Motion Characteristics of High-Speed Supercavitating Projectiles Including Structural Deformation

Chuang Huang, Zhao Liu, Zixian Liu, Changle Hao, Daijin Li and Kai Luo
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Chuang Huang: School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710065, China
Zhao Liu: School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710065, China
Zixian Liu: AVIC Xi’an Automatic Control Research Institute, Xi’an 710065, China
Changle Hao: School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710065, China
Daijin Li: School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710065, China
Kai Luo: School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710065, China

Energies, 2022, vol. 15, issue 5, 1-18

Abstract: High-speed supercavitating projectiles receive tremendous hydrodynamic force when flying underwater in tail-slap mode, and have obvious structural deformation and structural vibration. To study the motion characteristics of high-speed supercavitating projectiles, a bidirectional fluid-structure interaction model was established, and validated by comparing with the existing results. The motion, supercavitation flow field, and structural deformation response process of a supercavitating projectile were numerically investigated under the conditions of initial speed within 800–1600 m/s. It was found that the tail-slap motion of high-speed supercavitating projectiles is correlated with a high-frequency structural vibration. Further, the amplitude of the structural vibration increases with the initial speed. When flying with an initial speed higher than 1200 m/s, supercavitating projectiles encounter a great structural deformation under the action of the huge hydrodynamic load, which exerts a significant influence on the motion characteristic, and even destroys the trajectory stability. Thus, the supercavitating projectile cannot be regarded as a rigid body any more, and the structural response effect must be considered.

Keywords: structural response effect; high-speed supercavitating projectiles; tail-slap motion; motion characteristics; bidirectional fluid-structure interaction; computational fluid dynamic (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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