STUDY OF HIGH SPEED PROJECTILE IMPACTS, LOADS, AND MOTIONS AT WATER ENTRY
GENERAL DYNAMICS SAN DIEGO CA CONVAIR DIV
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An experimental investigation was conducted on high-velocity water entry impacts of 60-degree total apex angle conical-nosed projectiles. Salient results are 1 Projectiles with 1-in. and 2-in. diameter bodies have been fired vertically into water at air Mach numbers ranging from 0.4 to 1.0 vertical velocities from 395 to 1120 fps 2 Specially-developed accelerometer and sub-miniature epoxy-potted FM telemetering instrumentation were employed within the projectile body for the measurement of axial accelerations during water impact 3 Water impact acceleration-time histories were recorded successfully during five tests with velocities ranging from 396 to 838 fps and with the maximum axial accelerations varying from 1530 to 6000 gs. It has been shown that the impact acceleration measurements are in good approximate agreement with the Pierson immersing-wedge theory, but that the experimental measurements fall considerably lower than the Shiffman-Spencer theory and 4 Water impact pressure measurements were obtained in the far field 1.2 feet from the point of impact which, together with theory, permit extrapolation of the experimental data to higher velocities.
- Fluid Mechanics