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.
Highlights
Academic Editors: Ali Turan, Supercavitating projectiles are kinetic energy weapons; they are launched by artillery and fly without any impetus
The alternating hydrodynamic force acting on the supercavitating projectile may result in a significant structural vibration, and even overturns the motion stability
From the fluid-structure interaction (FSI) Results simulation results, the flow parameters, supercavity shape, hydrodynamic force acting on the supercavitating projectile, motion characteristics of the superFrom the FSI simulation results, the flow parameters, supercavity shape, hydrodycavitating deformation response process of the supercavitating namic forceprojectile, acting onand the dynamic supercavitating projectile, motion characteristics of the superprojectile were obtained
Summary
Academic Editors: Ali Turan, Supercavitating projectiles are kinetic energy weapons; they are launched by artillery and fly without any impetus. Using natural supercavitation drag reduction technology, supercavitating projectiles can fly underwater at a very high speed, and become an effective means for large combatant vessel against small underwater threats such as torpedoes, mines, and frogmen [1,2]. To extend the defense range and enhance power, supercavitating projectiles are expected to fly farther underwater and have greater residual kinetic energy at the end of trajectory. As the initial speed increases, the hydrodynamic load on supercavitating projectiles increases in a squared relationship. This causes significant structural deformation and even structural damage [4,5]
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