projectile increases with the increase of entry angle, and it almost shows an exponential relationship.
- large caliber conical nose projectile,
- high-speed oblique water entry,
- contact force mode,
- entry angle

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References(22)

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