Simulation of the dynamic process of underwater wall attached launch muzzles

DOI:	10.11809/bqzbgcxb2023.06.019
Keywords:	underwater gun; supercavitating projectile; Fluent; initial flow field; muzzle flow field; firing close to the wall
Abstract:	Based on the computational fluid dynamics software Fluent, by using dynamic mesh technology, this paper establishes a two dimensional plane model for the fully submerged launch of a 14.5 mm underwater gun close to a wall with a distance of 30 mm, 50 mm, 70 mm and 100 mm respectively, and performs the simulation calculation. The calculation results show that, when the jet velocity of the water column before the bullet reaches 250 m/s, cavitation begins to appear on both sides of the water jet, and the wall surface has an inhibitory effect on the cavitation of the muzzle. When the distance close to the wall d=50 mm, it is difficult to form a complete water vapor phase in the cavitation area near the wall. When the distance close to the wall increases to 100 mm, the influence of the wall surface on the cavitation area basically disappears. With the decrease of the distance close to the wall, the radial expansion velocity of the boundary of the Taylor cavity on the side without the wall constraint gradually increases. In the asymmetric pressure field, the radial displacement of the center of mass of the projectile increases with the decrease of the distance close to the wall.
Published:	2023-06-28
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