Motion Characteristics of High-Speed Supercavitating Projectiles Including Structural Deformation

• Published in: Energies (Basel) 2022-03, Vol.15 (5), p.1933
• Main Authors: Huang, Chuang, Liu, Zhao, Liu, Zixian, Hao, Changle, Li, Daijin, Luo, Kai
• Format: Article
• Language: English
• Subjects: bidirectional fluid-structure interaction; computational fluid dynamic; Deformation; Fluid-structure interaction; High speed; high-speed supercavitating projectiles; Interaction models; motion characteristics; Motion stability; Numerical analysis; Projectiles; Rigid structures; Structural response; structural response effect; Structural vibration; Supercavitating flow; tail-slap motion; Underwater; Vibration; Viscosity
• ISSN: 1996-1073; 1996-1073
• DOI: 10.3390/en15051933

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.